sailboat water tank

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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Marine tanks are onboard storage tanks for boats, sailboats, yachts, trawlers, and vessels. There are two types of boat tanks: fresh water tanks for storing potable water and holding tanks for collecting and storing of grey water or black water. National Tank Outlet’s marine tanks are manufactured from high-quality polyethylene resin that is BPA free, FDA-approved for potable water, and ANSI NSF 61 compliant.

Plastic marine tanks are made by manufacturers Ronco and Dura-Cast. The tanks are rotationally-molded with polyethylene resin to offer superior durability, service life, and resistance against cracking, rusting, and corrosion.

Marine tanks are most-commonly rectangular in shape. Custom-molded options are available for specific boat makes and models. Poly marine tanks are available in numerous capacities, dimensions, and wall thicknesses to guarantee the tank works for the specific application. These tanks can be used as new or replacement marine tanks. Tanks are available with pre-installed fittings and lids or as a blank tank with custom DIY fitting packages.

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Enjoy the exceptional quality of our marine fresh water tanks, skillfully crafted using FDA-approved, virgin polyethylene plastic resin. Designed specifically for storing potable water in various marine vessels such as sailboats, yachts, and deep-sea fishing boats, these tanks offer the perfect blend of durability and practicality. With their seamless, one-piece construction, you can rely on these marine tanks to provide a dependable water storage solution. Bid farewell to concerns about cracks or weakening over time, as our plastic marine tanks are built to withstand the demanding conditions of marine environments.

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For more detailed information, please refer to our  Marine Water Tanks (pdf)

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Our commitment to excellence drives us to provide the highest quality custom marine water tanks for your unique projects. Unlike pre-drilled tanks, these tanks offer a blank canvas, allowing you to precisely place holes and fittings exactly where you need them. This flexibility ensures that your custom boat water tank can pivot to fit seamlessly into your available space.

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• We encourage you to provide as much specific information as possible regarding your tank's size and location requirements. If you have any uncertainties or need guidance throughout the process, our dedicated team is readily available to assist you, ensuring necessary adjustments are made.

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Sturdy, Secure Storage: In addition to our comprehensive range of products, we also offer a diverse selection of custom, watertight compartments designed to cater to your unique storage requirements. Our assortment includes rounded corner open-ended compartments, square corner open-ended compartments, as well as square corner top and end compartments, available in a variety of sizes. These meticulously crafted compartments are specifically designed to provide both convenience and versatility, guaranteeing efficient organization and storage solutions for your boat. Experience the ultimate in tailored storage with our custom compartments, ensuring your belongings are securely and neatly stowed away during your marine adventures.

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Sailboat Water Tank Size

Similar to the gas tank, the water tank is also a vital component of your sailboat’s systems. A water tank can be used to hold wastewater, freshwater, and wash water. In other words, water tanks are your sailboat’s plumbing system and they supply water to the shower, galley, and even for electric toilets. Water tanks can be made of different materials like polyethylene, stainless steel, and plastic coated fabric. As for their position, they are usually safely situated somewhere inside the sailboat or they might also be portable. So, let’s see the characteristics and different uses for a water tank as well as its size.

General Info About Sailboat Water Tanks

Firstly, as we know water is heavy so it’s safer for water tanks to be situated low in the sailboat. But in case you want to add more water tanks, you’ll need to have a relatively large sailboat in order to provide some extra space. In the market, you can find many different sizes and shapes of rigid polyethylene tanks. A water tank normally has three threaded ports, one for the outlet, one for the vent hose, and one for the fill hose. Threaded hose barbs are used for hose connections. The inlet is connected to an on-deck fill and the vent line leads to a vent fitting high in the sailboat.

Keep in mind that if the vent is not higher than the fill, then it might overflow when you are filling the tank. Furthermore, remember that the outlet connection leads directly to a pump or to a manifold/Y-valve for a multi-tank installation. Finally, remember to secure hoses with stainless steel hose clamps.

Water Tank Position

Water tanks can be usually situated on each side of the sailboat or on its center in order to keep it balanced. When their location is on each side of the sailboat then they are connected together with a balance pipe of approximately 1-inch in diameter. This way both tanks are kept at the same level. Keep in mind that in case the balance pipe is small then it might take more time to fill in. This happens because the transfer of the water from one tank to the other is difficult to happen quickly enough. In fact, when the two tanks are situated at the same height then your sailboat has a balanced system that requires only a one-level indicator.

Water Tanks Materials

Different materials can be used to manufacture water tanks. These can be stainless steel, polyethylene, aluminum, and flexible fabric. When it comes to measuring the pros and cons of these materials, everyone has its own characteristics. For example, polyethylene water and waste tanks don’t usually retain odors, compared to tanks that are made out of stainless steel or aluminum. On the other hand, stainless steel tanks are less prone to rust or corrosion problems but their cost is relatively high than polyethylene tanks. As for their construction water tanks have baffles that prevent excessive movement of the water inside. However, the in-between spacing depends on their construction materials. For instance, a Tek-Tank polyethylene tank will have a baffle spacing of approximately 250mm and 350mm. But, a stainless steel water tank usually has fewer baffles with a spacing of 500mm.

