sailboat fresh water maker

5 Best Watermakers for Sailboats

Last Updated by

Daniel Wade

June 15, 2022

With the right Watermaker, the ocean becomes an almost immeasurable supply of fresh and clean drinking water to keep you hydrated during your offshore sailing adventures.

Many sailors do spend a lot of their time and money on various parts of the sailboat including the sails, engine, electronics, and generators especially when preparing for long-distance voyages.

While there's absolutely nothing wrong with this, they often overlook one crucial part of general human survival: having an ample supply of fresh drinking water.

Whether you have freshwater drinking tanks on your sailboat or planning to cruise in areas where you can easily access clean drinking water, the hassle involved in having to come to the dock to fill the water tanks can be quite overwhelming.

This is exactly why you need to find the best watermakers for sailboats.

Like many other nautical technologies, watermakers have significantly advanced in the last few decades to become very efficient and more reliable. They're no longer a luxury on your sailboat but a necessity. Better still, watermakers have become relatively affordable and are meant to keep you hydrated as you explore areas that do not have clean and fresh drinking water.

In this article, we'll take a look at how watermaker systems work, highlight its benefits, and highlight the best sailboat watermakers on the market right now. At the end of this read, you should be able to choose the best watermaker for your sailboat.

Table of contents

Benefits of Having a Watermaker on Your Sailboat

The freedom and security that come with having full water tanks on your sailboat are of immense importance, especially if you're cruising in an area where fresh drinking water is hard to come by and quite expensive when you do. As such, having a watermaker aboard your sailboat is no longer a luxury like it used to be in the past. With a steady supply of fresh and clean water, your life on the sailboat will be a lot better. This is because you'll have enough clean water to drink, cook, wash, and shower, which is beneficial if you want to enjoy your sailing adventures.

Honestly speaking, many sailors do not actually need a watermaker. Well, if you're planning to sail just near the shores, then there's a chance that you can easily access fresh and clean water by the dock. But this can be limiting if you've been dreaming of going off the grid and sailing to some exotic and unknown places in the world.

With that in mind, a watermaker makes a lot of sense to most sailors. You won't have to worry about having to carry aboard gallons of fresh water for cooking and drinking during your voyage. You won't have to treat freshwater as a precious commodity that must last until you can refill at the next port. With a watermaker, you can simply go ocean crossing without worrying about running out of water.

A watermaker allows you to have a steady supply of fresh and clean water to keep everybody well-hydrated and healthy. You can clean the water anytime you feel like and all you have to do is replace the filter once in a while and you'll be good to go. In essence, a watermaker is probably one of the most important equipment to have aboard your sailboat, so installing it is of great importance if you're a serious sailor.

The Basics of Modern Marine Watermakers

Modern marine watermakers essentially follow the principle of reverse-osmosis to produce pure, drinking water from seawater. During this process and through very high pressure, seawater is forced through a semipermeable membrane that only allows freshwater molecules to pass through it but not salt, bacteria, or any other organic material. The newly made pure, drinking water is then piped to the sailboat's water tanks while the leftover (brine) is discharged overboard.

Even though marine watermakers may differ in the type of pump that's employed and how it is driven, this is one of the most important features in every watermaker. In most cases, water can be electrically pumped or powered directly off the boat's engine. If you have an AC generator or alternator on your boat, it would make much sense to use the AC output to drive the watermaker directly. You can also choose the DC-powered models if you rely on renewable energy from solar or wind. Alternatively, you can still go for AC-powered watermakers but you'll have to buy an inverter.

All in all, DC-powered watermakers are more efficient since they integrate a power-saving energy recovery system (ERS). You must, however, keep in mind that your energy consumption levels might be quite high if you're sailing in colder and saltier areas. This is because the water purification process might be a bit slower in such areas. As such, you should consider investing in a more high-powered watermaker system if you will be sailing in colder and saltier areas than if you're planning to sail more in warm and less salty areas.

As far as an engine-driven watermaker is concerned, you should mount the high-pressure pump on the engine so that it can be belt-driven using an automatic clutch. An engine-driven watermaker should be your first option if you want large quantities of fresh drinking water. This is more productive than AC or DC-powered watermakers. Even with a relatively small engine, this setup has an automatic regulator that constantly pumps the water. With that in mind, engine-driven watermakers are ideal if you want to reduce your energy consumption. To put it into perspective, an engine-driven watermaker can lower energy consumption by an enormous 80%, especially when compared with conventional AC or DC-powered watermaker systems.

How to Choose the Best Watermaker for Your Sailboat

There are many factors to consider when looking for the best watermakers for your sailboat. Here are the most important things to consider.

Your Freshwater Needs

One of the most important things to consider before spending your money on a watermaker is your freshwater needs. What quantity would be enough to keep you going on your sailing adventure? While the quantity might differ from one sailor to the other or from one boat to the other, you should consider the number of gallons that a particular watermaker can produce per day. This will help you in choosing the ideal watermaker; a model that will ensure that you never run out of water. Do not underestimate your water needs, especially if you're planning to sail with your children or if you're planning to stay on the boat for an extended period of time.

Do you have enough space on your vessel to accommodate the type of watermaker you're looking to buy? While most watermakers are designed to fit in the smallest of space, you should consider the actual size of the watermaker and find out whether you have enough space on your vessel to fix it.

Watermakers can run on electricity, renewable energy such as wind and solar (if you have them on your vessel), or both. When looking for the perfect watermaker, you should consider how to power it and whether or not the watermaker has low-energy consumption, which is definitely a great feature. Again, there are also engine-driven watermakers, so it's important to know exactly what you're going for.

Maintenance

Watermakers have a reputation for being difficult to maintain. Fortunately, the equipment and components have improved in the last few years so you should go for a model that's easy to maintain. You should use the watermaker in water bodies that look good, You should avoid using the watermaker in dirty harbors as you may have to change the filters every so often or even damage your watermaker altogether.

Best Watermakers for Sailboats

Let's take a look at the best watermakers available on the market right now.

The Ultra Whisper

Engineered by limited electrical options that can run on either DC or AC, THE Ultra Whisper by Sea Recovery is one of the best watermakers currently available on the market. In addition to being very quiet, this watermaker features an automatic operation that requires very minimal operator adjustment.

This watermaker is ideal for small powerboats and sailboats since it can serve as an efficient water supply. This model boasts about a 75% reduction in power consumption, especially when compared to other models.

• ‍ Smooth and quiet water production
• Can produce up to 2,280 liters per day
• Ideal for small boats
• It is energy efficient
• ‍ It might not be perfect for large boats

Echotec Watermaker

If you want a watermaker model that can produce 60 liters per hour flawlessly and with no maintenance apart from changing the filters, look no further than the Echotec Watermaker. This model is designed for ultra-reliable performance and easy customer installation.

This watermaker is made from high-quality components that can withstand the continuous harsh marine environment, making it one of the most durable watermakers on the market. This is essentially a series of modular watermakers ranging from 12-volt to 24-volt DC-powered models. They bring forth energy efficiency, a computerized energy recovery system, and ultimate reliability to ensure that you never run out of fresh drinking water while out there on the sea.

• ‍ Energy efficient
• Cost-effective
• ‍ Comes with a very low speed
• Not ideal for large boats

Spectra Katadyn PowerSurvivor

As a compact and energy-efficient watermaker, the Spectra Katadyn PowerSurvivor is arguably the most affordable watermaker currently available on the market. We are talking about a model that only requires 4 amps to desalinate water for your sailboat. It can produce 1.5 gallons of fresh drinking water per hour, which is an excellent return for a watermaker of its size.

It is also one of the most portable watermakers around. You can choose to either install it permanently or temporarily in case you want to take it somewhere else. This portability is also essential if you're looking for a space-saving model that can fit in the smallest of compartments. Its simple but rugged design is essential in ensuring that it can perform at its best even in harsh marine conditions. In terms of its power capabilities, this is the only model on the market that will convert to a hand-operated system or manual power if there's a power shortage.

• ‍ Portable and lightweight
• Rugged design to withstand harsh marine environments
• Efficient and reliable
• Can revert to manual power if there's a power shortage
• Perfect for off-grid sailing
• ‍ Gasoline or diesel can easily damage the semi-permeable membrane

Village Marine - Little Wonder Series

Whether you're looking for a watermaker for your small sailboat or looking for a watermaker that can efficiently serve those huge yachts, the Village Marine Little Wonder Series provides everything. This model is meant for experienced sailors who are looking for various capacity options. This watermaker weighs just about 69 pounds but can produce nearly 180 gallons of fresh drinking water each day.

Designed with a low RPM high-pressure pump, this model remains one of the most efficient and economical watermakers on the market. That's not all; this watermaker is designed with corrosion-resistant features and is one of the most serviceable watermakers in the game. It is reliable, quiet, and portable; all factors that make a watermaker great.

• ‍ Easy to operate
• Corrosion-resistant
• Easy to maintain
• Quiet and versatile
• ‍ It doesn't have automatic adjustment controls

Ventura 150 Watermaker

This is one of the most versatile watermakers on the market. It can use both electricity and renewable energy. This model is engineered to be lightweight and energy-efficient and its compact and modular design makes it a great option if you're looking for a watermaker that's easy to use and install in confined spaces.

The Ventura 150 watermaker is highly efficient as it can produce over 6 gallons of water an hour, which makes it quite perfect for small vessels. This sailboat watermaker features a controller that allows you to operate and monitor the device remotely. It also has the auto store button that will automatically flash the system after every five days.

This watermaker is quiet and surprisingly compact despite its ability to produce about 150 gallons of water per day. It also gives you the option of going for the automated manual or manual model.

• ‍ Very versatile
• Can use both electricity and renewable energy power
• It is smooth and quiet
• It is compact and lightweight
• ‍ The manual model has analog controls

To this end, it's easy to see that having an ideal watermaker aboard your vessel is one of the first crucial steps towards being self-sufficient and sustainable. With a watermaker, you'll be able to access fresh drinking water at all times when sailing even in far-flung places. Most of these models are well-constructed and incorporate some of the best technologies that make them efficient, reliable, and easy to install, use, and maintain.

So when it comes to choosing the best watermaker for your sailboat, it may all come down to what is ideal for you in terms of energy consumption, efficiency, the quantity of water produced, among many other things. With an ideal watermaker, you can remain off the grid for as long as you want without ever worrying about running out of water and this is of great importance in enjoying your sailing adventures.

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I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

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Home » Blog » Gear » Watermakers: a guide to marine desalinators and making water on a boat

Watermakers: a guide to marine desalinators and making water on a boat

By Author Fiona McGlynn

Posted on Last updated: March 23, 2022

There’s something magical about a watermaker—at least that’s how I felt after we installed one on our boat. That may sound overblown, but think about it: watermakers transform salt water into fresh water, providing a near-endless supply of potable water for drinking, bathing, and cleaning! THAT my friends is an amazing piece of technology!

(If you don’t share my enthusiasm, try going without a shower for a few days and you’ll begin to see my point).

Having experienced living on a boat and cruising, both with and without a marine desalinator, I can attest that it’s a game-changing piece of gear. However, you definitely don’t need one to go cruising. There are plenty of low-tech ways to collect and make water on a boat.

Marine desalinators do offer some major benefits: there’s more water for showers, it’s easier to travel farther afield, you can spend more time in a remote location. However, these benefits have to be weighed against the drawbacks: namely a hefty price tag and ongoing maintenance.

