sailboat water heater 12v

About this item

• Quickly and efficiently heats water and maintains hot water for up to 10 hours
• Ideal for use with deck showers and for warming wetsuits
• Efficient 300 W heating element delivers outstanding performance for 3-gallon-capacity Water Heater
• Includes an integrated temperature and pressure relief valve
• Conveniently uses 12 V D.C. power supply so there’s no need for a generator, inverter, or shore power
• Installs in compact spaces such as under seating, in the galley or transom
• Durable epoxy-coated aluminum case; measures 13-1/2 inches W x 14-1/2 inches D x 13-1/4 inches H

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What makes Attwood different:

• A proven marine industry leader for over 100 years.
• Wide range of products, including general marine accessories, seat & table hardware, and water systems & ventilation.
• Tested to the highest USCG, ABYC, and CE standards.
• Quality is our highest priority.

Why Attwood?

The Attwood Promise

Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing of quality boating/marine products for over 100 years. We provide genuine OEM replacement parts delivering safe and reliable lighting, fuel systems, water systems, seating & pedestals, and general marine accessories that are easy to install and meet regulatory compliance.

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• 5 star 4 star 3 star 2 star 1 star 3 star 76% 7% 8% 0% 9% 8%
• 5 star 4 star 3 star 2 star 1 star 2 star 76% 7% 8% 0% 9% 0%
• 5 star 4 star 3 star 2 star 1 star 1 star 76% 7% 8% 0% 9% 9%

Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.

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Customers say

Customers like the functionality, ease of installation, and value of the water heater. They mention it works well, heats super fast, and provides very hot water. However, some dislike that it leaks.

AI-generated from the text of customer reviews

Customers like the functionality of the water heater. They mention it's easy to install and works well.

" Works great ! Fit in boat like it should!" Read more

" Seems great , switched over, hokeboattern different, but not too bad, was suprised to learn whale is part of Atwood...." Read more

"...This one works like a champ ! Easy install too." Read more

" Worked perfect " Read more

Customers find the installation of the water heater easy. They mention it's an exact replacement and goes in without any issues.

"...There is nothing difficult to changing these out , unless your getting old like me and bending and stretching into the depths of hidden places where..." Read more

"...This one works like a champ! Easy install too ." Read more

"...This 6 gallon was easy to install and everything matched up." Read more

"Replacement for 25 year old boat heater installed easily and works well." Read more

Customers are satisfied with the water heater. They mention it's a great product and provides very hot water.

"This unit is perfect for us, supplying hot water on our sailboat , using solar to supply the power needed." Read more

"Works great, very hot water . Just wish I could turn the temperature down a little bit!" Read more

"...from my old one, so installation was plug and play, very good and heats super fast !!" Read more

"Works as advertised. Easy to install now have plenty of hot water ." Read more

Customers appreciate the value of the water heater. They mention it's a great value.

"...the new was the exact dims. of the old. I was very pleased with the price and very short shipping time (Great Job )...." Read more

"... Great value " Read more

"This is a very good price for this unit. It is exactly like the original I am replacing from the factory (12 years ago)...." Read more

"Its a nice heater for the price . For extra life i inserted the Zinc pencil,your able to order from the manufactuer." Read more

Customers are satisfied with the fit of the water heater. They mention it's a perfect fit.

"Works great! Fit in boat like it should !" Read more

"Purchased this unit to replace a Atwood ehm6-ms water heater, the fit was perfect . Great value" Read more

"The Water heater has been installed, fit perfectly and provides very hot water. Perfect" Read more

" Perfect fit " Read more

Customers are satisfied with the replacement value of the water heater. They mention it's an excellent replacement for original equipment and an excellent choice.

" Excellent replacement for 1986 boat water heater . Only had to make modifications to hose lengths." Read more

"Easy to install and exact replacement ..." Read more

" Excellent replacement for original equipment on a Catalina..." Read more

Customers are dissatisfied with the leakage of the water heater. They mention that the heat exchanger leaks and the water is still dripping.

"This is a great water heater in my RV. Brand new in July 2024. The P/T valve leaks . I have done everything I could think of but still leaks...." Read more

" Coolant line leaks at first time try . And seller not receiving any phone calls for warranty repair." Read more

"...heater on March 29, 2017 it's now April 6, 2018 and it's leaking a steady fountain of water out of the heat exchanger...." Read more

" Heat exchanger leaked !" Read more

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The Best Marine Water Heaters for Your Boat or RV

Written by J. Harvey / Fact checked by S. Numbers

A boat is a pricey investment just like your house. Therefore, it’s natural that you give it the same amount of attention. Equivalent to furnishing your house is getting the right and quality accessories for your boat, of which includes the best marine water heater.

Warm or hot water is essential when sailing as you utilize it for showering and washing up. Just make sure that you get the right heater size so that you can optimize the usage and performance. Unlike residential heaters, marine water heaters don’t consume a lot of energy.

There are numerous marine hot water heaters that you can find. You can avoid confusion by reading this comprehensive review so you’ll be oriented with the important features. Consequently, you can select the most suitable for your boat.

• Works with solar power
• Provides hot water in 5 minutes
• Easy installation

• Doubles the supply of hot water
• Has good-quality parts
• High-quality construction

• Durable 
• Has 2-year warranty

Table of Contents

1. Whale Premium Water Heater

2. kuuma 11g 120v front exchanger, 3. whale premium water heater capacity, 4. kuuma water heater rear heat exchanger, 5. bosch 7738004996 electric water heater, 6. ecosmart eco mini electric heater, 7. kuuma 120v 6 gallon water heater, 8. whale f700 water heater, 9. bosch es8 tronic 3000 t water heater, 10. whale 68954 seaward hot water heater, 11. suburban 52747a water heater, 12. whale seaward zxc-f600wcwe water heater, factors to consider when choosing marine water heaters, what is the marine water heater, who makes the best marine water heater, how to install a marine water heater, which water heater is better rheem or ao smith, best marine water heater reviews.