Tank Fittings

The hose that is used in order to connect the fill point on the tank to the deck filler can be of two kinds. Either a green-tinted delivery hose or a clear braided hose. The vent pipe and feed have usually a very small diameter, around ½-inch. This diameter suits the best for pumps and deck fittings. As for the hose tails which are basically the fittings connecting to the hoses; they’re barbed so that the pipe won’t come off. Therefore, the hose is pushed into the hose tail and then tightened with a jubilee clip. You can also use thread sealant or Teflon tape on all threaded fittings. Moreover, remember not to overtighten fittings in plastic tanks.

Water Tank Size

Let’s now see some examples of water tank sizes on different types of sailboats:

• The Bavaria Cruiser 34 has a 39-gallon water tank capacity.
• The Hunter 32 Vision has a 50-gallon water tank capacity and the tank is located under the V-berth.
• The Catalina 310 has a 55-gallon water tank capacity
• The Beneteau Oceanis 51.1 has a 106-gallon water tank capacity, located under the berth in the forward cabin.
• The Sparkman & Stephens 52ft Yawl has 2 stainless steel water tanks installed beneath the saloon sole. Each one has a capacity of approximately 50 gallons. 
• The Bavaria C45 has a 143-gallon water tank capacity.
• The Island Packet 38 has an aluminum 157-gallon water tank situated under the sole.
• The Amel 50 has a 160-gallon water tank capacity.
• The Hallberg-Rassy 64 has a 331-gallon water tank capacity.

The size of a water tank in a sailboat depends on different factors. Mainly, the model and type of your sailboat, its plumbing system as well as the tank’s materials, position, and construction . There is a wide range of sailboat water tanks available on the market for drinking water, wastewater, or where space is not enough, flexible water tanks. The most common materials are polyethylene, stainless steel, and aluminum. Moreover, there is a variety of shapes and capacities, ranging from 40 to 400 gallons . Keep in mind to drain water tanks of any waste or water when preparing your sailboat for off-season storage. Like this, you’ll prevent any unexpected damage by freezing temperatures. Last but not least, do not consider using any tank that is not easy to pump out.

Peter is the editor of Better Sailing. He has sailed for countless hours and has maintained his own boats and sailboats for years. After years of trial and error, he decided to start this website to share the knowledge.

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Water Tanks - Plastimo Flexible Fresh Water Tanks - 9.25, 13 , 26, 33, 40, and 52 Gallons - High Resistance.

Product Description

FLEXIBLE FRESH WATER TANK – 9 to 40 GALLONS- PLASTIMO 

Specifications:

35 Liters    55 cm  x  70 cm  - Trapezoid-  9.25 Gal.* 50 Liters    070 cm x 70 cm  - Square - 13 Gal ** 100 Liters  105 cm x 70 cm  - Rectangular - 26 Gal ** 150 liters   140 cm x 70 cm  - Rectangular - 40 Gal ** 200 liters   175 cm x 70 cm  - Rectangular  - 52 gal ** 120 liters     105 cm x 115 cm x 38 cm  - Triangular - 33 Gal  *( Item 70957)

* Inlet and Outlet are at the center and opposite. ** Inlet at the center , Outlet at the corner and opposite. *** Inlet at the narrow part of the triangle and outlet at the bottom part same side.

The Plastimo high resistance flexible water tanks are a reliable, practical and low cost solution to the storage of fresh water on board. They are flexible, light and form-fitting, and can therefore be installed where it would not be possible to install a rigid water tank, due to the shape of the boat or difficult access.

The double envelope principle makes maintenance easy, as the inner chamber can be easily removed from the outer envelope for routine cleaning and examination

BISPHENOL A FREE PHTALATE - FREE 

The double envelope principle (food-compatible PVC water chamber) makes maintenance easy : the inner chamber can be easily removed from the outer envelope for routine cleaning and examination. Water tanks are supplied complete, ready to install, with Ø 38 mm inlet fitting and Ø 12 mm outlet .

• Ø 38 mm inlet fitting is situated on upper side of tank 
• Ø 12 mm fitting valve is situated on underneath side of tank  (except on triangular model ( 2 version) : inlet and outlet are both on same side of tank on item 16658, item 26957 has on opposite side).
• Height of tanks, when filled to capacity : 25 cm. ~ 10"
• 1" = 2.54cm

  IMPORTANT : When mount the inlet and outlet use PTFE Thread Seal Tape Part number P131212010 to avoid leaks. Only use your hands pressure to tight the fittings.

• Tags : 13 Gallons Water Tank 200 liters 26 Gallons Water Tank 33 gal water tank 40 Gallons Water Tank 52 gallons water tank Flexible Water Tank Plastimo Sailboat Hardware Water Tank

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Plastimo Flexible Water Tank

The Plastimo high resistance flexible water tanks are a reliable, practical and low cost solution to the storage of fresh water on board. They are flexible, light and form-fitting, and can therefore be installed where it would not be possible to install a rigid water tank, due to the shape of the boat or difficult access. Water tanks are supplied complete, ready to install, with  38 mm inlet fitting and  12 mm outlet valves.