Deciding whether a watermaker is right for you will come down to the type of cruising you’re doing, how much water you need, and your budget. Read on to learn about the pros and cons, costs, and key features of marine watermakers.

Table of contents

• 1 How does a watermaker work?
• 2.1 Benefits
• 2.2 Drawbacks
• 3.1 Powered or handpump
• 3.2 Electric or engine drive
• 3.3 Energy recovery watermaker
• 3.4 Modular, self-contained, and portable watermakers
• 3.5 Automatic flushing systems
• 3.6 Automatic Pressure Regulation and adjustable pump speed
• 3.7 Remote control panels
• 4 Top watermaker brands

How does a watermaker work?

A watermaker on a yacht converts seawater into fresh water through a process known as reverse osmosis (RO). A high-pressure pump pushes seawater through a semi-permeable membrane that filters out salt, organics, and bacteria. The fresh water is pumped into your water tanks while the remaining brine bi-product is discharged over the side of the boat, back into the ocean.

Marine watermakers: the benefits and drawbacks

Less water rationing.

When we started our 13,000 mile trip across the Pacific, we didn’t have a watermaker. We were on a tight budget and decided to prioritize other pieces of equipment like a life raft and wind vane.

As a result, we became experts in conserving water on a boat . We would carefully ration out water for washing dishes, taking showers, and even brushing our teeth!

After getting a watermaker we became far less meiserly because we knew we could always make more water if we needed to. It was a relief to not be constantly thinking about how much water we were using over the course of a day.

That being said, we couldn’t relax completely. We had to keep our tanks topped up, so as not to run the pump dry. We also always carried potable water in reserve, in case our watermaker broke in the middle of a long passage.

More luxuries

Can’t live without a proper shower? A boat water maker can make water-intensive luxuries like freshwater deck washdown, freshwater flushing heads, laundry, daily showers, and even baths, a possibility.

As great as this sounds in theory, we were surprised to find that we didn’t indulge in more showers after we got the watermaker.

We continued to use a hand pump pesticide sprayer to shower on deck despite having a watermaker and shower below. While some of this came down to habit, we also disliked running our engine (and consuming diesel) just to run the watermaker.

No hauling water

For us, this was by far the greatest benefit of having a watermaker!

While cruising in the US and Canada, we could refill our water tanks at a dock or marina. This was a minor hassle because it involved pulling up the anchor and docking the boat.

In Mexico, it was more challenging to get water. We would fill 5-gallon jugs at the local water purification plant in town and wheel them back to our boat on a collapsible dolly.

It often took a couple of trips with the dolly and dinghy to fill our water tanks. Oh, and we broke our dolly, twice!

We realized that if we wanted to spend more time exploring, and less time hauling water, we would have to invest in a watermaker. When we reached La Paz, Mexico we bought a refurbished watermaker, and we were so glad we did!

Our sailboat water maker gave us the gift of time, especially in places like Mexico and the South Pacific, where there were limited opportunities to fill water tanks up at the docks. It also saved us paying docking and water fees.

We estimate that our boat water maker saved us anywhere from four to six hours every week, time that we could spend exploring the wonderful places we were visiting.

A clean, safe water source

In places where the drinking water may be suspect, a boat water maker can be a reliable source of safe drinking water (assuming it’s in good working condition!).

More time in remote locations

A watermaker is a great tool if you’re drawn to remote locations where you might be the only boat in the anchorage.

It wasn’t until we reached Los Frailes, a secluded village on the Baja, that we really began to think about buying a watermaker.

There we were in an idyllic anchorage, surrounded by spectacular hiking and fishing. There was only one problem—every two days we had to walk 10 miles into town with our water jugs and hope that some kind samaritan would give us a lift back to our boat.

Before having a watermaker, we’d often leave a place we loved just because we needed to fill up our tanks. With a watermaker, we were more self-sufficient and could stay an extra few days, or as long as we wanted!

The number one drawback is the cost. We were able to find a refurbished water desalinator for $3,000, which was a great deal but also a considerable slice out of our cruising kitty.

How much does a watermaker cost?

Powered desalination systems for your average recreational cruising boat range from around 3,500 USD to 11,000 USD, with the more expensive options offering higher production (gallons of fresh water per hour).

Ongoing maintenance

Watermakers are yet another piece of boat equipment that needs to be maintained.

The majority of watermaker problems are caused by not using it enough or not using it properly.

If a watermaker is not used for a few weeks, the planktonic organisms in the seawater will die, rot, and clog the membrane and filters. This can eventually damage the reverse osmosis membrane in the watermaker.

For this reason, boat water makers should be used frequently and regularly flushed with fresh water.

Watermaker flushing

Check your manufacturer’s instructions on how to flush.

Rainman recommends flushing the seawater out of the system with fresh water if you are not using the system for more than a day or two. After another week, you need to freshwater flush the system again or pickle it for long-term storage.

Of course, it’s easy to forget, so we made it a rule to freshwater flush our watermaker after every use.

This is one good reason to choose a watermaker with an output that will meet your water consumption needs but not exceed them. If you’re using it every second day, you won’t have to try and remember whether you’ve flushed it or not.

Flushing a watermaker is relatively simple but it does involve a bit of work. We used a system with buckets of fresh water to flush our system and it generally took about 5 minutes.

You can also buy systems that automatically flush your watermaker at pre-determined times—even when you’re away from the boat (more on autoflush systems below).

Whatever you do, don’t use chlorinated water to flush as it will destroy reverse osmosis membranes. It’s possible to buy a carbon filter to remove chlorine from water sources at the dock.

Pickling a watermaker

If you don’t plan on using your watermaker for a while it needs to be “pickled” with a special biocide to prevent growth and buildup which could render your reverse osmosis membrane totally useless.

A watermaker should also be pickled every so often to chemically cleanse the membrane.

In addition to flushing and pickling, you will also need to clean out and replace the raw water pre-filters.

Operating costs

When properly cared for, a membrane should last five to ten years. If you don’t properly flush or pickle your watermaker, it can be a lot sooner and membranes aren’t cheap, generally costing in the range of 200-700 USD.

You’ll also need to purchase pre-filters and pickling solution, which are generally quite affordable. It’s also a good idea to carry spare parts

Power consumption

Watermakers can be real power hogs. When Practical Sailor tested a dozen DC watermakers they found they could draw anywhere from 12 to 48 watts per gallon, a huge range in efficiency!

According to Practical Sailor, “for maximum efficiency none of the systems drawing 15 amps or more should be operated without running the engine at the same time.”

We had to run our engine for hours to fill our tanks, which was annoying (and loud) when we were hanging out at anchor and also used up another finite resource—diesel fuel.

In our view, this was the single largest drawback to having a watermaker aboard.

Keep in mind that your power supply will determine what type of watermaker you buy. You may need to upgrade your electrical panels, get a generator or high-powered alternator, add solar panels, or increase battery capacity to supply the demand.

You can’t make water everywhere

While watermakers offer great flexibility and freedom, you can’t just make water in any old spot. If you make water in a polluted marina or anchorage, you’ll risk clogging up your filter. Most cruisers will head out to open water to ensure the saltwater they’re using is as clean as possible.

Key features to look for

Powered or handpump, handpump watermakers.

Handpump watermakers tend to be small and portable, the perfect thing to keep in your ditch bag in the event of an emergency. They’re less expensive than powered watermakers and produce far less water, usually around one gallon per hour.

Though I do know cruisers who have used a handpump watermaker for everyday use, they typically tend to be kept aboard for survival situations.

Powered watermakers

Powered watermakers run off your electrical supply or engine and can produce tens of gallons of water per hour. They tend to be a lot more expensive, but they’re productive enough to replenish your tanks.

Electric or engine drive

Powered watermakers can be electrically driven, by AC or DC, or run off the boat engine.

AC watermakers

AC models can produce in the range of 20-60 gph and are ideal for cruisers with an AC generator or alternator on board. They can also be used on boats with ample solar or wind sources and an inverter.

DC watermakers

DC watermaker systems typically produce in the range of 10-30 gph and are ideal for boats with solar power or 12V battery power.

Engine-driven watermakers

On an engine-driven watermaker, the high-pressure pump is belt-driven. These can produce a considerable amount of water, even on small engines. For instance, engine-driven units produce between 20-60gph, twice what a DC unit can produce.

Energy recovery watermaker

DC watermakers have become more efficient in recent years thanks to energy recovery systems (ERS). When the water leaves the watermaker it is still under pressure. ERS uses a set of valves to make use of this excess pressure to help drive the pump, which can reduce energy consumption by as much as 80 percent.

Modular, self-contained, and portable watermakers

Watermakers can be bought as modular, self-contained, and portable units. Choosing the right one may depend on your boat size and layout and whether you’re comfortable installing the watermaker yourself.

Modular units

Modular units come as several separate components that you can mount and connect yourself. This obviously offers a lot more flexibility and is particularly useful on smaller vessels where you may not have a lot of space. The downside is that these systems will take longer to install.

Self-contained units

Self-contained units arrive pre-assembled. While easier to install, they’re often bulkier and best suited to a bigger cruising sailboat with a large engine room.

Portable watermakers

Portable watermaker systems, like the Rainman watermakers, are entirely self-contained. Their compact design makes them easy to move and stow and you can completely avoid a permanent installation.

Simply put the intake and brine discharge hoses overboard, the freshwater hose in your water tank and you’ll be making water in no time.

If you race, have multiple boats, or plan on selling your boat, a portable watermaker is a great option because it can be easily moved from boat to boat.

If we were to buy another watermaker, we would probably opt for a portable one.

Automatic flushing systems

Automatic flushing systems use your boat’s freshwater supply to flush the watermaker for several minutes every few days. These systems require additional components (e.g., a timer, carbon filters, and a motorized valve) and installation but they take a lot of the maintenance out of having a watermaker onboard.

Automatic Pressure Regulation and adjustable pump speed

Your watermaker’s efficiency will be affected by the temperature and salinity of the water you’re cruising in. Cold and highly saline waters (e.g., in the high latitudes) will be more work for your watermaker, so it will take longer to purify.

Some units feature Automatic Pressure Regulation (APR) and adjustable pump speed which can help compensate for fluctuations in water temperature and salinity.

Remote control panels

Some watermakers have the option of a control panel which allows for easier access and remote control. Control panels tend to have a fairly simple interface with just a few gauges but may include a salinity sensor—so you can keep tabs on water quality—and auto-flush integration—so you can flush your watermaker with the flip of a switch.

Top watermaker brands

If you’re considering buying a watermaker for a boat, here are some of the top brands to consider.

• Cruise RO Watermaker
• Echotec watermakers
• Horizon Reverse Osmosis (HRO)
• Sea Recovery watermakers
• Schenker watermakers
• Spectra watermakers

Fiona McGlynn is an award-winning boating writer who created Waterborne as a place to learn about living aboard and traveling the world by sailboat. She has written for boating magazines including BoatUS, SAIL, Cruising World, and Good Old Boat. She’s also a contributing editor at Good Old Boat and BoatUS Magazine. In 2017, Fiona and her husband completed a 3-year, 13,000-mile voyage from Vancouver to Mexico to Australia on their 35-foot sailboat.

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Do You Need a Watermaker for Your Sailboat?