You’ll find this product from Whale which is a part of Attwood in several marine water heater reviews due to its dependability. It’s an efficient hot water supplier in my sailboat. I sometimes use solar power to make it work.

When it’s time to take a shower, I only need to wait for 5 minutes to get warm water. That’s why I call it an instant heater! Aside from quickly turning water hot, it can supply you with plenty of it. To prevent water from becoming scalding hot, I added an automatic thermostatic mixing valve to the outlet.

The installation is easy as I mounted it horizontally. It’s like doing plug and play as everything is a match. No tiresome process is required before reaping benefits from this 6-gallon heater that only requires 120V. It’s a relatively compact water heater. Thus, you don’t need a lot of space for it.

• Produces plenty of water supply
• Easy installation or horizontal mounting
• Compact so it take up a lot of space
• Durable because of its premium components
• Adding automatic thermostatic mixing valve to the outlet so that water won’t be scalding hot

Due to this quick marine water heater, the supply of hot water in my boat doubled. It’s lightweight with fiberglass sheets for insulation. This design allows me to remove the case to minimize the space that it occupies.

I was happy that I am able to connect it to the freshwater cooling system of the boat’s engine. Water heating can be done with 110V AC when the engine is not running. However, it’s recommended to fill and cap the pipe with antifreeze when you let it run with AC.

You’ll find black, white, and green wires that have good quality. If you have the same wires in your boat, it’s easy to connect them. Installation is manageable in my case. I figured out what to do after I saw the parts. It has a nice recirculation system that works in producing hot and cold water.

• Lightweight and space saver by removing the case
• Can be connected to the freshwater cooling system of the boat’s engine
• Has good quality parts
• Has a recirculation system for hot and cold water
• Durable due to its high-quality construction
• Needs antifreeze in the pipes when connected to 110V AC

With the 11 gallon capacity of this water heater, I have enough hot water onboard whenever I need it. I think that Whale is a part of Attwood company as the two-year warranty card is addressed to the latter.

It’s a great replacement for my previous heater even though it’s a tad bit larger. Luckily, the plates can be flattened against the case to make some room. This results in decreasing the depth. Although it’s another task, installation is fairly easy. Screwing down plates and horizontal mounting is not that difficult.

Operating this heater starts with 120 volts or 220 volts. It’s flexible when connecting to power sources as it has extra ports. Thus, there are options for you to plug it into the engine coolant or run off the heat engine. The second alternative works even though the boat is underway and it functions without the help of a generator.

• Provide enough supply of hot water onboard
• Fairly easy installation
• Has extra ports for different power sources
• Durable due to rugged construction
• Ignition is protection to prevent harm and accident
• Has plates that may be a tad bit larger than the designated place
• Water turns hot after 45 minutes

Since the exterior shell of this is composed of marine-grade aluminum, it can last for several years. As I’ve used it for a year with no issues, it’s much better than the other one. I didn’t have to make adjustments as its measurement is similar to my previous water heater.

This has a 6-gallon capacity that never fails to provide the necessary amount of hot water. Thanks to its large diameter and 1,500W heating element! There are other features that I like about it. A high-temperature limiter is present and it has an automatic reset. Also, the circuitry is ignition protected for safe operation.

The heat exchange barbs are found at the back while the fittings and connections are in the front. Installation is relatively easy so I didn’t have to spend a lot of time when going through all the steps. This heater can start working through AC power or engine heat when your vessel is underway.

• Composed of marine-grade aluminum to last for several years
• Provides enough hot water due to 1,500W heating element
• With temperature limiter and automatic reset feature
• The circuitry is ignition protected for safety
• Relatively easy installation
• Works with AC power and engine heat
• Capping off the heat exchanger with anti-freeze so it can supply the needed amount of hot water

Although this is a mini-tank water heater, it has a number of great features. First and foremost, it’s capable of giving off instant hot water as it can maintain the high temperature. It fascinates me because I don’t need to wait for even a single minute. The warmth is good enough for my outdoor showers. I also use it when washing dishes.

It stands out when it comes to the quantity of hot water. Five to seven gallons can be obtained at 98 degrees Fahrenheit.

Be aware that it may be too hot at first and may likely be so for the first gallon. Despite this minor drawback, it can serve two sinks without compromising performance. Also, the recovery rate is fast. With these abilities, I can say that it’s perfect for heating water from distant faucets.

Since this is tankless, the mounting options are not limited. You may place it on the wall, shelf, or floor. In any way you do it, it will always be easy because of its size. The same reason helps me avoid wasting water as I only get what I need. Just like any other RV marine electric tankless water heater, this saves energy as you only heat the water when necessary.

• Gives hot water in an instant even for two faucets at the same time
• Can provide five to seven gallons of hot water
• With a fast recovery rate
• Mounting options are not a limited and easy installation
• Separate warranties for the unit and the parts
• Makes you save water and energy
• The first gallon of water may be too hot

I read some marine hot water heater reviews which convinced me to buy this item. The efficacy of this equipment is not only for household use but onboard as well. Eventually, I wasn’t disappointed. I only need to count seconds to have hot water. Moreover, the performance remains incredible even with a distant faucet.