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Custom Plastic Marine Water Tanks and Marine Waste Holding Tanks (Freshwater, Grey Water & Wastewater)

At Miller Plastic Products, we manufacture custom marine water tanks to suit a variety of needs and applications. Many larger boats have a clean water system and a wastewater system. Clean water is also known as potable or fresh water; Wastewater is known as black water or gray water.

If there’s an RV or marine water tank available in stainless steel, or aluminum, we can fabricate the same shape and size container out of lighter-weight plastic materials, including:

Polypropylene PVC Polyethylene

Request a quote for a custom marine holding tank from Miller Plastic Products below. These custom fabricated tanks start at $1,491.

GET A CUSTOM PLASTIC TANK QUOTE

Our experience can help you choose the right material for your particular custom plastic marine water tank, RV tank, or marine waste holding tank. We’re just a phone call or click away.

We offer free design assistance and can provide 2D or 3D drawings using AutoCAD and SOLIDWORKS

Our tanks are engineered using FEA (Finite Element Analysis) to maximize performance and allow for minimal bowing of the fabrication.

We offer a wide selection of custom plastic marine water tanks, marine waste holding tanks, and RV tanks in any size or shape to fit your need. Our tanks can also be heated for use in freezing weather. The kinds of marine tanks we can fabricate to your exact specifications include:

• Bottom Dump Waste Water Tanks
• Recessed End Dump Holding Tanks
• L-Shaped Holding and Water Tanks
• Wastewater Tanks
• Grey Water & Black Water Tanks
• Port and Starboard Tanks
• End Dump Holding Tanks
• Bow Shaped Water Tanks
• Side Dump Holding Tanks
• Fresh Water Tanks
• Holding Tanks
• Bow and Stern

Some of the Materials We Work With Include:

The kinds of plastic tanks we can fabricate to your exact specifications include:

• Waste Water Tanks
• Grey Water Tanks
• Custom Plastic Machining
• Plastic CNC Machining
• Plastic Gear Manufacturer
• Inspection Capabilities
• Annealing Services
• Custom Plastic Fabricators
• Plastic Heat Exchangers
• Laboratory Equipment
• Filtration Systems
• Dosing Skids
• Plastic Fabrication Supplies
• Custom Tanks
• Plastic Plating Tanks
• Pickling Tanks
• Galvanizing Tanks
• Polypropylene Plastic Containers
• Mobile Tanks
• Fire Truck Water Tanks
• Restroom Trailers
• Hydroponics
• Tank Builder
• Custom Pipe & Fittings
• Kynar Fittings
• Pipe Bending
• Polypropylene
• Plastic Industrial Float Valve Products
• Commercial 3D Printing Services
• Fume & Duct Hoods

Marine Water Tanks

• RV & Marine Tanks

Tank-mart is dedicated to providing its customers with the best possible shopping experience. We offer a wide selection of marine water tanks at the best prices. All of our marine water tanks are manufactured from FDA approved resin. These tanks can be used for storing fresh drinkable potable water. Tank-mart’s marine water tanks come with custom fittings installed. Any boat, any vessel, any yacht, Tank-Mart has your water tank.