• By Jen Brett
• Updated: October 2, 2019

I remember, in the not too distant past, when having a watermaker aboard a cruising boat seemed to be the ultimate luxury. Plenty of sailors considered them too expensive and complicated. Fortunately times have changed. With improved technology and a range of price points on the market, now even average cruising boats of modest means carry a reverse-osmosis system. And really, is there anything that feels better after a day spent sailing and swimming than a hot shower? The freedom and security that come with full water tanks are also a nice bonus, particularly if you’re cruising in an area where fresh water is difficult to come by and pricey when you do.

Choosing a Watermaker

As with any major system, there are many factors to consider when you choose a watermaker. You’ll need to figure out your freshwater needs, the space you have available for the system and how you’re going to power it . Generally speaking, in a reverse-osmosis desalination system the raw water is run through a series of pre-filters, and then a high-pressure pump moves the water through one or more membrane housings. The wastewater, or brine, is released overboard and the product water goes into your water tanks.

Since all of the watermakers that are currently available for cruising sailboats use this process for desalination, the major differences between the systems are how you power the high-pressure pump and the user interface. Powering options include 120/220-volt AC, 12- or 24-volt DC and engine/belt driven. All have their pros and cons.

“The first question I ask a potential customer is ‘Will your boat have a ship’s generator?’” said Rich Boren of Cruise RO Water. “If they plan to have a generator, then the decision to go with a 120-volt high-output watermaker seems natural. While running the generator for battery charging and other loads two to three times per week, they can keep their water tanks full without having to make generator runs just to make water.”

A 12-volt system, such as the Spectra Catalina 300 Mk II or the Horizon Reverse Osmosis Seafari Quest, makes a lot of sense for smaller cruising boats since they don’t need a generator to run and have fairly miserly power consumption. On a breezy, sunny day, a solar panel and/or a wind generator will likely keep up with the demand. “The only difference between 12-volt DC low-output and 120-volt AC high-output watermakers is how the high-pressure pump brings seawater up to the 800 psi needed to drive fresh water through the reverse-osmosis membrane,” Boren said. “The membrane and support equipment, like pre-filtering and plumbing, are the same.”

These systems typically produce anywhere from about 6 to 16 gallons per hour, and some units can do so for about a 1-amp-per-gallon power draw.

“Many smaller sailboats, under 45 feet or so, often utilize solar panels,” said Berkeley Andrews of Parker Hannifin, which produces Sea Recovery, Horizon Reverse Osmosis and Village Marine watermaker systems. “Their entire electrical backbone consists of 12-volt or 24-volt. So they must have a watermaker that can operate on low voltage. These customers have limited amp hours on their batteries, so all of their equipment must be suited to handling this.”

In choosing a watermaker, Bill Edinger, owner of Spectra Watermakers, said to be realistic about water needs. “When helping customers decide which system is right for them, first we like to determine their approximate water usage with questions like ‘How many people are aboard normally? Are you going to be living on the boat full time? Do you have a washing machine? Any children? Are you going to be cruising full time or leaving the boat for extended periods?”

A common error people make is choosing a watermaker that is too small for their needs. “The most common mistake I see cruisers making in their watermaker purchase decision is underestimating how much water it will take them to cruise comfortably,” Boren says. “I’m not talking about the minimal amount of water it takes for the crew to stay alive, because there is a big difference between staying alive and comfort. Selecting a watermaker that will only meet their minimal drinking-water needs but not keep up with the comfort needs of the crew can lead to crew tensions and feeling like camping rather than cruising.”

Remember that “watermakers are rated in gallons of production in a 24-hour period,” Edinger said. “So a 300-gallon-per-day watermaker system sounds like a lot of water. The important thing is that it produces about 12 gallons per hour. Normally a system like this will be run three to four hours per day if power is not a critical issue, in this case producing 36 to 48 gallons of water. It’s better for a system to run for a few hours every few days than an hour every day.”

Watermakers for Small Boats

If space is at a premium, consider purchasing a modular system instead of an enclosed one. In a modular system, the components, such as the membranes and filters, can be mounted separately. Another power source for the high-pressure pump is the boat’s diesel engine. In these engine-driven setups , the pump and an additional pulley are mounted on a custom bracket next to the engine. The watermaker can then be run while motoring or using the engine to charge the batteries.

While engine-driven watermakers can produce a large amount of water, 20 or more gallons an hour on average, the downside is that the installation can be more complex than for other systems. “Unlike the 12-volt DC or 120-volt AC watermakers, where you simply bolt the high-pressure pump down and then run the wires and plumbing hoses, the hardest installation aspect of an engine-driven watermaker is finding space. Some boats simply have no room in the engine compartment to mount the 5-pound pump with a 7-inch pulley on the engine while still leaving access to other engine parts that need to remain serviceable,” Boren says.

A relative newcomer to the marine market, the portable watermaker is a good solution for cruisers who want the convenience of a watermaker but don’t want to permanently install one. The Rainman is one such system that is available as a self-contained unit driven by a gasoline-powered Honda motor, or as a 115-volt AC-powered unit. “The bulk of our gasoline-powered system customers are sailing yachts between 30 and 50 feet,” said Ron Schroeder of Rainman Desalination. “Our customers seem to prefer to have a simple and somewhat manual system over one that relies on control panels, software and solenoid valves. We are also attractive to those customers who have had bad experiences with the installation process of an installed system.”

The Spectra Passport is another portable system. Edinger said it has already proved popular with offshore race crews and cruisers who need a watermaker for only a limited time.

Maintenance for Watermakers

Watermakers have long had a reputation for being difficult to maintain, but the equipment has improved over the years and overall, routine maintenance isn’t more challenging than with other onboard systems. “The best rule of thumb is to operate the watermaker in water that looks good,” Andrews said. “There are a few factors in the feed-water condition that come into play. Operating a watermaker in dirty harbors will most certainly result in repeated pre-filter changes and a clogged sea strainer. If you have extra filters on board, you can get by, but it’s not recommended. The environment in the open ocean and remote anchorages is much better. Also consider how shallow the water is where you’re anchored. Sometimes there can be a lot of tidal movement, which can kick up fine particulate and sediment. This too can also contribute to more frequent filter changes and even damage other components. A nice option is an automatic freshwater flush, which will rinse the watermaker’s membrane element after use. It helps keep the membrane vessel housing free of any biological growth that could foul the membrane and reduce your ability to produce fresh water.”

Whatever system you choose, with proper use and maintenance you can expect years of service from your watermaker. And plenty of hot showers.

Jen Brett is a CW associate editor. This article first appeared in the February 2015 issue of Cruising World.

Aqua Marine: www.aquamarineinc.net

Blue Water Desalination: www.bluewa​terdesalination.com

Cruise RO: www.cruiserowaterandpower.com

Dometic Marine Sea Xchange: www.do​metic.com

ECHOTec: www.echotecwatermakers.com

FCI Watermakers: www.filtrationconcepts.com

Horizon Reverse Osmosis (HRO): www.hrosystems.com

Katadyn: www.katadyn.com

Rainman: www.rainmandesal.com

Sea Recovery: www.searecovery.com

Schenker Watermakers: www.schenkerwa​termakers.com

SK Watermakers: www.skwatermakers.net

Spectra Watermakers: www.spectrawater​makers.com

Village Marine Tec: www.villagemarine.com

Watermakers Inc.: www.watermakers.com

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3 Best Watermakers for Sailboats (Reviews & Buying Guide)

With a boat surrounded by water, there’s surely no such thing as dehydration out on the sea. Right? Well, not exactly. There’s way too much salt in seawater, and your kidneys would have to work overtime to filter it out. And to do that, they would need more water, which explains why copious amounts of seawater is toxic to humans.

So before you take a sip of that salty brine, why not pass it through a watermaker? The best watermakers for sailboats can take seawater and turn it into potable drinking water, giving you an infinite water supply to keep you hydrated and healthy on extended excursions.

What is a Watermaker?

Otherwise called a ‘desalinator’, a watermaker takes salty seawater and passes it through a process called reverse osmosis. This happens by pushing the water through a semi permeable membrane that allows the water molecules to pass through, but restricts salt, bacteria, and other organic material.

The clean, drinkable water is then passed into a water tank where you can then collect water for use. The remaining brine that was left during filtration is then tossed overboard and discarded. What’s nice is that these machines don’t use any chemicals, so there’s no risk of water contamination or pollution.

Some machines also use a pre or post treatment of the water using things like filters, sand, activated carbon, remineralization, or microfiltration to guarantee safe drinking water.

The Benefits of Watermakers

Modern-day technology has made it possible for manufacturers to develop more compact, efficient watermakers than ever before. This has also significantly driven down prices, making them far more accessible to sailors of all backgrounds.

Today, watermakers are recognized as a sailboat essential, especially for people who frequent the waves for long periods of time. Some of the benefits of these machines include:

Efficient Speed and Fuel Consumption

Yes, you read that right. Consider this - just 1 gallon of water weighs 8.3 pounds. If you’ve got 10 gallons on board, that’s equivalent to 83 pounds. A hundred gallons, and you’ve got an extra 830 pounds on board.

Watermakers allow boat owners to shave down their total weight. This lets you sail more efficiently, allowing faster speeds and lower fuel consumption which is important when you’re planning to sail long distances .

More Floor Area

Without a watermaker, you’d have to find room on board for the several tens or hundreds of gallons you need to bring with you. That also entails finding a place on your boat to store these water vats, which would obviously require significant room.

The watermakers of today are compact and lightweight. They can be either modular or self-contained, giving you different options to match your boat’s floor plan and use as little space as possible.

Safe Sailing

To ensure safe sailing, some studies have found that dehydration might actually be the reason for poor sailing performance. With dehydrated captains feeling lightheaded, achy, tired, and confused, it becomes increasingly likely to run into an accident that could endanger the lives of the people on board.

A watermaker guarantees that there will be fresh potable water at the ready any time you might need it. This doesn’t only curb the chances of dehydration, but also provides a solution for a variety of health conditions including diarrhea and various types of infections.

Extended Sailing Duration

You’ll only be able to sail for as long as your supplies on-board last. As your drinking water runs low, you’ll find yourself having to find the nearest dock to replenish supplies every so often. That’s if there are docks and shores you can access throughout your route. But what if there aren’t any?

Having the necessary equipment on board to extend your supply also means that you won’t have to rely on on-shore facilities to see you through your trip. This gives you more independence and flexibility as well as reducing the need to calculate complicated logistics.

Easier Boat Maintenance

Whether you’re underway or parked at the dock, your watermaker can help streamline boat maintenance by bringing freshwater straight to your vessel. With no need to collect buckets of water to lug back on board for a washdown, you can cut back the time and effort it usually takes to keep your boat clean.

Lots of boat owners even use their watermaker to give their boats a quick clean while they’re out at sea. This helps get rid of accumulated filth and dirt, reducing the need for a tedious deep clean once you get back to the dock.

The 3 Best Watermakers for Sailboats

Back in the day, watermakers were a luxury for the rich and the capable. But today, they’re incredibly affordable and easily accessible. Needless to say, manufacturers have also taken liberties with designing their own machines.