When onboard, I need hot water to complete menial tasks and quick washing. As such, this heater is a reliable companion. Even my boat bidet with a sprayer became functional because enough supply of warm water came out of it. What’s even better is that this mini tank can give you both hot and warm water.

I like that it’s compact and lightweight with a sleek design and a temperature display. The size of this tank reminds me of a toaster oven. It has pretty good insulation so no energy is wasted. Plug it into a 110-volt outlet and it will start working.

• Heats water in a matter of seconds
• Works on a distant faucet
• Gives water instantly so perfect for quick washing and simple tasks
• Can provide both hot and warm water
• Compact and lightweight with a sleek design and a temperature display
• Has good insulation to not waste energy
• Need to add couplers and tape to secure the connection

Water heaters made by Kuuma are known for their durability. They are made of aluminum to ensure that you can use them for many years. So, I didn’t think too hard before buying this one. My hunch was right as it turned out to be the perfect replacement for the previous heater in my 1985 O’Day 28 sailboat. I’m enthralled by how it perfectly fits into the cockpit locker due to its side mount feature.

Hot water when cruising the vast sea can be both a necessity and a luxury. Thus, I was prompted to get this heater with great abilities. There are two ways to heat water due to its dual-loop feature. It can be done through the boat’s engine and shore power. When the vessel is underway, you can connect it to AC power. You may even use raw power heating.

It also promotes safe operation, especially for gasoline-powered boats. The credit goes to the circuitry that is ignition protected. There’s a limit to high temperatures and an automatic reset. Hence, you won’t be surprised with scalding hot water. Quick recovery is another wonderful ability from its 1,500W heating element.

• Durable and lasts for many years
• Suits old model vessels
• Works with different power sources
• Promotes safety operation
• Quick recovery of hot water
• Uncomplicated installation
• Separately buying the necessary hardware

The need to have a huge supply of hot water made me buy this product. You can get 6 gallons or 23 liters from it. It has a thermostat that regulates the electric heating element while it can also produce cold water if you need it.

When heating water, it can reach a temperature of 140 degrees Fahrenheit. But with the temperature-pressure relief valve, the water can’t get too hot. A bilge pump is also added to stop electricity sparks. Since it can dispense both hot and cold water, its design includes waste management.

You can rely on its durability as the inner tank is composed of aluminum and the exterior is of marine-grade stainless steel. These materials guarantee long-term service and strength to face the rigors of the marine environment. That’s why the manufacturer has the confidence to give a two-year warranty to all users.

The double-walled construction is also great as it protects the freshwater supply from contamination. Thus, I don’t worry too much about the water that I keep in my boat.

It’s convenient to just focus on the same area when working on the tank since the fittings and heat exchanger barbs are all situated in the front. Therefore, both the installation and marine hot water heater troubleshooting are easy. Hold-down brackets complete the horizontal mounting of this heater and it’s done with no troubles.

• Contains a huge supply of hot or cold water
• Has parts for safe operation, waste management, and prevention of contamination
• Durable for long-term service
• Has a two-year warranty
• Easy installation and troubleshooting
• Hot water retention for 10 hours
• Very first water release is too hot

I like this product very much as it’s an effective marine tankless water heater. In just 35 minutes, the entire tank of 7 gallons is filled with hot water! Using it gives me so much ease and convenience. I don’t have to turn it on again and again as the water stays hot.

Installation is super easy since it’s substantially hardwired. I think everyone can do it with no difficulty at all. It can also produce cold water. You may mount it horizontally and vertically. But make sure to prepare enough space for it as it’s not exactly mini. Still, you have the freedom to put it on the wall or the floor.

I mounted it with PEX and once it’s done, hot water came out in just 9 seconds. Thus, it’s right to say that it heats up quickly. The temperature that it handles ranges from 65 to 145 degrees Fahrenheit. I can customize the temperature of hot water as there’s a thermostat swing.

• Can make 7 gallons of hot water
• Easy and convenient to use
• Super easy installation
• Heats up quickly and fast
• With a thermostat swing to customize the temperature
• Energy-efficient even though the faucet is far from the tank
• Prepare enough space before installation as it’s not mini

I bought this water heater to make sure that I always have hot water in my boat. Its 11-gallon capacity caught my attention among several other options in the market. It’s a product of the latest technology so it’s capable of bearing 1,500W.

It has a robust construction to withstand harsh marine environments and corrosion. So, I can rely on it in rendering the same performance through time. It simply means unrivaled durability. I can’t help but be astonished by its double-wall heat exchangers and integrated pressure relief valve. Both of these parts guarantee the security of water inside it and the preservation of heat.

Safety operation is also expected from this tank because of its protected ignition. The last thing that I want is to have a piece of equipment that acts up in my boat while sailing. Thankfully, this water heater gives me peace of mind. There’s a safety control to stop the build-up of unsafe temperatures as well.

• Has a large capacity to not run out of hot water
• Has a robust construction for durability
• With parts that keep and preserve hot water
• Safely operates with ignition protected and safety control
• Needs to be installed by two people as this is a large tank

I don’t go for a tankless water heater if I want more pressure and very hot water. The things that I’m looking for are provided by a hardy tank like this one. Since I sail for a couple of days, it serves me well in providing hot water that I use for showers and washing dishes. This is also an RV marine water heater as it’s mostly used by those who permanently live in RVs.

I was able to double up my hot water supply from 6 to 12 gallons. This tank can be powered by propane and 120 volts of electricity. Although it’s big, I’ve noticed that it consumes less propane and it’s quieter too. Due to the adequate supply of hot water, there’s no interruption when taking a shower as long as the power source doesn’t cease to work.