How to fill out technical drawing

• Qty in Cart

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Name	Capacity	Length	Width	Height	Diameter	Part #	Price
	2 Gallons	9.75''	9.75''	6''	N/A	MW-364	$75.92
	3 Gallons	16.375''	9''	5.25''	N/A	MWB267	$130.95
	3 Gallons	16''	7.5''	6.5''	N/A	MW-49	$90.92
	4 Gallons	17.625''	8.25''	7.875''	N/A	MWB269	$130.95
	5 Gallons	18''	13.5''	7''	N/A	MWB410	$139.95
	5 Gallons	20''	12''	5.5''	N/A	MWB390	$139.95
	5 Gallons	18.5''	9.5''	6.75''	N/A	MWB377	$139.95
	5 Gallons	21''	8.25''	8''	N/A	MWB322	$139.95
	5 Gallons	12.25''	12.25''	8.25''	N/A	MWB268	$130.95
	5 Gallons	18''	17''	4''	N/A	MW-507	$133.92
	5 Gallons	15.5''	15.5''	5''	N/A	MW-77	$118.92
	6 Gallons	27''	13.25''	4.25''	N/A	MWB533	$198.95
	6 Gallons	13.75''	13.75''	10''	N/A	MWB404	$164.95
	6 Gallons	20''	11.5''	7''	N/A	MWB357	$164.95
	6 Gallons	21.625''	14.375''	5.375''	N/A	MWB285	$164.95
	6 Gallons	16''	12''	8''	N/A	MWB277	$164.95
	6 Gallons	16''	12''	8''	N/A	MW-369	$115.92
	6 Gallons	17''	12''	8''	N/A	MW-354	$120.92
	7 Gallons	13''	12''	12''	N/A	MWB535	$130.95
	7 Gallons	27''	14.375''	5''	N/A	MWB395	$164.95
	7 Gallons	21.5''	10''	8.75''	N/A	MWB344	$164.95
	7 Gallons	12''	12''	12''	N/A	MWB326	$130.95
	7 Gallons	27''	10.25''	6.5''	N/A	MWB287	$164.95
	7 Gallons	15.625''	15.125''	7.75''	N/A	MWB275	$164.95
	7 Gallons	24.25''	12.5''	5.75''	N/A	MWB272	$164.95
	7 Gallons	19.25''	13.125''	7.125''	N/A	MWB271	$164.95
	8 Gallons	19.5''	13.5''	7.5''	N/A	W-367	$67.92
	8 Gallons	23.5''	10''	8.5''	N/A	MWB360	$186.95
	8 Gallons	18''	14.625''	10''	N/A	MWB280	$198.95
	8 Gallons	24''	12.25''	6.875''	N/A	MWB270	$186.95
	8 Gallons	18''	11.5''	10''	N/A	MWB186	$186.95
	8 Gallons	Request Drawing	Odd Shape	Call 800 211-7998	N/A	MWB121	$186.95
	7.5 Gallons	26''	11''	7''	N/A	MWB525	$147.95
	8 Gallons	16.75''	14''	10''	N/A	MW-407	$136.92
	8 Gallons	36''	16''	4''	N/A	MW-306	$217.92
	8 Gallons	Request Drawing	Odd Shape	Call 800 211-7998	N/A	B280	$198.95
	9 Gallons	18.5''	17''	7.5''	N/A	MWB532	$186.95
	9 Gallons	19''	15''	9''	N/A	MWB442	$186.95
	9 Gallons	25.5''	10.5''	8.5''	N/A	MWB361	$186.95
	9 Gallons	31''	10.5''	7''	N/A	MWB341	$186.95
	9 Gallons	25''	14.625''	6''	N/A	MWB336	$186.95
	9 Gallons	18''	12.5''	11''	N/A	MWB321	$186.95
	9 Gallons	27''	15''	6''	N/A	MWB304	$186.95
	9 Gallons	32''	15''	5''	N/A	MWB288	$186.95
	9 Gallons	16''	14''	10''	N/A	MWB132	$198.95
	10 Gallons	17''	14''	10''	N/A	TRI-WH-2010	$209.99
	10 Gallons	18''	12''	12''	N/A	MWB560	$198.95
	10 Gallons	26''	11''	11''	N/A	MWB438	$186.95
	10 Gallons	25.25''	12.75''	8''	N/A	MWB389	$198.95