For you, that means an endless list of watermaker bets that could easily screw up your choice. So to help narrow down your options and lead you to the right one, here are our top 3 vetted picks:

1. Katadyn Power Survivor 40E Watermaker Desalinator

Small yet powerful, the Katadyn Power Survivor 40E is a reliable workhorse designed for boats with a small crew population of 2 to 3. This modular unit provides 1.5 gallons of water per hour, and draws only 4 amps from a 12-volt system, making it one of the most energy efficient desalinators out there.

This ‘Energy Recovery’ system works to desalinate seawater at just a fraction of the energy used by other watermakers in the same segment. Thus the device gets its name: Power Survivor.

Silent and lightweight, the machine lets you separate its primary system components so you can install the device seamlessly even in tight or awkward, irregular spaces. Most of its parts also come with a 3-year warranty, giving you that extra peace of mind versus damages and malfunctions.

2. AMPAC USA SeaPro Saltwater Desalination RO Watermaker

Able to produce 100 gallons per day, this watermaker was designed for use on small power boats or sailboats. Its super quiet automatic operation features intuitive controls that let you start and stop the desalination process with the push of a button.

Equipped with a noise pulsation dampener, the sounds produced during operation are negligible at best. This lets you run the machine in the evening to store up clean water for the next day without having to disturb your crew’s peace and quiet.

For boats with limited space, the SeaPro comes in a modular design that’s perfect for tight floor areas. It also comes in a partially mounted compact frame option that lets you fit the desalinator in place with little time and effort.

3. Rainman 12 Volt DC Watermaker

According to Rainman, their 12 Volt DC Watermaker consumes the least energy, able to filter 9 gallons of water per hour. The design touts a two-part system -- one pressure supply unit and another reverse osmosis unit. The former lifts the seawater from the source, while the other performs the desalination process.

What’s unique about Rainman’s watermaker is that the design gives you the option to install the unit directly to your boat, or to keep it handy as a portable watermaker system. This offers immense flexibility, allowing you to set up or take down your system as your situation calls for.

Aside from all of that, the Rainman Desalinator also features a streamlined control panel that makes everything easy to understand and operate at a glance. It also comes equipped with its own LED salinity sensor that tells you when water is good enough to store in your tank.

Choosing the Right Desalinator Watermaker

Not quite sure which one is right for you? Here are a few factors worth taking into consideration when buying a watermaker.

Size and Installation

There are two major options: modular and self-contained. The modular system lets you take the unit apart to install each part at a different part of your boat. This one’s ideal for boats with limited space. The self-contained system has the entire unit built together, which means it has to be installed as one piece.

Gallons Per Hour

How big is your crew? More people means you might need a watermaker with a higher GPH. Smaller machines capable of 1.5 to 2 GPH might be good for crews of 2-3 persons. But larger boats may need several hundreds of GPH to meet all of the crew’s needs.

* See: What size Yacht will Require a Crew?  

Non-Proprietary Parts

You’re going to make part replacements one way or another. See to it that you’re buying a machine that uses non-proprietary parts so you can purchase the necessary replacements anywhere online.

Warranty and Services

In case anything happens to your watermaker, who will be there to help you fix it? Check the warranty coverage and see how long the manufacturer is willing to cover it for damages and malfunction. It’s also important to make sure there’s a nearby service center to cater to your needs in case of damage.

Water You Waiting For?

The best watermakers for sailboats offer to give you a virtually endless supply of clean drinking water when you need it. But there are a ton of choices on the market, so it pays to know what you’re getting before you shell out that cash. Consider our bets for the best desalinators for your sailboat, and keep your crew happy, healthy, and hydrated all along the way.

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Rainman Watermaker Review: Best Sailboat Watermaker

Rainman watermaker review – Rainman naked 12V system (economy)

We’ve done a full review of the Rainman watermaker to help you make an informed decision before you purchase.

What is a watermaker, and why do you need one?

A watermaker is a piece of equipment you can install in your boat, or any off-grid situation, to make crystal-clear drinking water from undrinkable, salty sea water and electricity.

A lot of people want a sailboat so they can travel independently and visit remote locations. A watermaker essentially removes your reliance on shore support for fresh water; drastically increasing your range and independence while making life on board a lot more comfortable to boot.

Watermakers can seem complicated at first, but they’re actually remarkably easy to install and operate – although some more than others!

As an Amazon Associate, we earn from qualifying purchases. We also earn from other affiliate programs. This means we may receive a small commission on products purchased through our links at no extra cost to you.

In this article we’re going to explain why we decided to buy watermaker in the first place; how we went about choosing a make and model; how we installed it in our cruising sailboat, and why we ultimately decided on a Rainman watermaker as the best watermaker for full-time liveaboards on a sailboat.

How does a watermaker work?

How to choose the best sailboat watermaker

Rainman watermaker review

• Power options
• Size and quantity
• Portable or permanent
• Documentation review
• Installation

How does a Rainman watermaker work?

There are a lot of different watermakers to choose between, but they mostly work in a very similar way – they’re basically pressure-washers configured to force salt water through a very fine filter at high pressure.

The filter, or “membrane”, is specially designed to remove all of the things you don’t want in your drinking water – like bacteria, viruses and salt – and only allow clean water to pass. You can drink the resulting water (it’s usually cleaner than tap water on land!), and naturally you can also use it for all your other domestic needs like cooking and cleaning.

The watermaker needs two things to work: a raw water source, like the sea, and a power source, which on a sailboat is typically your batteries and solar panels. You can get watermakers that run directly off the 12VDC / 24VDC your batteries provide, or from your inverter at 120VAC or 240VAC depending on where you are in the world.

You can also run a watermaker from a generator if you have one, which is a popular approach for boats that consume a lot of water (e.g. charters). A select few manufacturers, Rainman being one of them, even offer units that run directly off petrol – a sort of generator-and-watermaker in one. But which is the best watermaker for a cruising sailboat, and how can you choose between them?

Like anything in sailing, the absolute best sailboat watermaker for your boat depends on your needs and intended cruising pattern – but we’re going to talk you through the criteria we decided were the most important, and how that process ultimately led us to buy a Rainman watermaker.

There are a few thought-exercises we ran through before committing, such as “how much water do we currently use”, but also “do we want to use more than that after we install the watermaker”?

We thought about what we really wanted to achieve by installing our Rainman (read more on this in the Rainman watermaker review section!) – were we looking to cover our existing needs and remove our reliance on shore support, or should this represent a significant quality-of-life upgrade at the same time? And having calculated all that, did we have enough power to back it up? Here’s the thought process we went through.

Step 1: calculate your water needs

Before our Rainman watermaker review – how much water do you actually need?

If you’re reading this article, it’s likely that you don’t currently have a watermaker… and if you don’t, it’s equally likely that you have learnt how to eke out the water in your tanks for weeks or even months at a time!

Prior to installing our Rainman, Emily had perfected the art of taking a full shower in less than one litre of water (0.2 gallons). She would draw it into an empty bottle and often come out with water left over! I however am not known for my restraint and delicacy, and as such was relegated to washing in the sea. As a result of her aqueous austerity, Emily also became the underwater ceramics technician onboard Hot Chocolate (i.e. she does all our washing up, because I waste too much water). All of the above came from our tanks, while water for drinking and cooking came from shop-bought bottles.

And for us, that was the #1 thing – we wanted to remove our reliance on bottled water, because it’s horrible for the environment. It’s also super inconvenient – water was the main thing limiting our range and tying us to shore support. Water weighs 1KG per litre (8.3lb / gallon for our friends across the pond). We drink about 3L each, per day, in the heat of the summer; so we’re looking at hauling 42KG of water per week (6.6 stone) from the supermarket just to cover our basic hydration.

We often cooked in bottled water, too, because a lot of countries have heavy metals like lead and mercury in the tap water and you don’t really want your pasta with a side of poison. We calculated that we were actually getting through about 8L per day combined in food and drink alone, which meant hauling 56KG of bottled water a week under the blistering Greek sun (nearly 9 stone)… and no doubt further inflating our water requirements as a result!!

Then there’s the cost of the bottled water, which is small but does add up, and the added inconvenience of having to make regular bin runs to deal with all that plastic (~38 bottles a week). Bear in mind we’re just two people – if you have a family or regular guests, you’ll need to increase those accordingly.

A close second was the ability to shower whenever we wanted (run away to sea, they said… it’ll be romantic, they said…) – so that’s an extra litre every day or two for Emily, and an extra 10 or 20 for me! Truth be told I was quite happy washing in the sea, but it’s very nice to be able to shower in fresh water for special occasions, or be able to rinse equipment in fresh water after it’s been in the sea (e.g. knives, spearguns…).

A stretch-goal was to have enough water on tap (pun intended!) for me to become assistant-second-in-command underwater ceramics technician, and take my fair share of the washing up. We also quite liked the idea of being able to soak lines, clean the salt out of deck hardware, etc. because that’s something we typically only get to do at the start and end of the season, but that was very much viewed as a bonus. Washing the salt off your gear extends its life dramatically which can be a good way to offset the cost of a watermaker if you’re on a budget.

So in summary, we didn’t just want to cover our existing needs – we wanted a little more to play with as well – but we didn’t go as far as treating it like water on land (showers every day, washing clothes, etc). If you have a washing machine, heads that flush with fresh water, teenagers that seem to be waging war on their microbiomes with endless soapy showers… you’ll need to account for those as well.

We estimated our water needs to be:

Drinking: 3L / person / day;

Cooking: 0.5L / person / day;

Personal hygiene: 5L / person / day (e.g. a 10L shower every other day);

General needs, e.g. cleaning: 1.5L / person / day;

Total: approx. 10L / 2.2 gallons per person, per day – meaning 20L total per day.

Step 2: Calculate your power needs (and how you’re going to meet them)

Some brands of watermakers are more efficient than others, but from our own experience and from talking to others, it seems like it takes around 10 Watt-hours to make a litre of water – i.e. about 0.8 Amp-hours from a 12 volt battery. Your mileage will vary based on things like the chemistry of your battery bank, the length of your cable runs, and even the temperature of the sea, but that seems to be a pretty usable yardstick.

Our Rainman watermaker draws about 28A when it’s running, and makes about 34 litres per hour.

Because we’re full-time liveaboards, and working remotely from the boat as well, we already have quite a lot of solar – for a monohull, at least – 360 Watts of mono panels. In theory they should push a good 30 Amps into the batteries in full sun, but in practice it peaks at more like 20A and we make a total of 2.2kWh (2200Wh) in an average day.

We need to make 20L of water per day to keep up; that means we need to allocate 200 Watt-hours from the 2200 we make in a day; i.e., installing our Rainman increased our overall power needs by about 10%.

For comparison, Emily’s laptop draws about 90W an hour and mine draws 120W, so running our Rainman watermaker for an hour a day is about the same as running both our laptops for the same period. A 12V fridge often draws about 3 amps, so about 36W – meaning keeping the fridge running consumes ~850Wh per day, about 4 times more than our watermaker.

Honestly, I imagined it would take a lot more!

Of course, our solar output drops drastically as the Autumn / Fall rolls in, but then so do our water needs… so it’ll be interesting to see how that pans out and whether we’ll need to augment it with fossils fuels, e.g. making water after motoring.

⚡ Note: We have recently upgraded our battery setup to lithium marine batteries from the wonderful BattleBorn. We highly recommend them. You can find out more here . ⚡

See the FAQs at the end for more information.

Step 3: Your cruising pattern

Everyone’s needs are different, and it’s important to factor them in when choosing a watermaker.