Before mounting this heater, I flushed it first to ensure that the inside is clean. I did some minor adjustments to the plumbing and it didn’t trouble me at all. It doesn’t take much time and effort to complete the installation. After the assembly, give the cold tap water 15 minutes to turn hot.

• A hardy water heater tank
• With a capacity of 12 gallons which means doubling up your hot water supply
• Can be powered by propane or electricity
• Consumes less propane and operates quietly
• Easy installation to produce hot water in 15 minutes
• Not prone to leaks
• Some minor adjustments on plumbing

When I go sailing, I see to it that I dock my boat before sunset. But, I sometimes spend the night on the waters and return home the next day. Hence, this 6-gallon water heater is just right for my needs. It can be operated by 120 volt AC or engine coolant heat exchange.

To have constant availability of hot water, there’s a thermostat that regulates the heating temperature at 140 degrees Fahrenheit. You may also get cold water from it because of its 1/2-inch NPT.

The inner tank is made of aluminum while the exterior is of marine galvanized steel. With these premium materials, I know that this tank will be with me for a long time. Durability of a water heater is important for me so I have the assurance that it can take care of my boat’s water supply.

Set it up by horizontal mounting and hold-down brackets that are already attached to the inner tank. I did it with ease by myself. You will have to thoroughly check the fittings and heat exchanger parts to avoid any issue. Fortunately, it’s uncomplicated as they are all placed in the front of the tank.

• Can be run by electricity or a boat’s engine
• Has a thermostat that regulates water temperature
• Durable as it’s made of premium materials
• Easy mounting or installation
• With valves for safety operations
• Thorough checking of the fittings during installation

Before buying a water heater, there are two main things that you have to consider. Of course, the size of the heater should match your boat’s size so you have enough space for it. The next thing you have to think about is the number of people onboard. Hold your horses as you can’t just buy a 12V marine water heater if you have a lot of people cruising with you! There are other aspects that you have to ponder as well.

Propane or Electric Powered

Most of the water vessels these days have an electrical system. So, getting an electric-powered water heater is not troublesome. You should know that the heater will always be running without limitations if it’s run by electricity.

When it comes to a propane-powered heater, it has a quick recovery rate even when the temperature is low. You’ll also save on running costs. Some think that electric-powered ones tend to last longer. Nevertheless, propane-powered heaters can keep up.

On the brighter side, you’ll find exceptional water heaters that can be powered by both propane and electricity. So, at any time, you can switch to the power source that suits you best.

Water Heater Size

The water heater should be the right size for your boat. It shouldn’t be too big or too small. If you ignore this matter, it may be bulky for your boat or won’t provide the necessary amount of hot water. If you don’t have ample space for it, go for the tankless type as it’s compact.

Everything you put in your boat is exposed to the marine environment. In this matter, you should consider your boating routine and preference. Experts recommend stainless steel that can withstand all kinds of environmental and weather conditions.

A brand is appealing if it becomes popular due to the satisfaction that it gives buyers. So, settle for a company that has a good reputation and you won’t be disappointed with the quality of their products.

Marine Hot Water Heater Troubleshooting

Be concerned about troubleshooting as it’s important to get the heater fixed in case something goes wrong. Research the product to see if you can handle the necessary troubleshooting steps.

A marine water heater heats water that is used for cooking, washing, or shower. It seems like the one that is used at home but the operating system differs. Hoses are made as connectors instead of pipes .

There are two ways to heat a marine water heater. You can let it run by AC power or marine engine heat. This equipment only needs minimal power as any excess can disrupt ignition. It usually comes as a built-in but selections are in various sizes, patterns, and durability.

Companies become competitive these days. Thus, it’s not only the popular ones that excel in making quality products. Aside from the commonly known Superstor marine water heater and Isotemp water heater, Whale, Kuuma, Bosch, Ecosmart, and Suburban are trustworthy brands in terms of creating marine water heaters.

Most marine water heaters are easy to install. You can follow the steps in the instructional manual but in some instances, you may not need it at all.

You can mount it by the brackets and other hardware that come along with it. Then turn it on and you’ll have water in no time.

Rheem and AO Smith are known as makers of quality water heaters. The former also specializes in crafting air conditioning and air cooling systems while the latter only focuses on water heaters. AO Smith has better customer service than Rheem, which is the primary difference between them.

After reading this review, you know the importance and value of the best marine water heater. It’s an investment with a load of benefits. Hot water is a necessity but it can be luxurious when you’re cruising with your boat. It can make a huge difference in your sailing experience due to the immense comfort that it brings.

“I am James Harvey – founder of Boating Basics Online. It is established with the drive to help out first-time boaters, which are those desiring to explore their way through the water. So if you are new to boating, start from here with me. “

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Whale S360EW 3 Gallon 12 Volt Marine Water Heater W/ Mounting Brackets

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Whale S360EW 3 Gallon 12 Volt Marine Water Heater. The S360EW is an electric only 12 V Water Heater brand new to the marine industry. Ideal for outboards the water heater connects to 12 V power supply meaning there is no need for a generator, inverter or shore power.

The compact and electric-only design of the water heater allows for flexible installation in tight spaces like the galley or transom, freeing up valuable onboard space. With rapid heat-up times, it provides hot water in under an hour and boasts efficient heat retention for up to 10 hours. Ideal for deck showers and wet suits, it delivers 3 gallons of hot water at a time. Safety features include integrated temperature and pressure valves, thermal cut-out, and heat indication output. Plus, an integrated anode ensures longer life, while a relay enables easy switching at the helm.