	10 Gallons	17.75''	12.5''	11''	N/A	MWB365	$198.95
	10 Gallons	32''	19.5''	4.75''	N/A	MWB323	$198.95
	10 Gallons	15.375''	13.25''	13.25''	N/A	MWB263	$186.95
	10 Gallons	36''	10''	10''	N/A	MWB217	$198.95
	10 Gallons	22.5''	17''	13''	N/A	MW-490	$197.92
	10 Gallons	35.625''	15.75''	5''	N/A	MW-431	$221.92
	10 Gallons	24''	14.5''	7.5''	N/A	MW-53	$165.92
	10 Gallons	19.25''	13''	9.5''	N/A	MW-26	$141.92
	10 Gallons	18''	16''	8''	N/A	ML-1	$144.92
	10 Gallons	54''	7''	6''	N/A	MW-376	$258.92
	11 Gallons	17''	16''	11''	N/A	MWB375	$220.95
	11 Gallons	35''	19.5''	4.75''	N/A	MWB319	$198.95
	11 Gallons	15.375''	13.5''	13.5''	N/A	MWB286	$186.95
	11 Gallons	19''	12''	12''	N/A	MW-498	$122.92
	11 Gallons	17.25''	12.25''	12.25''	N/A	MW-491	$119.92
	11 Gallons	24''	15.5''	8''	N/A	MW-210	$174.92
	12 Gallons	24''	15''	10''	N/A	W-370	$87.92
	12 Gallons	24''	13.5''	10''	N/A	MWB548	$213.95
	12 Gallons	14.75"	14.75"	14.25''	N/A	MWB441	$213.95
	12 Gallons	23''	11.5''	11.5''	N/A	MWB279	$213.95
	12 Gallons	17''	17''	11''	N/A	MWB255	$213.95
	12 Gallons	20''	12''	12''	N/A	MWB124	$213.95
	12 Gallons	17.5''	14''	12''	N/A	MWB105	$213.95
	12 Gallons	24''	16''	8''	N/A	ML-2	$176.92
	13 Gallons	22''	19.5''	14.75''	N/A	W-415	$227.92
	13 Gallons	18.25''	14.375''	13.125''	N/A	MWB266	$213.95
	13 Gallons	15.875''	15.125''	14.5''	N/A	MWB262	$213.95
	13 Gallons	48''	10''	9''	N/A	MWB218	$213.95
	13 Gallons	30''	14''	8.25''	N/A	MW-28	$198.92
	14 Gallons	20''	14''	11.75''	N/A	TRI-WH-2014-1	$229.99
	14 Gallons	24''	14''	10''	N/A	TRI-WH-2014	$229.99
	14 Gallons	16.875''	15.75''	14''	N/A	MWB534	$269.95
	14 Gallons	15.625''	15.625''	15.125''	N/A	MWB274	$213.95
	14 Gallons	17.5''	14.5''	14.25''	N/A	MWB265	$213.95
	14 Gallons	24.5''	16.5''	9.125''	N/A	MWB245	$213.95
	14 Gallons	19.375''	16.5''	10.125''	N/A	MW-495	$144.92
	15 Gallons	19''	18''	9.75''	N/A	TRI-WH-2015	$232.99
	15 Gallons	36''	13.5''	7.5''	N/A	W-366	$98.92
	15 Gallons	30.25''	30.25''	11.75''	N/A	MWB492	$213.95
	15 Gallons	24''	18.5''	8.5''	N/A	MWB388	$213.95
	15 Gallons	17.5''	16.75''	13.75''	N/A	MWB320	$213.95
	15 Gallons	22''	17''	9.875''	N/A	MWB264	$213.95
	15 Gallons	27.5''	14.75''	9.5''	N/A	MWB251	$213.95
	15 Gallons	20''	13''	13''	N/A	MWB175	$213.95
	15 Gallons	20''	15''	12''	N/A	MWB131	$213.95
	15 Gallons	19''	16''	12''	N/A	MW-489	$166.92
	15 Gallons	17.75''	14.75''	14.75''	N/A	MW-355	$163.92
	15 Gallons	48.5''	10.75''	7.875''	N/A	MW-328-OR	$274.92
	15 Gallons	23''	16''	11''	N/A	MW-327-OR	$185.92
	15 Gallons	30''	16''	8''	N/A	ML-3	$209.92
	16 Gallons	15''	25.25''	13''	N/A	W-361	$92.92