One of the main reasons we were drawn to Rainman watermakers is that they use all off-the-shelf, standardised parts. If your Rainman breaks down, it almost doesn’t matter where in the world you are – you’ll likely be able to get standardised spares in the nearest major city. We won’t name any names, but in our quest to identify the best watermaker for our sailboat we discovered that a lot of manufacturers use proprietary parts – ones you can only get from the manufacturer.

We considered this to be extremely undesirable, because

(i) as a cruising sailboat, we want to be able to service our watermaker anywhere in the world

(ii) it can lead to price-gouging, i.e. they can charge whatever they want for spares because you can’t get them anywhere else; and

(iii) – it demonstrates an astonishing lack of awareness on the part of the manufacturer.

Your mileage may vary, but we bought a watermaker for the independence. In fact, we more or less bought the whole boat for independence! Trading a reliance on bottled water for a reliance on obscure, single-source, non-standard parts completely defeats the object.

I have worked in technology all of my life, and for every instance where proprietary parts were truly necessary I could show you 20 more where it was simply an attempt to create a “walled garden” and force you to buy overpriced spares from the manufacturer themselves. In a further handful of cases, it’s to force planned obsolescence and make you throw away an old unit rather than repairing it – which again, is the opposite of how we try to live.

In a non-watermaker example, this is exactly the reason we were forced to replace our windlass in our first season. A simple, $5 helical gear stripped, but because it was proprietary and the manufacturer had long since gone bust, we had no option but to replace it in its entirety – at a cost of about $1500, and all the needless waste accompanying it. We found a machine shop who could copy the stripped gear, but it would have cost nearly $1000 anyway after set-up costs. Not everyone will agree with us but we found that a horrible waste and just an awful design philosophy, and we cursed that manufacturer in a way that would make Blackbeard blush as we hauled up 80M of muddy chain by hand…!

So try to think about your intended cruising patterns and how awkward it would be if you needed spares. If you typically cruise the same grounds, it’s unlikely to affect you that much. If you’re planning an expedition or a circumnavigation however, you’re likely to want to look for manufacturers with a practical design philosophy like Rainman.

Ask around in forums and social media groups and try to gauge what it’s like to deal with the manufacturer. How self-serviceable are the units? How reliable are they? Again, this is something that led us straight to Rainman watermakers. The units have a reputation for being absolutely bulletproof; the pre-sale communication was outstanding, you can get spares anywhere in the world and (nerd alert) the documentation is outstanding too.

Although we eventually went for a fully-installed unit, we also loved the fact you could get a portable version that stows away in a locker or can even been taken in a bail-out situation if you have a 12V source to run it from. You can use the same Rainman watermaker in salt water or brackish (mixed salt and fresh) just by adjusting the pressure level, where some manufacturers require you to purchase a specific unit for each. While we didn’t actually need a lot of these features we appreciated that Rainman was grounded in real-world use cases and had given us that flexibility.

You should also consider if you really need a watermaker. Yes, they are wonderful. Yes, they are basically magic. Yes, it would be nice to be able to stand downwind of your significant other without a peg on your nose. But they also cost about $5,000, and you do have to keep using them every 2-3 days or fill them with pickling solution, else they will foul up and ruin the membranes (Rainman has an “autoflush” unit that makes this a lot easier, see below). If you don’t live aboard full time, you might actually find it an inconvenience!

Rainman Watermaker Review: Rainman 12V Naked

Having considered all of this, let’s talk about the Rainman Naked 12V unit we eventually bought, and why – although the reasons should already be becoming apparent! Here is our honest Rainman watermaker review – warts and all.

Rainman Watermaker Review – The Parts

A Rainman system comes in a few separate parts, which you can configure to suit your needs.  

The pressure supply unit, aka. PSU. This is the pump that draws water from the sea, and then pressurises it ready to be forced through the membrane.

The RO unit. RO stands for reverse osmosis, which is the process a watermaker uses to filter the water. The RO unit therefore is a long tube containing the specialist filters that let it separate clean drinking water from salty sea water. The PSU pressurises sea water and sends it into the RO unit. Out of the other end, you get a small amount of pure, clean, drinking water, and the waste product – brine.

Control panel. Rainman make an optional control panel that lets you start and control the unit remotely from somewhere else in the boat. We installed our Rainmain in a pretty awkward location (in a lazarette under the cockpit), so we were very grateful to be able to mount the control panel somewhere rather more accessible! The control panel has instruments that tell you the pressure the system is operating at, how much water you’re making, and even the quality of the water (via a traffic-light system). You can also use it to control the autoflush function (see below).

Autoflush. Another optional extra, but one we would highly recommend. As detailed earlier in the article, you have to run a watermaker very regularly else marine life will grow on the filters and ruin them. The best antidote is regular, even daily, use, but you can also fill the unit with “pickling” solution that stops the fouling from growing. Generally speaking, that means you run the watermaker 2 – 3 times a week while living aboard, and then pickle it in the off-season when the boat is on the hard standing or home berth. It’s a bit of a pain, but not nearly as annoying as lugging 50KG of water from the nearest supermarket and / or chronic dehydration.

Enter the autoflush. Once a week, or at another interval of your choosing, the autoflush will open a valve and take fresh water from your tanks to flush the membrane and prevent fouling. This extends the life of the membranes significantly and removes human error from the equation. Considering an average sailboat has north of 10,000 moving parts to worry about, we’re big fans of anything that essentially maintains itself! You’ll still need to pickle if you don’t run the unit for 30 days, but if you’re like us and can stretch a tank of water to 14 days or more it’s really convenient.

Rainman Watermaker Review – Your Power Options

When specifying a Rainman system, you have three basic choices to make :

• Power source
• Portable (cased) or permanently installed (naked!)

Power source. When buying a Rainman, you can choose between three different power sources:

• AC electric . An AC electric unit runs off mains power, i.e. 120VAC or 240VAC depending on where you are in the world. That mains power in turn can come from a few sources: if you have an inverter, like many cruising sailboats, you’re already making mains power from the 12VDC / 24VDC supplied by your battery bank. You’ll need an inverter that can supply 1250W, although 1500W is recommended. You can also get mains power from the shore, via your shore power connector – although if you spend a lot of time on shore power you might not need a watermaker at all! If you have a generator on board, there’s a high probability your generator is also outputting mains power as well. AC electric units are much faster than DC, and can produce about 4X as much water per hour – while consuming about 3X the power, so they’re more efficient as well. The best option for boats that meet the power requirements, particularly larger boats, boats with power to spare, boats with high water consumption (e.g. charters).
• DC electric . This is the option we chose, for reasons we’ll explain. DC electric means the unit runs directly off your 12VDC batteries. At the time of writing, I don’t believe Rainman make a 24VDC unit, but 24VDC boats can just use the AC version above via an inverter.

The DC version makes a lot less water per hour than the AC version, because of nerdy reasons related to DC and current. A DC system tops out at 34 litres per hour, where an AC can make up to 140. They’re also somewhat less efficient, although if you’re using an inverter to make AC you should bear in mind your inverter is typically wasting 10 – 20% in the process so the numbers aren’t quite as clear-cut as they seem.

It’s marginally quieter than the AC system, but you need to be able to position it fairly close to your battery bank because again, nerdy reasons to do with DC.

We chose the DC unit because:

• Our inverter is only 1200W, and we didn’t want to have to upgrade it to meet the requirement.
• Our generator is also only 1000W, and we prefer not to use it unless we have to.
• Our water needs are only ~20L a day, so we didn’t really care about making water slowly. One hour a day would easily cover out needs.
• We could easily install the Rainman 3ft from the battery bank, so the cable run wasn’t an issue.
• Petrol. Rainman also make a unit that runs directly off dead dinosaurs. Essentially, it’s a suitcase generator like the popular Honda EU-series with a pressure supply unit bolted on (the genset inside is actually a Honda GXH50 4 stroke). It’s a great idea, particularly if you’re using a Rainman in a non-boat scenario (bugout cabin, disaster relief, etc). You can burn fossil fuels directly to make water without the need for a separate generator. I can definitely see the applications, and although it wasn’t relevant for us, it’s another example of how Rainman’s design philosophy seems firmly grounded in the real world. If you liked the sound of the control panel or the autoflush unit, bear in mind you can’t use them with a petrol unit. Rainman says the unit burns about 600ml of petrol per hour, which at today’s gas prices is about EUR 0.70 per hour, or one Euro of fuel for 200L of water.

Rainman Watermaker Review – Size and Quantity Options

Once you’ve decided on a power source, you can then choose the size and quantity of RO membranes to go with it:

• The AC and petrol units can both take two full-size membranes for maximum output – and you’re encouraged to go down that route, because the increase in water output far outstrips the increase in power consumption. Alternatively, you can fit one full-size membrane if you’re really on a budget, or there’s a cute compact unit with two half-size membranes if you’re seriously short on space and/or weight! For 90+% of boats the first option is the best and there isn’t much reason to consider the others. With two full-size membranes you can expect to make 100 – 140 litres of water per hour. With a single membrane, or the two half-size units, you’ll make 50 – 70.
• The DC unit only supports a single full-size membrane – there are no other options. You’ll also make less water than an AC or petrol unit using the same membrane – about 30 litres per hour. If you’re a family, or you have high water needs for some other reason, you’ll likely want to try to get up to an AC unit with two membranes as you’ll make up to 5X as much water per hour. For us, that wasn’t really relevant – it was the difference between making water for 20-30 minutes a day, or an hour. It didn’t seem worth upgrading our inverter or buying a larger genset.

Rainman Watermaker Review – Portable or Permanently Installed

And finally, decide whether you prefer a portable (cased) or permanently-installed (naked!) system:

• If you want petrol, it only comes in the portable, cased form factor. Note that you can’t use the control panel or the autoflush with portable form factors.
• AC or DC electric units can either be portable or permanently installed. The same caveats apply regarding the autoflush and control panel. The cased form-factors come in a rugged, blue plastic case that seems like it will stand up to a lot of abuse.

Portable systems are good if you simply don’t have space to permanently install the unit, and they offer the flexibility of being able to stow your Rainman in a locker when not in use. The PSU needs to stay quite cool while in use, and operating the unit in the open air is a pretty solid guarantee that it will. They’re also great if you don’t have a spare through-hull and you don’t fancy cutting a hole in your boat – you just dangle the hose over the side, making sure it’s good and deep but not amongst any fouling. However, you add a lot of man-hours to your watermaking operation (setting up, packing down, manually flushing…), which should definitely be factored in. You can’t autoflush, and you’re more likely to make a mistake – sucking up air or fouling can damage the unit, and the more times you manually dangle a hose over the side the greater your chances of doing so.

On Hot Chocolate, we already had two perfect, spare through-hulls from where the engine-driven fridge compressor used to be. One of them is deep down in the keel, allowing for a clean bite of water with near-zero chance of fouling or air bubbles. We can make water while underway without needing to watch the hose. The latter was perfectly positioned above the waterline so we can observe the brine output and check it for bubbles (part of the procedure for making water). This made choosing a naked system a no-brainer for us, but I think even if we didn’t have the spare holes in the boat we would probably have made the same decision.

And that’s it – that’s your three basic choices . If you went for a naked system you have a further two optional extras in the form of the control panel and autoflush, both of which represent pretty significant quality-of-life upgrades if you can afford them – but it’s still a fantastic piece of kit if you can’t!