Heating water with 12V requires approximately 40 amperes at 12 volts for a 30-degree Celsius temperature increase, consuming just over 5 ampere-hours. Additionally, some new inverter heat pumps offer premium designs suitable for various indoor installations.

• Side-mounted combination electric/heat exchanger
• Robust manufacturing
• Hold down brackets welded to the inner tank
• Double-wall heat exchangers
• Integrated pressure relief valve
• Temperature and pressure drain tube included
• Sturdy, robust epoxy coated exterior
• Ignition protected

Warning: Product may contain materials cautioned by California Proposition 65

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Marine Water Heaters Ultimate Guide: All You Need to Know for Efficient Heating Onboard

Marine water heaters are an essential appliance for any boat or recreational vehicle, providing hot water for various uses such as washing up, showering, and even cooking. These heaters are designed to be compact and lightweight, taking into consideration the limited space available onboard vessels. With numerous options available in the market, it can be challenging to choose the right marine water heater for your specific needs.

In this ultimate guide on marine water heaters, we will explore the different types of heaters available, their features, and the key factors to consider when making a purchase. By the time you finish reading, you will have a good understanding of marine water heaters and be better equipped to make an informed decision on which model is best suited for your boat or RV.

Types of Marine Water Heaters

Marine water heaters are an essential part of any boating experience, as they provide hot water for various purposes, such as cooking, bathing, and cleaning. There are three primary types of marine water heaters available on the market: electric water heaters, engine-connected heaters, and hydronic heaters. Each type offers different benefits and suits specific needs, depending on the boat's size and power capabilities.

Electric Water Heaters

Electric marine water heaters rely on an electric heating element to heat the water. These units are typically connected to the boat's electrical system, either 120V AC or 12V DC, depending on the model. They provide a reliable source of hot water with minimal maintenance requirements. Some popular electric marine water heaters include the  Whale 6-gallon Premium Water Heater  and the  Kuuma 6G 120V Rear Heat Exchange . Electric water heaters are ideal for boats with a stable electrical supply.

Engine-Connected Heaters

Engine-connected marine water heaters use the heat generated by the boat's engine to heat the water. These heaters often feature a double-walled heat exchanger system that transfers heat from the engine's cooling system to the water tank. A popular example of this type of heater is the  Whale Marine Water Heater - Premium . Engine-connected heaters are a highly efficient option for boat owners who frequently operate their engines, as they make use of the engine's waste heat.

Hydronic Heaters

Hydronic marine water heaters use a closed-loop system that circulates heated water or coolant throughout the boat's interior. These systems often have multiple heating zones, with individual temperature controls for each area of the boat. Popular manufacturers, like  Webasto , offer a range of models to suit different boat sizes and heating requirements. Hydronic heaters tend to be more fuel-efficient than electric heaters, as they use a smaller amount of energy to maintain the desired temperature. They are suitable for boaters who prioritize fuel efficiency and have the necessary space to install the heater and its required components.

Key Features to Consider

The capacity of a marine water heater is an important factor to consider, as it determines the amount of hot water available for use on your boat. Capacities typically range from 6 to 20 gallons, so choosing the right size depends on your boat's requirements and the number of people on board. A smaller capacity may be sufficient for smaller boats or short trips, while larger capacities are more suitable for bigger boats or extended trips.

Power Source

Marine water heaters can be powered by a variety of sources, including electricity, engine heat, and propane. Electric marine water heaters, like the  Kuuma 6G 120V , rely on an immersed heating element to warm up water, while engine-powered heaters connect to the boat's engine to utilize its heat. Propane heaters, on the other hand, use a propane burner to heat the water. Each type of power source has its own advantages and drawbacks, so choose one that best suits your boat's setup and your specific needs.

Materials and Construction

The materials used in the construction of a marine water heater can also impact its long-term durability and performance. Many marine water heaters feature stainless steel or galvanized steel tanks, as these materials are known for their corrosion resistance and longevity. For example, the  Whale F600 Water Heater  has a galvanized steel tank, while the  Kuuma 11G 120V  is made of stainless steel. It's important to select a water heater made from high-quality materials that can withstand harsh marine environments.

Safety Features

As with any appliance, safety is a crucial consideration when choosing a marine water heater. Look for water heaters with built-in safety features, such as overheat protection, pressure relief valves, and ignition protection. These features can help prevent malfunctions and potential accidents while onboard your boat.

Ease of Installation

Lastly, consider how easy it is to install a marine water heater on your boat. Some heaters, like the  Kuuma 6G 120V side mount front exchanger , offer more flexible installation options, making them suitable for tight spaces or corners. Others may have more specific requirements for placement, which can be a challenge in limited spaces. Ensure that the water heater you choose can be easily installed on your boat without requiring significant modifications.

Popular Marine Water Heater Brands

Several well-known brands in the marine industry offer high-quality water heaters suitable for various types of boats. In this section, we will discuss a few popular marine water heater brands to consider for your boating needs.

Kuuma:  Kuuma is a trusted name in marine water heaters, offering reliable products designed for marine applications. Their  6G 120V Side Mount Front Exchanger  and  11G 120V Front Exchanger SS  are popular models known for their durability and performance. Kuuma water heaters come in various sizes and configurations, making it easy to find the right one for your specific needs.