2 Gallon Marine Water Tank | MW-364

Custom Roto

3 Gallon Marine Water Tank | MWB267

Ronco Plastics

3 Gallon Marine Water Tank | MW-49

4 Gallon Marine Water Tank | MWB269

5 Gallon Marine Water Tank | MWB410

5 Gallon Marine Water Tank | MWB390

5 Gallon Marine Water Tank | MWB377

5 Gallon Marine Water Tank | MWB322

5 Gallon Marine Water Tank | MWB268

5 Gallon Marine Water Tank | MW-507

5 Gallon Marine Water Tank | MW-77

6 Gallon Marine Water Tank | MWB533

6 Gallon Marine Water Tank | MWB404

6 Gallon Marine Water Tank | MWB357

6 Gallon Marine Water Tank | MWB285

6 Gallon Marine Water Tank | MWB277

6 Gallon Marine Water Tank | MW-369

6 Gallon Marine Water Tank | MW-354

7 Gallon Marine Water Tank | MWB535

7 Gallon Marine Water Tank | MWB395

7 Gallon Marine Water Tank | MWB344

7 Gallon Marine Water Tank | MWB326

7 Gallon Marine Water Tank | MWB287

7 Gallon Marine Water Tank | MWB275

7 Gallon Marine Water Tank | MWB272

7 Gallon Marine Water Tank | MWB271

8 Gallon Bow Shaped Water Tank | W-367

8 Gallon Marine Water Tank | MWB360

8 Gallon Marine Water Tank | MWB280

8 Gallon Marine Water Tank | MWB270

8 Gallon Marine Water Tank | MWB186

8 Gallon Marine Water Tank | MWB121

7.5 Gallon Marine Water Tank | MWB525

8 Gallon Marine Water Tank | MW-407

8 Gallon Marine Water Tank | MW-306

8 Gallon Rectangle Plastic Tank | B280

9 Gallon Marine Water Tank | MWB532

9 Gallon Marine Water Tank | MWB442

9 Gallon Marine Water Tank | MWB361

9 Gallon Marine Water Tank | MWB341

9 Gallon Marine Water Tank | MWB336

9 Gallon Marine Water Tank | MWB321

9 Gallon Marine Water Tank | MWB304

9 Gallon Marine Water Tank | MWB288

9 Gallon Marine Water Tank | MWB132

10 Gallon Water or Waste Holding Tank | TRI-WH-2010

10 Gallon Marine Water Tank | MWB560

10 Gallon Marine Water Tank | MWB438

10 Gallon Marine Water Tank | MWB389

10 Gallon Marine Water Tank | MWB365

10 Gallon Marine Water Tank | MWB323

10 Gallon Marine Water Tank | MWB263

10 Gallon Marine Water Tank | MWB217

10 Gallon Marine Water Tank | MW-490

10 Gallon Marine Water Tank | MW-431

10 Gallon Marine Water Tank | MW-53

10 Gallon Marine Water Tank | MW-26

10 Gallon Marine Water Tank | ML-1

10 Gallon Marine Water Tank | MW-376

11 Gallon Marine Water Tank | MWB375

11 Gallon Marine Water Tank | MWB319

11 Gallon Marine Water Tank | MWB286

11 Gallon Marine Water Tank | MW-498

11 Gallon Marine Water Tank | MW-491

11 Gallon Marine Water Tank | MW-210

12 Gallon Bow Shaped Water Tank | W-370

12 Gallon Marine Water Tank | MWB548

12 Gallon Marine Water Tank | MWB441

12 Gallon Marine Water Tank | MWB279

12 Gallon Marine Water Tank | MWB255

12 Gallon Marine Water Tank | MWB124

12 Gallon Marine Water Tank | MWB105

12 Gallon Marine Water Tank | ML-2

13 Gallon Bow Shaped Water Tank | W-415

13 Gallon Marine Water Tank | MWB266

13 Gallon Marine Water Tank | MWB262

13 Gallon Marine Water Tank | MWB218

13 Gallon Marine Water Tank | MW-28

14 Gallon Water or Waste Holding Tank | TRI-WH-2014-1

14 Gallon Water or Waste Holding Tank | TRI-WH-2014

14 Gallon Marine Water Tank | MWB534

14 Gallon Marine Water Tank | MWB274

14 Gallon Marine Water Tank | MWB265

14 Gallon Marine Water Tank | MWB245

14 Gallon Marine Water Tank | MW-495

15 Gallon Water or Waste Holding Tank | TRI-WH-2015

15 Gallon Bow Shaped Water Tank | W-366

15 Gallon Marine Water Tank | MWB492

15 Gallon Marine Water Tank | MWB388

15 Gallon Marine Water Tank | MWB320

15 Gallon Marine Water Tank | MWB264

15 Gallon Marine Water Tank | MWB251

15 Gallon Marine Water Tank | MWB175

15 Gallon Marine Water Tank | MWB131

15 Gallon Marine Water Tank | MW-489

15 Gallon Marine Water Tank | MW-355

15 Gallon Marine Water Tank | MW-328-OR

15 Gallon Marine Water Tank | MW-327-OR

15 Gallon Marine Water Tank | ML-3

16 Gallon Bow Shaped Water Tank | W-361

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How To Clean Sailboat Water Tanks? (An Easy Guide)

As a sailboat owner, having access to clean, fresh water is essential.

But how do you ensure that your sailboat water tanks are clean and safe to use? Fortunately, cleaning your sailboat water tanks is a straightforward process.

In this article, we’ll walk you through the basics of how to clean your sailboat water tanks, from why it’s essential to do so to the steps involved in sanitizing the tank.

Let’s get started!

Table of Contents

Short Answer

To clean sailboat water tanks, the first step is to empty the tank and rinse it with fresh water.

Next, mix a solution of 1 cup of bleach and 1 gallon of water and pour it into the tank.

Allow the solution to sit in the tank for 1-2 hours and then rinse the tank thoroughly with fresh water.

Finally, use a brush to scrub the inside of the tank and rinse it again with fresh water before refilling.

Why Cleaning Sailboat Water Tanks is Essential

Cleaning the water tanks of a sailboat is essential for a number of reasons.

Not only does it ensure that the water being stored is safe for use, but it can also help protect the tank itself from damage caused by contaminants, algae, and bacteria.

In addition, regular cleaning and maintenance can help the tanks last longer and remain in good condition.

Without proper cleaning, the tanks can become corroded, contaminated, and clogged, leading to costly repairs.

In short, cleaning the water tanks of a sailboat is essential to ensure that the water stored is safe to use, and to ensure the longevity of the tanks.

Preparing the Sanitizing Solution

When it comes to cleaning the water tanks of a sailboat, the most important part of the process is to create a sanitizing solution.

To do this, you need to mix two parts hot water with one part bleach.

This mixture should be stirred until the bleach is completely dissolved in the water.

Once this is done, the solution is ready to be used.

It is best to use hot water for the solution, as the heat helps the bleach to break down any bacteria and other contaminants in the tank.

Additionally, this solution should be made fresh each time you clean the tank, as the bleach in the solution can break down over time and become less effective.

It is also important to use a gentle bleach, as stronger versions can cause damage to the tank.

Once the solution is prepared, its time to move on to the next step of the process.

Filling the Tank with the Solution

When it comes to cleaning the water tanks of a sailboat, filling the tank with the sanitizing solution is one of the most important steps.

To create the sanitizing solution, mix two parts hot water with one part bleach and stir until the mixture is completely dissolved.

Once the solution is ready, fill the tank with the mixture and let it sit for at least 24 hours.

This will give the bleach enough time to effectively sanitize the tank and kill any bacteria or contaminants that could be present.

It is important to make sure that the solution is distributed evenly throughout the tank, as this will ensure that all areas of the tank are properly sanitized.

Additionally, make sure that the solution is not too concentrated, as this could be potentially harmful to the surrounding environment.

Once the solution is in the tank, let it sit for at least 24 hours before proceeding to the next step.

Letting the Solution Sit for 24 Hours

When it comes to cleaning sailboat water tanks, allowing the sanitizing solution to sit for at least 24 hours is of the utmost importance in ensuring that the water stored is safe for use.

During this period, the bleach works to break down any harmful bacteria or other contaminants that may be present.

It is important to note that the tank should be kept sealed during this time to ensure that the solution can properly sanitize the tank.