Rainman watermaker review of the installation documentation

I know we’ve already mentioned this, but the documentation is really excellent and it’s clear there has been a lot of thought put into the product. It’s evident Rainman expect people to self-install, whereas when we spoke to one of their competitors (who we won’t name!) they stated “if you need to ask us any questions you shouldn’t be installing it”! Again, this shows a level of pragmatism, forward thinking and just common sense on Rainman’s part that we sometimes found lacking in competitors.

If you’re a manufacturer reading this, please understand that cruising yachts absolutely are going to install and maintain their own electronics, and we’ll desert you in droves if you try to lock us out!

Reviewing the Rainman watermaker installation process

We were pleasantly surprised to find that the unit came with almost everything we needed to install it. We were expecting to supply our own hoses, sundries, etc. but Rainman supplies everything you need – hoses, jubilee clips, hose splitters, T-valves… while we were installing it our local chandlery told us a horror story about a boat who had been waiting eight weeks for a replacement hose for their non-Rainman watermaker, so we greatly appreciated the completeness of the kit! I believe the only items we had to add was a splitter to tee the fresh water output into our tank, because we have the flexible plastic variety and the supplied fittings assumed a conventional solid tank. We happened to have one on board, so our additional material overheads were exactly $0.

Installation was really very straightforward. End-to-end it took me two days to install and test the unit, plus an extra day to get the autoflush set up.

We had a tiny teething problem in that one of the hoses was supplied with an adaptor, and we needed to remove it to screw it in correctly. We raised a ticket with Rainman, they replied in about 2 hours, and had already followed up to see if we were sorted by the time we read their first email!

Only basic hand tools were required to complete the installation, and in fact most of the connections are toolless (e.g. push-fit connectors). We’re now about three weeks into our ownership, and so far, I can honestly say we don’t have a bad word to say about either the company or the unit itself. Our intention is to update this in 6 – 12 months once we’ve had our Rainman for a season and let you know how it shapes up!

Our Rainman arrived from Australia to Greece in a little under 3 weeks, although Greek customs took a further 3 weeks to clear! We ended up having to pay a total of EUR 1100 in VAT and import duties, which was about what we expected. We’ve heard of people not getting charged anything, so it seems to be a bit of a lottery. The biggest hurdle we faced importing it was getting an EORI number (a Greek tax code for imports worth more than EUR 1000). We ended up using our boatyard’s EORI number, meaning they paid customs and we paid them back.

If you have any questions about Rainman or watermakers in general, feel free to use the comments section below and we’ll do our best to help. We’ve also tried to compile some answers to the questions we had when we started this journey and some of the most common ones you see online ( find this section below ). If this review was useful to you, please consider sharing it or joining our newsletter for more quality content and awful puns!

Check out Rainman products here.

Can I run a watermaker off an alternator?

Yes, you can use the power from your alternator while motoring to run your watermaker. Just be aware that if you’re underway, you might be creating bubbles… and if you suck up a bubble it can damage your membranes. Make sure the intake hose is good and deep and your wake is free of bubbles, or just bank the power and make water when you get to the other end.

Can you drink water from a watermaker? Is it good / bad for you?

Absolutely. When your watermaker is functioning correctly it should make water with around 300PPM (parts per million) of contaminants. Safe drinking water is usually 500 – 800, so in most cases, it’s actually cleaner than the water you usually drink!

How to take care of a sailboat watermaker

The number one enemy of watermakers is fouling. When you suck up sea water, it contains billions of microorganisms like plants and algae. Your watermaker filters them out, but some of them get caught in the membrane and can start to grow. The best way to take care of a watermaker is to run it very regularly to flush the microorganisms out before they get a chance to take hold. Run your watermaker every 2 – 3 days minimum, pickle it when not in use, and strongly consider getting a system with an autoflush function like a Rainman – it will make your life a lot easier.

How much water does a Rainman watermaker produce?

It varies, but between 30 litres an hour for a smaller unit or up to 140 litres an hour for a larger unit.

How much electricity does a sailboat watermaker need?

It depends on the size of the watermaker, but basic units consume around 400W, and bigger units around 1.2kW.

Can I run a watermaker off solar power? Do I need a generator if I have a watermaker?

Absolutely, you can run a watermaker off solar power. We have a 400W unit that we run from our 360W panels, via our 12V battery bank. We rarely need to generate in order to make water.

12V vs mains-powered watermakers

Mains-powered watermakers are generally more efficient, producing more water both per Watt and per hour. However, you need a fairly large inverter or generator to use a mains-powered unit. We opted for a 12V system because we didn’t need the speed of a mains-powered system, and we didn’t want to have to upgrade our inverter to accommodate one. You can find more information about why we chose a DC system in the body of this review.

Can you use a watermaker to make water from a river?

Some watermakers can make water from brackish water as well as salt. Some manufacturers require you to specify at the point of purchase, whereas others (like the Rainman) can handle it with a simple pressure adjustment. Just be sure to read and follow the manual carefully or you can damage your membrane.

Solar still vs boat watermaker?

A solar still is a device that makes clean water by evaporating sea water. It’s a great piece of kit to have in a grab-bag, particularly if you’re attempting a longer passage. You can get inflatable solar stills that fold down to the size of a pack of cards. Solar stills are excellent emergency gear but not a replacement for a watermaker, because they typically only make 1-2 litres per 24 hours – vs 2,000+ litres per 24 hours for a watermaker. Their principal advantages are portability and the fact they don’t need any electricity to operate. Both have a home on an ocean-going sailboat!

DIY watermakers

A number of plans circulate online for DIY watermakers. Watermakers are essentially pressure washers that force sea water through a membrane or filter to produce clean drinking water. It’s reportedly possible to build your own using off-the-shelf components (like pressure washers!), and save perhaps $1000 vs buying a pre-configured watermaker. While we’ve heard a lot about the concept over the years, we’re yet to meet a sailor who has built one themselves. Let us know in the comments if you’ve built one and how it’s working out for you!

Watermakers VS Brita filters, filter jugs, lifestraw, etc.

What’s the difference between a water filter jug and a watermaker, and why does one cost $10 while the other costs ~$5000?

Filter jugs use filtration and something called “ion exchange”, meaning the water trickles through a pad made of something like cotton to remove large particles, and activated charcoal or ion exchange resin which reacts with and “grabs” semi-volatile organic compounds out of the water. Sometimes they also use silver, which is antimicrobial, or UV light to kill out bugs. Filter jugs typically can’t remove heavy metals like lead and mercury, and they certainly can’t desalinate water (remove the salt and make it safe to drink). For that level of filtration you need to pressurise the water and use a much more sophisticated filter called a “reverse osmosis” membrane, hence the cost and complexity of a watermaker. The closest cheap equivalent is a solar still (see above).

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13 comments.

Thanks for the detailed review and analysis of the various pros and cons. I plan to get a Rainman for my boat – also in Greece and am weighing up the options. Good practical advice about the autoflush option! Also, I notice you didn’t buy it from the Greek distributor – is there a reason?

Hello, thanks for the comment, and glad it was useful. We have to admit that out of all the upgrades we’ve made to the boat, this is the one that has run the smoothest – the whole process. We’re very, very happy! The reason we didn’t buy from Greece was as simple as price. Adam actually emailed Rainman with a whole bunch of questions (he likes to do his research!) and they cut us a very good deal that made it cheaper to buy from them. It was marginal though so if we hadn’t been out of the water all winter and had been in a rush to get our hands on it we would have bought from Greece. Hope that helps!

This is the best watermaker review I’ve read, haha! I was going to buy Spectra but now I’m seriously considering Rainman.

Thanks! Honestly would recommend it. Let us know which you go for and how you get on!

A very comprehensive and informative review, I’ve been researching these products for some time and can find very little to help me make a decision, can you also let me know how long you’ve had yours and if this has been reliable? I really want to make the right decision when I get one.

Hello, thanks for the comment. Glad we could help! We’ve had ours for a year now and it’s one of those bits of boat equipment that we just don’t think about because it works so seamlessly. Probably the best thing we’ve invested in for the boat (it was expensive but worth every penny!) Let us know if you go for the Rainman and how you get on.

Will do. I follow your blog closely, I’m a big fan of your lifestyle and your honest writing style.

what a great article, I love how honest and balanced this is. 5 stars

Thanks Rachel, really glad you found this useful and hope you do go for a Rainman watermaker. It’s one of the best purchases we’ve made for the boat!

So, you don’t g the specifications for the 12 volt model, what is the AMP versus gallon output ?.

was sent this article by a friend and it did not dissapoint. very thorough and clear explanation. can you review spectra next? ty

Thanks for your feedback and so pleased you found the watermaker review useful. If we ever go a different route in the future we will definitely give some honest feedback on whatever watermaker we opt for!

Comments are closed.

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Boat Water Maker: Ensuring Abundant Fresh Water Supply Onboard

Boat water maker: When out at sea, one of the most essential resources for any boat or yacht is a reliable and efficient water supply. Running out of water can be a frustrating and limiting experience, especially during extended trips or when anchoring for extended periods. This is where boat water makers come into play, offering a solution to the problem of water scarcity on board. In this comprehensive guide, we will explore the world of marine water makers, their benefits, and the different types available. Whether you are a day fisherman, a long-range sailor, or a transoceanic yachtsman, there is a boat water maker that suits your needs.

The Importance of Marine Water Makers

Ensuring an abundant supply of fresh water.

One of the primary advantages of installing a marine water maker on your boat is the ability to ensure a constant and abundant supply of fresh water. Instead of relying solely on external sources or limited onboard water storage, a boat water maker allows you to convert seawater into clean and drinkable water. This not only provides a sense of self-sufficiency but also eliminates the need to constantly restock your water supply during your journey.

Enhanced Flexibility and Independence

By having a boat water maker, you can significantly increase your flexibility and independence while at sea. You are no longer restricted to relying on marinas or specific locations with access to freshwater sources. This is especially beneficial for long-range sailors or transoceanic voyagers who may spend extended periods away from land. With a marine water maker or boat water maker, you can venture further and stay at sea for longer. Andexploring remote destinations without worrying about the availability of fresh water.

Cost-Efficiency in the Long Run

While the initial investment in a boat water maker may seem substantial, it can be a cost-effective solution in the long run. By producing your own fresh water on board. So, you can reduce or eliminate the need to purchase bottled water or rely on expensive marina services. Over time, the savings on water expenses can offset the initial cost of installing a marine water maker, making it a wise investment for avid boaters and sailors.

Understanding Desalination for Boats

The basics of desalination.

At the heart of a boat water maker lies the process of desalination. Desalination is the removal of salt and other impurities from seawater, transforming it into clean and potable water. So, this process allows boaters to make use of the abundant seawater surrounding their vessels and convert it into a freshwater source. Meanwhile, there are different methods of desalination, but one of the most commonly used and efficient techniques for marine boat water makers is reverse osmosis .

Reverse Osmosis Technology

Reverse osmosis is a widely adopted technology for desalination on boats and yachts. So, it involves the use of a semi-permeable membrane that allows water molecules to pass through while trapping salts and other impurities. Hence, Seawater is pressurized and forced through this membrane, separating the freshwater from the concentrated brine. So, the freshwater is collected and stored for use, while the brine is discharged overboard. This process ensures that the water produced by the boat water maker meets the necessary standards for drinking and other onboard uses.