Whale:  Whale is another renowned brand in marine water heaters. They produce durable and efficient heaters suitable for boating enthusiasts. The  Whale F600 Water Heater , with a 6-gallon capacity and front heat exchanger, is one of their popular models. Whale water heaters are also available in various sizes and configurations to meet diverse boating requirements.

Raritan:  Raritan Engineering is known for its high-quality marine water heaters designed to perform in harsh environments. Their  1700 series  is engineered specifically for marine applications and offers reliable performance with dockside recovery rates of up to 18 gallons per hour. The adjustable thermostat in Raritan water heaters enables precise temperature control, making them an excellent choice for boaters.

In conclusion, Kuuma, Whale, and Raritan are some of the popular marine water heater brands to consider when upgrading or installing a new system on your boat. Each brand offers a range of products tailored to suit various needs, ensuring that you can find the right water heater for your specific situation. Keep in mind that researching and comparing different options is vital to making an informed decision and getting the most value for your investment.

Maintenance and Troubleshooting

Regular maintenance.

Proper maintenance is crucial to ensure the longevity and efficiency of marine water heaters. Regularly inspecting the water heater and its components can prevent potential issues and costly repairs. Some essential maintenance tasks include:

• Checking and replacing the water heater anode when necessary. The anode protects the tank from corrosion, and wrapping Teflon tape around the threads of the anode can help prevent leaks during reinstallation ( BoatUS ).
• Examining pipe joints and hose connections for leaks. Using Teflon tape or pipe joint compound can help prevent dripping, and hose clamps ensure tight seals on hose barb-to-hose connections ( Practical Sailor ).
• Ensuring proper and consistent supply of gas and electricity to the water heater. Test for stable gas supply by lighting a stovetop burner, and use a voltage meter to check that input to the heater is at least 10.5 volts ( RV Repair Club ).

Common Issues and Solutions

Marine water heaters may experience various problems, which can often be resolved with some basic troubleshooting:

Consulting the water heater's manual and seeking professional assistance when unsure about diagnosing or resolving an issue is recommended. Regular maintenance and diligent troubleshooting can help extend the life and enhance the performance of marine water heaters.

Environmental Considerations

When selecting a marine water heater, it is essential to consider the environmental factors that will impact its performance and longevity. Marine environments expose water heaters to high-humidity, aggressive water conditions, and other harsh factors that can affect their functionality and reliability.

One major concern in a marine environment is corrosion. It is crucial to choose water heaters that have corrosion-resistant components to ensure long-lasting performance. Many top-quality marine water heaters, such as those offered by  Torrid , include glass-lined inner tank vessels to mitigate the risk of corrosion and reduce bacterial buildup.

Eco-friendly operation is another important environmental consideration. Look for water heaters that meet stringent energy efficiency standards and provide optimal heat transfer without excessive energy consumption. Additionally, these heaters should have minimal noise output to limit noise pollution in the surrounding marine environment.

Furthermore, insulation plays a crucial role in maintaining the water temperature and reducing heat loss. Marine water heaters with good insulation, like the polyurethane foam used in  Sigmar heaters , can still have water heated at more than 80-degrees after 20 hours of shutting off the heating element.

Last but not least, proper installation is key in minimizing potential environmental risks. Ensuring that the water heater has a secure mount on a well-reinforced surface can help prevent potential damage and instability during rough seas, as mentioned by  Practical Sailor .

Considering these environmental factors will help guide boat owners in choosing a suitable marine water heater that is reliable, efficient, and durable in the challenging marine environment.

In this ultimate guide , we have discussed various aspects of marine water heaters, from the top-rated models to the factors that should be considered when making a purchase. The  5 best marine water heaters  we reviewed, such as Whale Premium Water Heaters and Kuuma Water Heaters, showcase the options available to boat owners.

When investing in a marine water heater, factors like size, capacity, heat exchanger type, and power source are crucial in making the right choice. For instance, smaller boats may benefit from a compact design like the  Cobalt Aquatics Neo-Therm , while larger vessels may need heaters with greater capacity.

An efficient marine water heater not only provides comfort but ensures a pleasant and warm experience during long sailing expeditions. Since various models are available on the market, carefully weighing your specific needs and preferences will lead to a suitable purchase that will cater to your boat's heating requirements.

Lastly, proper installation and maintenance of your marine water heater are key to reliability and longevity. Make sure to follow the manufacturer's guidelines and consult professionals when necessary. By taking all these factors into account, you can select and maintain the ideal marine water heater tailored to your unique needs.

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Wholesale Marine is well known for the best quality boat parts at competitive prices. This is why our happy customers return again and again.  If you need assistance in selecting what part you’ll need, simply give us a call and enjoy our courteous and efficient service. We are boat enthusiasts too, and can help you make the right marine water heater selection. Be sure to ask about our Captain’s Club Rewards Program for additional discounts on everything you need to keep your boat in optimal condition for your next adventure! Call us at (877) 388-2628; we’re here Monday through Friday, from 8:30 AM until 4:30 PM, EST.

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When boating or camping, is there any luxury greater than hot running water? Bring the comfort of heated water aboard your boat or RV with boat water heaters and boat water heater equipment from Great Lakes Skipper's huge inventory of new and replacement boat parts. We bring in thousands of boat parts and accessories every month, then offer them to you at closeout prices. Here's your chance to save big on boat water heaters from brands like Attwood. Check back frequently for our newest additions, then order online or give us a call.

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Great opportunity, Pearson 35 Sailboat - $13,000 (Puget Sound)

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This is a great opportunity, I bought this boat the end of May, in Skagit County (LaConner) I intended to sail it from Puget Sound to Lewiston, Idaho. I've done it before in a smaller boat. But this...

