RV manufacturers are pretty good at replicating the features of sticks-and-bricks houses in our homes on wheels. Everything from kitchen appliances to air conditioners have been incorporated into today’s RVs. It’s safe to say that the RV water heater has become a necessity.

As RVs evolve, the water heater is one appliance that most campers have discovered they can’t live without. It gives us all the creature comforts of home as we travel across the country in our RVs. While there are obvious differences between a house water heater and an RV water heater, they aren’t too complicated, and most of them do have several things in common.

Let’s discuss everything you need to know about your RV water heater.

Types of Water Heaters

There are four distinct types of water heaters available on the RV market today. Each RV water heater has its own specific benefits and a few detriments. It’s important to look at your camping style and hot water needs before deciding on the type that’s right for you (or to help you understand the pros/cons of the model that came in your RV).

Gas RV Water Heater ()

Most gas water heaters run on propane and hold between 6 and 12 gallons of water. Propane is an economical way of heating water, making a gas water heater beneficial for camping off grid.

Electric RV Water Heater ()

An electric RV water heater is dependent upon 120V shore power (or a generator) because it uses a great deal of electricity to heat the water. If you like to boondock, you may want to stay away from an electric water heater.

Gas / Electric Hybrid Water Heater ( / )

You’ll typically find these 2-way water heaters in larger RVs like 5th wheels and Class A motorhomes. You can use the propane gas and electricity simultaneously to speed up the heating of the water, but keep in mind that in order to utilize the electric side, you’ll need shore power or a generator.

Tankless RV Water Heater ()

These heaters offer a steady stream of hot water on demand. Once started, they can produce hot water for quite a while (depending on the amount of fresh water available, of course). Because they’re not ‘storing’ water, but instead, move cold water past a heating element, they provide continuous hot water. With no storage tank, they also take up less room in the RV. Most models of tankless RV water heaters that are available today are heated only by propane, but because they only fire up when hot water is needed, they tend to use less propane than a standard gas or gas/electric model with a tank.

RV Water Heater Features

Tank Size ()

Most standard RV water heaters hold 6 to 12 gallons of hot water, which can mean that you may need to restrict the amount of hot water you use, so you avoid having your spouse/partner getting a cold shower! On the other hand, tankless water heaters can provide a continuous stream of hot water as long as your freshwater and propane supplies last! So if you’re fully hooked up, you can shower all day!

Heating Capacity / BTU ()

An abbreviation for “British Thermal Unit,” BTUs measure the amount of heat needed to raise one pound of water one degree Fahrenheit. So the higher the number of BTUs on a water heater, the more heating power it has. Most conventional water heaters have 8,000 to 12,000 BTUs, while tankless hot water heaters offer 30,000 to 50,000 BTUs. That greater rating is needed in order to heat the water fast enough as it flows through the heater.

Water Flow Rate ()

This is the amount of hot water a heater releases per minute. Because many tanks only hold 6 gallons of hot water, RVers have learned how to slow that water rate down, either by using a shower head with an on/off button or by manually turning off the water periodically. The same holds true for washing dishes in the kitchen sink. Tankless hot water heaters can usually produce at least 2 gallons of hot water per minute… which is more than enough for most RVers needs!

Top RV Water Heater Manufacturers

Most RV water heaters are made by one of the following manufacturers:

  • Atwood: Now a part of the Dometic family, Atwood has been making water heaters and furnaces for recreational vehicles and mobile homes since 1964.
  • Suburban: Owned by Airxcel, Suburban has been a top manufacturer of RV water heaters, furnaces, ranges and induction cooktops for more than 70 years.
  • Truma: The leading European RV component supplier, Truma is rapidly gaining traction in the North American market with their tankless water heaters and combination furnace/water heaters.
  • Girard: One of the earliest entrants to offer tankless water heaters to the RV market, Girard has continued to advance their product.

RV Water Heater Maintenance

While they’re not a particularly complicated appliance, hot water heaters DO require a bit of maintenance to keep them in tip-top shape. But when weighing the benefits of having hot water available on-demand while you’re camping, these maintenance chores are a small price to pay:

Cleaning and Descaling an RV Water Heater

Sediments will build up in your RV water heater over time (especially if you RV in areas with hard water), so annual flushing of the appliance should be included as necessary maintenance. To do this, here’s a general overview of the process. You’ll start by turning off the water, gas, and electrical supply to the water heater. Then, you’ll want to wait several hours (or even overnight) for the hot water tank to cool. We recommend turning the gas/electric heating sources off the night before you want to clean the tank out, so the water has had a chance to cool. No matter what method you choose, be very careful to not open your RV water heater with hot water in it! You could seriously injure yourself and we wouldn’t want that.

Next, open your pressure relief valve and remove the drain plug or anode rod to drain the tank. Use an RV water heater flush wand on the end of a garden hose to insert and wash out the inside of the tank. Then fill the tank half full with white vinegar, and fill the rest of the way with water, for a 50/50 vinegar/water mix, and let it sit overnight to dissolve any large sediment pieces. The next day you can thoroughly rinse the vinegar out of the tank and put the drain plug or anode rod back in place. This should give your water heater renewed purpose for at least another year!

If you’re more of a visual learner, you can watch our tutorials on cleaning your water heater here:

Atwood Water Heater

Suburban Water Heater

The RV Water Heater Anode Rod

On Suburban water heaters, which have steel tanks, this metal rod is located in the tank. Anode rods are made of either aluminum or magnesium. The rod attracts ions that would otherwise corrode the tank, allowing those ions to corrode the sacrificial rod instead. And for that reason, it needs to be replaced at least once every couple of years, depending on how much it’s decayed (which will depend on how much you’ve used your RV… and the composition of the water). Hot water heaters made by Atwood don’t have anode rods, as they have aluminum tanks.

Winterizing

If you store your RV during cold winter months, in addition to winterizing your RV’s plumbing, you’ll need to drain the water heater. This ensures that water in the heater doesn’t freeze and damage the tank. You don’t need to get ALL of the water out of the tank, just pull the drain plug or anode rod and let the tank finish draining. The small amount of water that’s left won’t cause damage, as there’s plenty of room in the tank for it to expand as it freezes.

Conclusion

Hot water is a luxury that most RVers have come to love. If you want all of the benefits of having it available at your campsite, whether it be at a fashionable RV resort or off the beaten path in a mountain forest, take a moment to educate yourself on the types of RV water heaters available and the various benefits of each. Then you’ll be able to find the perfect motorhome or travel trailer that affords you a relaxing hot shower whenever you want it!

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