Exploring Different Types of Boat Water Maker

The ck-sw series: fully automatic megayacht & commercial size watermaker.

The Large CK-SW series represents the pinnacle of boat water makers. So, it is offering fully automatic operation and high capacities suitable for mega yachts and commercial vessels. Designed with one-touch operation and continuous monitoring, the Large CK-SW ensures maximum water production and quality. With a user-friendly 7-inch full-color touch screen interface, controlling and monitoring. So, the water maker becomes intuitive and effortless. The Large CK-SW is available in a range of capacities, from 2,100 gallons per day up to 3,400 gallons per day, catering to different water demands on larger vessels.,

The CK-SW: Cutting-Edge Control Technology for Efficient Water Production

The CK-SW series of boat water makers incorporates advanced control technology to optimize water production. Equipped with a 7-inch full-color icon-driven touch screen controller. So, these systems offer seamless operation and precise monitoring of key system functions. With capacities ranging from 475 gallons per day to 1,850 gallons per day. Meanwhile, the CK-SW series caters to a wide range of vessel sizes and water requirements. Furthermore, all CK-SW series systems are fully upgradeable, ensuring that your water maker can grow alongside your boating needs. To more details you can find in Commercial Sea Water Desalination System link.

Maintenance and Care for Boat Water Makers

Fresh water flush and pickling for long-term storage.

Proper maintenance and care are crucial to ensure the longevity and optimal performance of your boat water maker. When storing the system for more than a couple of days, it is essential to perform a fresh water flush and pickling process. This simple procedure, which takes only five minutes, involves flushing the system with fresh water and using a pickling solution to prevent the growth of bacteria or other contaminants. By following this maintenance routine, you can keep your boat water maker in excellent condition, ready for its next use.

Regular Replacement of Prefilter and Impeller

To maintain the efficiency of your boat water maker, it is necessary to replace certain components at regular intervals. The prefilter , which is responsible for removing larger particles and impurities from the seawater, should be changed after 5-50+ hours of use, depending on the cleanliness of the water source. For example, cartridge filters must be change in 15 or 30 days. Additionally, the impeller in the lift pump should be replaced every one to two years, depending on usage. Regularly replacing these components ensures optimal performance and avoids any potential issues that could arise from wear and tear.

High Pressure Pump Oil Change and Reverse Osmosis Membrane Replacement

As part of routine maintenance, it is recommended to change the high-pressure pump oil every 300 hours of use, using the appropriate SAE-30 weight oil. This ensures that the pump operates smoothly and efficiently. Furthermore, the reverse osmosis membranes, which are responsible for desalination, should be replaced every 5-10 years to maintain the boat water maker’s performance. If you notice a decrease in the system’s productivity, it may be an indication that the pump seals need replacement. Regular maintenance and component replacement will help prolong the lifespan of your boat water maker.

Spares, Consumables, and Accessories for Boat Water Maker

To ensure that your boat water maker continues to operate at its best, it is essential to have access to spares, consumables, and accessories. CHUNKE Water Desalination, for example, offers a wide range of spare parts and consumables specifically designed for their water maker systems. These include filters, remotes, fluids, and other essential components that may need replacement or upgrading over time. By having access to these items, you can easily maintain and service your boat water maker, ensuring its reliable operation for years to come.

Investing in a boat water maker is a game-changer for boaters and sailors who value independence, flexibility, and a reliable supply of fresh water. Whether you choose the fully automatic Large CK-SW series,, or any other CHUNKE boat water maker system, you can enjoy the benefits of desalination technology on board. By understanding the basics of desalination, exploring the different types of marine water makers available, and following proper maintenance procedures, you can ensure a constant supply of clean and drinkable water on your boat or yacht. Say goodbye to water scarcity and embrace the freedom of the open sea with a boat water maker.

If you want to get more details about boat water maker, please feel free fill in contact form and send us your question. Our technical sales team contact you in 24 hours.

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Rainman Portable Water Maker

Why portable.

The origins of Rainman established our reputation as the “Portable Watermaker” in the blue case. Although many customers will prefer to install their Rainman, many benefits exist for keeping your system portable.

• You don’t need to install the system. Ten minutes after receiving the system, you can be making fresh drinking water.
• If you are a cruiser and a racer, you can easily offload about 2/3 of a crew member in weight by putting the watermaker ashore.
• No extra holes in your hull.
• If you are space constrained, you can remove the system for more people and gear on shorter trips.
• If maintenance is required, you bring the system to a technician rather than a technician to your boat.
• When you upgrade your boat, the system goes with you. Installing a system in your boat will not add much value to your boat.
• You can loan it to a friend.
• Reduced initial cost due to no expensive installation process.
• You can fill up your neighbour’s tanks with our product water extension hose.
• Moving the system around is easy if you have an RV, live near water, or have another boat.
• You can easily resell the system if you are no longer getting use out.
• Minimise risk to your vessel during storm season by leaving your Rainman ashore.

System Types Available

You have maximum flexibility in power sources if you wish to keep your system portable. Any of our three platforms can be used as portable. In order of popularity, these include:

AC powered watermaker The primary design principle in the AC Rainman is that it must start and run using a Honda 2kVA portable generator. The ubiquity of this generator has helped make it the most popular system in our range. It can also run on a good quality 2kVA inverter. Higher capacity generators and inverters are commonly used as well.

Petrol (gasoline) powered watermaker   An update of the original Rainman, this system can run without any external electricity source. Just add fuel and salt water. We designed this with a Honda GXH50 motor and a simple belt drive system.

12-volt DC powered watermaker This system was designed with lower power and lower flow rates. Simplicity and low maintenance is retained by utilising a simple triplex plunger pump. Due to the lower productivity and requirement for a shorter power cord, this system is more commonly installed than kept portable.

Two Components – One Watermaker

The system is made up of a pressure supply unit (PSU) and a reverse osmosis unit (RO). Both parts are required to make a complete watermaker. The PSU lifts the seawater, filters out the sediment and puts the system under high pressure, while the RO unit extracts fresh water from the stream of pressurised seawater. Most of the water goes out to waste as brine output, while about 20% of the volume is extracted as fresh potable water for your tanks. Different RO options exist for you to select with your AC Rainman system, each to achieve their own specific objective.

Flexibility for the Future

If you are uncertain whether you wish to have a portable or installed watermaker, the best option is to buy the portable version. You can then run it portable for a while and decide if you are happy with that configuration or wish to install it at a later date. It also gives you more time to determine where you want to install the system. Analogous to buying a pre-owned house, you live in it for a while before deciding what renovations you might require. It is easy to install a portable watermaker, but you do not want to uninstall a permanently mounted system.

Using the Watermaker

After a few uses, it will take about two minutes to set up your watermaker for use. More detail is available in the operations manual, but the steps are:

• Set the systems up. You may choose to leave the systems in a locker and only move the hoses around.
• Hook the black high pressure hose from the reverse osmosis case (RO) into the quick connect coupling on the pressure supply unit (PSU).
• Put the intake hose into seawater.
• Put the green waste brine hose overboard.
• Turn the system on.
• Slowly pressurise the system to 55 bar (800 psi) using the control valve. Fresh water will begin coming out of the white product water hose.
• Let it run for a short period of time, then put it in your tank.
• When tank is full, depressurise the system and put it away.

Maintenance Requirements

While there is limited maintenance on your Rainman watermaker, there are a few things that should be looked after to ensure a long life of your system.

When storing system:

• Fresh water flush and pickle the system when storing it for more than a couple days. This may sound complex, but it is an easy five minute process with no specialist knowledge required.

5-50+ hours of use:

• Change the non-proprietary prefilter after 5-50+ hours of us, depending on cleanliness of the source water.
• Change non-proprietary impeller in the lift pump after a year or two, depending on use.
• Change the high pressure pump oil each 300 hours of use, using SAE-30 weight oil.

5-10 years:

• Change the non-proprietary sized reverse osmosis membranes after 5-10 years.
• If your system starts losing performance, the non-proprietary pump seals may eventually require replacing.

Spares and Consumables

Your new Rainman system will arrive with enough spares and consumables to keep you going for a while, so most customers do not need to order more with initial purchase. There are a variety of items you will need over time to keep your system running for many years.

» Rainman Watermaker spare parts and consumables

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• Dec 8, 2021

5 Best Watermakers for Sailboats

Last Updated by Daniel Wade, October 1, 2021

With the right Watermaker, the ocean becomes an almost immeasurable supply of fresh and clean drinking water to keep you hydrated during your offshore sailing adventures.

Many sailors do spend a lot of their time and money on various parts of the sailboat including the sails, engine, electronics, and generators especially when preparing for long-distance voyages.

While there's absolutely nothing wrong with this, they often overlook one crucial part of general human survival: having an ample supply of fresh drinking water.

Whether you have freshwater drinking tanks on your sailboat or planning to cruise in areas where you can easily access clean drinking water, the hassle involved in having to come to the dock to fill the water tanks can be quite overwhelming.

This is exactly why you need to find the best watermakers for sailboats.

Like many other nautical technologies, watermakers have significantly advanced in the last few decades to become very efficient and more reliable. They're no longer a luxury on your sailboat but a necessity. Better still, watermakers have become relatively affordable and are meant to keep you hydrated as you explore areas that do not have clean and fresh drinking water.

In this article, we'll take a look at how watermaker systems work, highlight their benefits, and highlight the best sailboat watermakers on the market right now. At the end of this read, you should be able to choose the best watermaker for your sailboat.

Benefits of Having a Watermaker on Your Sailboat

The freedom and security that come with having full water tanks on your sailboat are of immense importance, especially if you're cruising in an area where fresh drinking water is hard to come by and quite expensive when you do. As such, having a watermaker aboard your sailboat is no longer a luxury like it used to be in the past. With a steady supply of fresh and clean water, your life on the sailboat will be a lot better. This is because you'll have enough clean water to drink, cook, wash, and shower, which is beneficial if you want to enjoy your sailing adventures.

Honestly speaking, many sailors do not actually need a watermaker. Well, if you're planning to sail just near the shores, then there's a chance that you can easily access fresh and clean water by the dock. But this can be limiting if you've been dreaming of going off the grid and sailing to some exotic and unknown places in the world.

With that in mind, a watermaker makes a lot of sense to most sailors. You won't have to worry about having to carry aboard gallons of freshwater for cooking and drinking during your voyage. You won't have to treat freshwater as a precious commodity that must last until you can refill at the next port. With a watermaker, you can simply go ocean crossing without worrying about running out of water.

A watermaker allows you to have a steady supply of fresh and clean water to keep everybody well-hydrated and healthy. You can clean the water anytime you feel like and all you have to do is replace the filter once in a while and you'll be good to go. In essence, a watermaker is probably one of the most important equipment to have aboard your sailboat, so installing it is of great importance if you're a serious sailor.

The Basics of Modern Marine Watermakers

Modern marine watermakers essentially follow the principle of reverse-osmosis to produce pure, drinking water from seawater. During this process and through very high pressure, seawater is forced through a semipermeable membrane that only allows freshwater molecules to pass through it but not salt, bacteria, or any other organic material. The newly made pure, drinking water is then piped to the sailboat's water tanks while the leftover (brine) is discharged overboard.