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How are Russian homes heated?

Every autumn, Russian social media users spontaneously spring into action and everyone, without prior arrangement, starts exchanging photos of cats lying on radiators. The image is so popular that, for example in Perm and Saratov, they’ve even erected monuments to cats on radiators.

A monument to a radiator in Samara.

In posting such pictures, millions of Russians are trying to summon the heat to their flats. You may wonder why they go to such lengths, instead of simply turning on the heating? Well, in Russia, it’s not that easy! Heating system is handled very differently from what you are probably used to. 

Universal warmth for all

In Russian cities, most buildings are centrally heated by hot water flowing through pipes. The water temperature is the responsibility of a local boiler station or heat-and-power plant - one per neighborhood or district. It supplies heat to cast-iron radiators (or increasingly in newly installed modern aluminum radiators) in flats when the average daily temperature outside stays below eight degrees Celsius for five days in a row. 

As a rule, the heating season in the European part of Russia lasts from October until May, but it often happens that cold weather spells arrive sooner, when the heating has not yet been turned on. For instance, the Urals and Volga region already had snow in September 2019.

And in Moscow, the temperature plummeted to +5 in mid-September, and many residents are still waiting for their radiators in their flats to become warm. Yulia Petushkova lives in the Belyayevo district in the west of the city and she also has to patiently wait. "It's cold at work, it's cold outside and it's cold at home. From one cold place, I have to go to another cold place, through another cold place. They turned on the heating on on September 25, but it is still cold at home, although I can now sleep with two duvets rather than three!" 

"Well, what’s the latest, have they turned on the heating yet?"

But Daria Sokolova from Tsaritsyno in southern Moscow was not so fortunate: In her building, the heating was officially turned on on September 24, but not in all flats. "The water has not reached my flat through the distribution pipe, it is very disappointing, since they did promise to turn the heating on," she laments. 

"Come, I'll show you my room of luxury"

Comrades, open the window!

But that’s just one side of the story. As you know, the temperature in Russia can change suddenly and yesterday's frost may be followed by a sudden warm spell. But your home will remain HOT, because the authorities have already turned on the heating. The water temperature in the radiators is regulated centrally at boiler plants and you can't turn it up or down independently. 

And when they do start supplying heating to Russian homes, they do it wholeheartedly. In major cities, for example, the water temperature is calculated automatically depending on the weather. And at small boiler plants it is done manually. In any case, during the heating season, according to the state norm, the temperature in an apartment should not fall below 18 degrees Celsius and in the bathroom it should be no less than 25 degrees. For living rooms the upper temperature limit is 24 degrees.  

"That feeling when your house is the first in line to have the heating turned on"

Therefore, many people in Russia during winter wear T-shirts at home and leave the windows open. This, of course, has its advantages, because there will always be fresh frosty air in the flat. Nevertheless, there are buildings in Russia with autonomous heating systems, and not just in the private sector. Some new residential complexes have their own boiler-rooms that provide heating much quicker and where the temperature can be adjusted.

How much do Russians pay for heating?

It would be logical to assume that Russians only pay for their heating in winter, but no.

They usually pay an average price for heating over a year on a monthly basis, otherwise winter payments could and would be in the thousands of rubles. Nevertheless, local authorities often decide themselves if residents should pay for the heating only when its on or spread the payments over the calendar year.  For instance, in winter residents of chilly Kamchatka pay 7,000 rubles ($100) a month for heating their flat but in North Ossetia in the south of the country only 3,000 rubles ($40). 

Whose brainchild was this excessive heat??

Hot water radiators were first invented in Russia - moreover, back in the mid-19th century. The invention belongs to industrialist with Prussian roots, Franz San Galli. Radiators manufactured at his factory in St. Petersburg were exported around the world.

Although most houses were heated with wood-burning stoves, by 1917, major Russian cities had buildings that used a hot water heating system. Centralized heating and electricity only came to people's homes in the Soviet period, in 1924, and, when Khrushchev-era apartment blocks started being built en masse in residential districts in the 1960s, people in Russia practically forgot what it felt like to be cold in the winter.

By the way, in the 1980s, Soviet engineers thought about heating houses using atomic energy, but in the wake of the Chernobyl disaster such projects were stopped. Nowadays, Russian boiler plants use gas for fuel.

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Heating in Russia

My buddy, Fred, was over for a visit and the talk turned to steam. Fred works for Consolidated Edison in New York City. Con Ed provides the electricity and steam for a big part of the Big Apple. “A lot of people say that Con Ed has the largest district heating system in the world,” Fred said, “but I hear there’s a bigger one in Russia."

“I’m pretty sure that’s a district hot water system over there,” I said.

“You sure?”

“One way to find out,” I said and walked into my office here at home. I asked the on the Wall 11:33 AM and got an answer from Jim Sokolovic at 11:37. Jim said that he had co-workers in Russia and that he would ask them. What specifically did I want to know? I told him that I wanted to know if it was steam, hot water or a combination of both. He got back to me at 11:55 with this:

“Dan, The heating plant is a single boiler, usually oil-fired, and they keep it in a garage-type structure. It supplies hot water through a continuous circulation system underground. Cast-iron radiators are in the buildings, which the government owns. There are no thermostats in the buildings, but the rooms never get warm enough, anyway. It’s chilly over there!”

Christian Egli then posted a terrific article that had appeared in the Moscow Times on August 7, 2003. Here’s a bit of that:

“It's summer, and your hot water is turned off again.