If the tank is not sealed, the solution may evaporate before it can do its job.

During this period, it is a good idea to periodically check the solution and add more if necessary.

Also, it is important to make sure that the temperature of the solution does not drop too much, as this can reduce its effectiveness.

Therefore, it is best to store the tank in a sheltered area with an ambient temperature that is not too far off from the temperature of the solution.

This will help to ensure that the bleach is able to do its job properly.

After the solution has sat for the requisite 24 hours, it is time to empty the tank and rinse it thoroughly with fresh water.

This will help to ensure that any residual bleach is removed, thus making it safe for use.

It is also a good idea to use a brush to scrub the inside walls of the tank before rinsing it, as this will help to remove any remaining dirt or debris.

Doing this will help to ensure that the tank is properly sanitized and safe for use.

Emptying the Tank

Emptying the tank is an important step in the process of cleaning sailboat water tanks.

To do this, start by turning off the power to the tank.

Then, open the valve on the tank and allow all the water to drain out.

It is important to ensure that all the water is completely drained before moving on to the next step.

If any water remains in the tank, it will be difficult to clean it properly.

Once the tank is empty, close the valve and disconnect any hoses or pipes connected to the tank.

This will help prevent any of the sanitizing solution from entering the plumbing of the boat.

Finally, make sure to open the tank access port and allow any remaining air to escape.

Once complete, the tank is now ready to be filled with the sanitizing solution.

Rinsing the Tank

Once the tank has been filled with the sanitizing solution and left to sit for at least 24 hours, it is time to rinse it out.

This step is essential to ensure all of the solution has been washed away and the tank is safe to use.

The best way to do this is to use fresh water and a hose or faucet.

Make sure to get all of the corners and crevices of the tank, as this is where bacteria can hide and thrive.

Be sure to rinse the tank until there is no more chlorine smell present, as this is a good indication that the solution has been washed away.

Once the tank has been rinsed, it is ready to be scrubbed and sanitized.

Scrubbing the Inside with a Brush

Once youve filled the tank with the sanitizing solution and allowed it to sit for at least 24 hours, the next step is to empty the tank and rinse it thoroughly with fresh water.

After this is done, youll need to take a brush and scrub the inside of the tank.

This is important as it will help to remove any residue that may have been left behind after the sanitizing solution has done its job.

Its best to use a brush specifically designed for cleaning sailboat water tanks, as this will help to ensure that no damage is done to the inside of the tank.

When scrubbing, make sure to get into all the nooks and crannies of the tank, as this is where bacteria can hide and build up.

Youll want to move the brush in a circular motion to help dislodge any residue that may be stuck to the walls.

Be sure to also scrub the lid of the tank, as this is a place where bacteria can often hide.

Finally, rinse the tank thoroughly with fresh water after scrubbing to remove any remaining residue.

By following these steps, you can ensure that your sailboat water tanks are properly sanitized and safe to use.

Cleaning the tanks periodically will help to prevent any buildup of bacteria and keep your water safe and free from contamination.

Final Thoughts

Cleaning the water tanks of a sailboat is an essential task that must be done periodically to ensure that the water stored is safe to use.

By following the steps outlined above, you can easily and effectively clean your sailboat water tanks.

So the next time you find yourself needing to give your water tanks a good clean, remember the steps outlined here and you’ll be sure to have safe and clean tanks in no time.

James Frami

At the age of 15, he and four other friends from his neighborhood constructed their first boat. He has been sailing for almost 30 years and has a wealth of knowledge that he wants to share with others.

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Waste & Water Tanks

All marine holding tanks, waste tanks, water tanks and fresh water tanks are made to order..

Our wide variety of marine tank shapes and sizes can be sorted through using our tank finder  below. All fresh water tanks and holding tanks used for marine sanitation are roto-molded polyethylene without seams making for a strong tank that will not split allowing for a more reliable container for your fresh water or sanitation needs. All fill and out flow fittings will be installed to your specifications making sure that it will match up to your requirements.

How to Search for a Tank

Start by choosing the shape of the holding tank or water tank based on the location it needs to fit into. Next insert the dimensions. You may also insert a specified amount of gallons. Our tank finder will sort our large inventory of tanks and come up with a number of suggestions.

Utilize the search boxes below to start your search and if the tank size you are looking for doesn’t come up give us a call at +1 (401) 683-4434 or e-mail us at [email protected] and we can talk with you about a custom built tank.

Our Tank Selection Guide

Tank Number must be preceded with " " " " for Waste & Water Tanks or " " or " " for Fuel Tanks*

tanks are Diesel Tanks

Rectangular Tanks

Largest Measurement	Middle Measurement	Smallest Measurement

Side tanks are shaped to fit along the side of the yacht. Many people find a spot under a settee which is perfect for a side tank. When selecting a side tank, be sure to check for “handedness”, some fit better port or starboard

Other Tanks

Other tanks are oddball shapes with funny notches and cutouts. While hard to categorize, you may find one that’s perfect.