Even though marine watermakers may differ in the type of pump that's employed and how it is driven, this is one of the most important features in every watermaker. In most cases, water can be electrically pumped or powered directly off the boat's engine. If you have an AC generator or alternator on your boat, it would make much sense to use the AC output to drive the watermaker directly. You can also choose the DC-powered models if you rely on renewable energy from solar or wind. Alternatively, you can still go for AC-powered watermakers but you'll have to buy an inverter.

All in all, DC-powered watermakers are more efficient since they integrate a power-saving energy recovery system (ERS). You must, however, keep in mind that your energy consumption levels might be quite high if you're sailing in colder and saltier areas. This is because the water purification process might be a bit slower in such areas. As such, you should consider investing in a more high-powered watermaker system if you will be sailing in colder and saltier areas than if you're planning to sail more in warm and less salty areas.

As far as an engine-driven watermaker is concerned, you should mount the high-pressure pump on the engine so that it can be belt-driven using an automatic clutch. An engine-driven watermaker should be your first option if you want large quantities of fresh drinking water. This is more productive than AC or DC-powered watermakers. Even with a relatively small engine, this setup has an automatic regulator that constantly pumps the water. With that in mind, engine-driven watermakers are ideal if you want to reduce your energy consumption. To put it into perspective, an engine-driven watermaker can lower energy consumption by an enormous 80%, especially when compared with conventional AC or DC-powered watermaker systems.

How to Choose the Best Watermaker for Your Sailboat

There are many factors to consider when looking for the best watermakers for your sailboat. Here are the most important things to consider.

Your Freshwater Needs

One of the most important things to consider before spending your money on a watermaker is your freshwater needs. What quantity would be enough to keep you going on your sailing adventure? While the quantity might differ from one sailor to the other or from one boat to the other, you should consider the number of gallons that a particular watermaker can produce per day. This will help you in choosing the ideal watermaker; a model that will ensure that you never run out of water. Do not underestimate your water needs, especially if you're planning to sail with your children or if you're planning to stay on the boat for an extended period of time.

Do you have enough space on your vessel to accommodate the type of watermaker you're looking to buy? While most watermakers are designed to fit in the smallest of space, you should consider the actual size of the watermaker and find out whether you have enough space on your vessel to fix it.

Watermakers can run on electricity, renewable energy such as wind and solar (if you have them on your vessel), or both. When looking for the perfect watermaker, you should consider how to power it and whether or not the watermaker has low-energy consumption, which is definitely a great feature. Again, there are also engine-driven watermakers, so it's important to know exactly what you're going for.

Maintenance

Watermakers have a reputation for being difficult to maintain. Fortunately, the equipment and components have improved in the last few years so you should go for a model that's easy to maintain. You should use the watermaker in water bodies that look good, You should avoid using the watermaker in dirty harbors as you may have to change the filters every so often or even damage your watermaker altogether.

Best Watermakers for Sailboats

Let's take a look at the best watermakers available on the market right now.

The Ultra Whisper

Engineered by limited electrical options that can run on either DC or AC, THE Ultra Whisper by Sea Recovery is one of the best watermakers currently available on the market. In addition to being very quiet, this watermaker features an automatic operation that requires very minimal operator adjustment.

This watermaker is ideal for small powerboats and sailboats since it can serve as an efficient water supply. This model boasts about a 75% reduction in power consumption, especially when compared to other models.

‍Smooth and quiet water production

Can produce up to 2,280 liters per day

Ideal for small boats

It is energy efficient

‍It might not be perfect for large boats

Echotec Watermaker

If you want a watermaker model that can produce 60 liters per hour flawlessly and with no maintenance apart from changing the filters, look no further than the Echotec Watermaker. This model is designed for ultra-reliable performance and easy customer installation.

This watermaker is made from high-quality components that can withstand the continuous harsh marine environment, making it one of the most durable watermakers on the market. This is essentially a series of modular watermakers ranging from 12-volt to 24-volt DC-powered models. They bring forth energy efficiency, a computerized energy recovery system, and ultimate reliability to ensure that you never run out of fresh drinking water while out there on the sea.

‍Energy efficient

Cost-effective

‍Comes with a very low speed

Not ideal for large boats

Spectra Katadyn PowerSurvivor

As a compact and energy-efficient watermaker, the Spectra Katadyn PowerSurvivor is arguably the most affordable watermaker currently available on the market. We are talking about a model that only requires 4 amps to desalinate water for your sailboat. It can produce 1.5 gallons of fresh drinking water per hour, which is an excellent return for a watermaker of its size.

It is also one of the most portable watermakers around. You can choose to either install it permanently or temporarily in case you want to take it somewhere else. This portability is also essential if you're looking for a space-saving model that can fit in the smallest of compartments. Its simple but rugged design is essential in ensuring that it can perform at its best even in harsh marine conditions. In terms of its power capabilities, this is the only model on the market that will convert to a hand-operated system or manual power if there's a power shortage.

‍Portable and lightweight

Rugged design to withstand harsh marine environments

Efficient and reliable

Can revert to manual power if there's a power shortage

Perfect for off-grid sailing

‍Gasoline or diesel can easily damage the semi-permeable membrane

Village Marine - Little Wonder Series

Whether you're looking for a watermaker for your small sailboat or looking for a watermaker that can efficiently serve those huge yachts, the Village Marine Little Wonder Series provides everything. This model is meant for experienced sailors who are looking for various capacity options. This watermaker weighs just about 69 pounds but can produce nearly 180 gallons of fresh drinking water each day.

Designed with a low RPM high-pressure pump, this model remains one of the most efficient and economical watermakers on the market. That's not all; this watermaker is designed with corrosion-resistant features and is one of the most serviceable watermakers in the game. It is reliable, quiet, and portable; all factors that make a watermaker great.

‍Easy to operate

Corrosion-resistant

Easy to maintain

Quiet and versatile

‍It doesn't have automatic adjustment controls

Ventura 150 Watermaker

This is one of the most versatile watermakers on the market. It can use both electricity and renewable energy. This model is engineered to be lightweight and energy-efficient and its compact and modular design makes it a great option if you're looking for a watermaker that's easy to use and install in confined spaces.

The Ventura 150 watermaker is highly efficient as it can produce over 6 gallons of water an hour, which makes it quite perfect for small vessels. This sailboat watermaker features a controller that allows you to operate and monitor the device remotely. It also has the auto store button that will automatically flash the system after every five days.

This watermaker is quiet and surprisingly compact despite its ability to produce about 150 gallons of water per day. It also gives you the option of going for the automated manual or manual model.

‍Very versatile

Can use both electricity and renewable energy power

It is smooth and quiet

It is compact and lightweight

‍The manual model has analog controls

To this end, it's easy to see that having an ideal watermaker aboard your vessel is one of the first crucial steps towards being self-sufficient and sustainable. With a watermaker, you'll be able to access fresh drinking water at all times when sailing even in far-flung places. Most of these models are well-constructed and incorporate some of the best technologies that make them efficient, reliable, and easy to install, use, and maintain.

So when it comes to choosing the best watermaker for your sailboat, it may all come down to what is ideal for you in terms of energy consumption, efficiency, the quantity of water produced, among many other things. With an ideal watermaker, you can remain off the grid for as long as you want without ever worrying about running out of water and this is of great importance in enjoying your sailing adventures.

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Savvino-storozhevsky monastery and museum.

Zvenigorod's most famous sight is the Savvino-Storozhevsky Monastery, which was founded in 1398 by the monk Savva from the Troitse-Sergieva Lavra, at the invitation and with the support of Prince Yury Dmitrievich of Zvenigorod. Savva was later canonised as St Sabbas (Savva) of Storozhev. The monastery late flourished under the reign of Tsar Alexis, who chose the monastery as his family church and often went on pilgrimage there and made lots of donations to it. Most of the monastery’s buildings date from this time. The monastery is heavily fortified with thick walls and six towers, the most impressive of which is the Krasny Tower which also serves as the eastern entrance. The monastery was closed in 1918 and only reopened in 1995. In 1998 Patriarch Alexius II took part in a service to return the relics of St Sabbas to the monastery. Today the monastery has the status of a stauropegic monastery, which is second in status to a lavra. In addition to being a working monastery, it also holds the Zvenigorod Historical, Architectural and Art Museum.

Belfry and Neighbouring Churches

Located near the main entrance is the monastery's belfry which is perhaps the calling card of the monastery due to its uniqueness. It was built in the 1650s and the St Sergius of Radonezh’s Church was opened on the middle tier in the mid-17th century, although it was originally dedicated to the Trinity. The belfry's 35-tonne Great Bladgovestny Bell fell in 1941 and was only restored and returned in 2003. Attached to the belfry is a large refectory and the Transfiguration Church, both of which were built on the orders of Tsar Alexis in the 1650s.  

To the left of the belfry is another, smaller, refectory which is attached to the Trinity Gate-Church, which was also constructed in the 1650s on the orders of Tsar Alexis who made it his own family church. The church is elaborately decorated with colourful trims and underneath the archway is a beautiful 19th century fresco.

Nativity of Virgin Mary Cathedral

The Nativity of Virgin Mary Cathedral is the oldest building in the monastery and among the oldest buildings in the Moscow Region. It was built between 1404 and 1405 during the lifetime of St Sabbas and using the funds of Prince Yury of Zvenigorod. The white-stone cathedral is a standard four-pillar design with a single golden dome. After the death of St Sabbas he was interred in the cathedral and a new altar dedicated to him was added.

Under the reign of Tsar Alexis the cathedral was decorated with frescoes by Stepan Ryazanets, some of which remain today. Tsar Alexis also presented the cathedral with a five-tier iconostasis, the top row of icons have been preserved.

Tsaritsa's Chambers

The Nativity of Virgin Mary Cathedral is located between the Tsaritsa's Chambers of the left and the Palace of Tsar Alexis on the right. The Tsaritsa's Chambers were built in the mid-17th century for the wife of Tsar Alexey - Tsaritsa Maria Ilinichna Miloskavskaya. The design of the building is influenced by the ancient Russian architectural style. Is prettier than the Tsar's chambers opposite, being red in colour with elaborately decorated window frames and entrance.

At present the Tsaritsa's Chambers houses the Zvenigorod Historical, Architectural and Art Museum. Among its displays is an accurate recreation of the interior of a noble lady's chambers including furniture, decorations and a decorated tiled oven, and an exhibition on the history of Zvenigorod and the monastery.

Palace of Tsar Alexis

The Palace of Tsar Alexis was built in the 1650s and is now one of the best surviving examples of non-religious architecture of that era. It was built especially for Tsar Alexis who often visited the monastery on religious pilgrimages. Its most striking feature is its pretty row of nine chimney spouts which resemble towers.

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Custom Cabinet Makers in Elektrostal'

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Featured Reviews for Custom Cabinet Makers in Elektrostal'

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• Semi-Custom Cabinets: – offer some customization options within pre-built standard sizes and styles. You can choose from a range of finishes, door styles, and accessories. For instance, you can select a specific color and add features like pull-out shelves or spice racks.
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What does a cabinet maker near me do?

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If you search for Cabinet Maker near me you'll be sure to find a business that knows all about the latest trends and styles for your living room, bedroom, kitchen, or whole house remodel. They specialize in crafting cabinets, which are essential storage solutions in any home.

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