“But the shutoff that often bewilders foreigners unfamiliar with the peculiarities of Moscow life might not always be an annual tradition: Engineers say a solution is in sight.

“However, it might take 200 years before your neighborhood has hot water all year round.

“Moscow Heating Network, the subsidiary of Mosenergo in charge of the main pipes that ship steamy-hot water from electric power plants to neighborhood heat-exchange points, sees the city's savior in a new pipe that is resistant to rust -- the main culprit that forces it to turn off hot water for repairs every summer.

“The pipes are protected by a special water- and heat-proof coating that is several centimeters thick and filled with rust-fighting polyurethane foam, said Viktor Tarasov, deputy chief engineer at Moscow Heating Network, or Teploseti. The pipes also are equipped with detectors that alert engineers about the need for small repairs before any major damage occurs.

“All this means that the new pipes can remain in service for 25 to 30 years without any major repairs, thus allowing hot water to be kept on all the time, Tarasov said.

“Just about every neighborhood takes its turn without hot water for three weeks every summer as engineers repair a vast and aging pipeline system that stretches for thousands of kilometers under -- and sometimes over -- the ground.

"The problem is that Moscow's heating and hot-water supply systems have a level of technology dating back to somewhere in the 1930s," Tarasov said in a recent interview.

“In most cases, city dwellers get their heating and hot water through a complicated system in which extra-hot water -- heated up to 130 degrees Celsius in the peak of the winter -- is pumped through the main pipes to the neighborhood heat-exchange points. There, through special heat-exchange equipment, household water is warmed up -- but not mixed with -- the water from the power plants and the cooled-off steam is returned to the plants. Some of the longest main pipes stretch 20 kilometers from the power plants to the neighborhood heat-exchange points, or nearly halfway across the city, Tarasov said.

“This relatively unique heating and hot-water system was adopted primarily due to the city's vast size and the area's cold climate, Tarasov said. "And since electricity is produced anyway, the hot steam is effectively a byproduct that is a free source of heat," he said. "It would have been silly to waste it."

So Fred had his answer, but the “Wallies” weren’t through yet. Cliff Heeney added this:

“Dan, I live in Tallinn, Estonia. Estonia was formerly a part of the USSR, so I believe that the heating systems that we have here are probably basically the same system as in Russia today. We have district heating serving probably half the city, which has 435,000 people. As far as I know the boilers are all fired with oil and only make hot water, which is then piped into the district that that particular plant serves. There is a power-generating plant on the outskirts of the city, which of course utilizes steam to fire the generator. I believe that they then use the steam through a heat exchanger to make hot water for the district heating in that particular area of Tallinn.

“Each building has a meter and pays for the amount of hot water that is used. Some of the apartment buildings that have been renovated have also placed individual meters in each apartment so that the bill can be divided evenly. Without the individual meters, then the apartment owners pay a percentage based upon the size in square meters of their apartment.

“The temperature of the hot water produced by the district heating plants is based upon the outside air temperature. So just imagine a giant sized outdoor reset!

“Sorry that I can't answer your question about Russia right now, though. My wife's favorite aunt lives in Moscow; we'll send her an email tomorrow and see what she can find out for you.”

Isn’t the World Wide Web wonderful? While I waited for Cliff to get back to me, other Wallies chatted away about district heating around the world. Two days later we heard again from Cliff

“My wife, Tuuli, called her favorite aunt, Evi, in Moscow today. Evi and her husband, Sergei, believe that almost all, if not all, of the district heating in Moscow is with water. They have heard of a few older buildings, and some of the new ones being heated with steam, but they don't think that is being done with a district heating system. More than likely the individual building has it's own steam boiler dedicated for the use of that building. They weren't able to verify that though.

“They also believe that most, if not all, district heating in Russia would be with water, not steam. They have traveled somewhat and they have only seen hot water being utilized in district heating set-ups.

“We asked them if they knew of anyone who works in that utility and unfortunately they don't. They are going to ask around, though, and try to find someone who either works in one of the district heating plants, or who has a friend who does. I'll let you know what they find out.

“I was born and raised in Vernal, Utah. I have lived in Estonia for about six years and have been married to my wife, who is an Estonian, for 5-1/2 years. We have two children, our daughter, Nancy, who turned two years old today, and David, who is eight months old.“

Small world isn’t it? Later that day, Eric Petersen wrote, “Central heating is a feature of some housing developments in Finland. A friend of mine bought a new house in the Helsinki area and the whole development is heated by a central system which provides hot water. I remember walking to his house from the bus stop and seeing where they were laying the heating-distribution pipes deep in the ground for a different set of houses. The control mechanism was TRVs but I don't know how they charged for usage. I do know that these types of houses are very well made, insulated, and comfortable all through the winter. Actually winters near Helsinki are not that much colder than Chicago. One other thing, my friend views American housing developments (especially apartment complexes with hot air heating) as somewhat barbaric in that it seems wasteful for everyone have to have a separate heating appliance in their unit. Wasteful and noisy (hot air that is)."

A few hours later, Cliff Heeney was back to say. “Just got off the telephone with our Finnish friends who live in Vantaa, a suburb of Helsinki. Their apartment building is heated by district heating, as most are in Helsinki. They are not charged by how much hot heating water that they use, but rather a flat rate based upon the square meters of their flat. It is built into their monthly maintenance fee. Each apartment or flat is owned by an individual and they all pay a monthly maintenance fee, I think it’s similar to what a condo owner would pay in the USA. No steam is used in their systems."

So, if you looking to learn about heating, or just about life in general, stop by The Wall and ask a question. It's amazing who hangs out there. 

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