Tank Measuring Guide for Waste & Water Tanks

DOWNLOAD OUR TANK MEASURING GUIDE HERE

To measure for a bow tank, attach a string fore and aft in the compartment at the height that you think the top of the tank should be. Next, at three inch intervals along the string measure the depth of the compartment. Using the same three-inch intervals measure the width of the compartment. Now you will have some data to use when looking at the list of tanks. You can use the same method in reverse if you have the dimensions of a tank. Set the string at the tank height and make sure all of the boat’s dimensions are larger than the tank’s. If the space is too close to call, then make a cardboard mock up of the tank and see if it will fit. Finally check to see that the tank will fit down the hatch and into the tank bed!

Pick up your phone and order the tank right away, call: +1 (401) 683-4434

Start at the deep side of the space and determine the height. Then measure the width of the space at the forward end and try to make a reference line on the bulkhead. Now measure the depth of the space every three inches along the reference line. Take the same measurements at the aft end of the space. Now with your data check to see which tanks will fit. When you select a tank double-check the tank measurements in the boat. Check to see that your tank will fit through companionway to its final resting-place.

Now run, don’t walk to a phone and order the tank, call: +1 (401) 683-4434

Measure the longest dimension first then the other two lengths. All the rectangular tanks are listed with the long side first. Often it is easier to partition an odd shaped space and put in a rectangular tank or two, than trying to fit and odd shaped tank into an odder shaped space. Especially when you need to put in a platform for the tank to sit on.

Once you have selected the tank call me A.S.A.P. with your tank order. +1 (401) 683-4434

IF ALL ELSE FAILS Get a tape measure, a cell phone, a pencil, a pad, some string, some scotch tape, and my phone number. Go down to the boat and we’ll chat. +1 (401) 683-4434 .

Tank Fittings

Discharge Fittings (waste)

We use dip tubes for discharge, they can be located on the top side or the top of a vertical side. Dip tubes are 1.5″ female pipe thread and will accept straight or 90-degree pipe to hose adapters. Dip tubes extend down to the bottom of the tank. You will need 4.5″ of clearance from the sidewall of the tank for our standard fittings and 2.75″ for our low profile fittings.

Inlet and Vent fittings

Inlet and vent fittings can be located on the top or the top of a vertical side of the tank. The inlet fitting is 1.5″ female pipe thread and the vent can be .5″ or .75″ female pipe thread. The inlet fitting requires 4.5″ of clearance from the sidewall of the tank for a 90-degree fitting. Vent fittings require 2″ of clearance for .5″ 90 degree fittings and 2.25″ of clearance for .75″ fittings off the sidewall of the tank.

Suction Fittings (water tanks)

Suction fittings can be at the bottom of the tank or the bottom of a sidewall of the tank. Suction fittings can be .5″, .75″, or 1″.

Waste and Water Tank Ordering Instructions

Before you order your waste/water tank make sure you have completed the following items:

• Select the tank that you would like by choosing an OLT #
• Complete a diagram on how you would like to have the tank set up depicting the exact locations of FPT fittings and dip tubes. You can use the schematic for the tank you are ordering from the web page and add the fitting locations.
• Select the proper fittings or dip tubes from our web store, based on what is on your drawing, and added them to your shopping cart.
• Check the shopping cart and made sure that all items are accounted for and billing and shipping information is correct.
• Fax or email us a copy of your diagram so that we can build the tank to your specifications, again this is very important because all sales are final there are no returns on tanks.

FOLLOWING THESE STEPS IS VERY IMPORTANT BECAUSE ALL TANKS ARE BUILT TO ORDER THERE ARE NO RETURNS ON TANKS

Product Categories

Store search, site search, if you are ordering a waste water tank.

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Boat Water Tanks

Featured Brands

Whether you are in the open sea for a day or a week, a boat water tank is exactly what you need to make your trip comfortable. It is an important unit that provides storage of water for use in different applications. It should be maintained regularly to ensure there is no toxic buildup of bacteria and viruses. The tank can be used in various types of vessels, such as yachts, deep-sea fishing boats, sailboats, and others. It should also be drained of any water or waste when you prepare your boat for off-season storage in order to prevent damages caused by low or high temperatures.

At BOATiD, we are proud to offer a wide range of cutting-edge products, including boat water tanks, pumps, tank monitors, sensors, hoses, fittings, and more expertly manufactured by a variety of top brands such as Groco, Seachoice, Todd, Jabsco, Nauta, and others. Made from high-quality materials that meet strict industry requirements, they deliver a long service life and unmatched dependability while being competitively priced to fit your budget. Thoroughly checked and tested, all products we store can handle any extreme conditions. Engineered with utmost attention to every detail, they will definitely cater to all your needs and preferences.

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Boat Holding and Waste Tanks

Whether on the water in your boat or on the road in your motorhome, quality holding tanks and holding tank systems are essential to your plumbing system. Polyethylene tanks are sturdy, keeping wastewater (black water and gray water) where it belongs: out of sight (and smell). Check out Great Lakes Skipper's amazing discount prices on marine waste tanks and holding tanks, hoses, holding tank monitors, and more wastewater tanks, holding tank components and accessories by Bayliner, Raritan, MPI, Dometic, and more top brands.

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