RV Tankless Water Heater

Best RV Tankless Water Heater Reviews

When you have an RV, you know that hot water on demand without needing a tank is going to make your trip a lot easier. A tankless water heater keeps you cozy and warm while you’re on the road, which is why selecting the right model is essential.

Why is a tankless water heater a solution for your RV?

No matter how spacious your RV is, you’re always going to want to have more storage space. The tankless water heaters eliminate the storage problem since they don’t need a tank. They give  hot water on demand without you having to wait for the water inside the tank to heat up.

Let’s see the main benefits of a tankless water heater:

  • You don’t wait for hot water

It’s one of the most significant benefits of tankless heating systems. You never run out of hot water supply also because they have a high recovery rate.

  • They cut down the spendings

It may take an hour for a traditional heating system to heat the water in a tank, but that’s not going to be the case with the tankless systems. When you’re not using electricity for heating the water for an hour, it makes sense that you also cut down your spendings.

  • They’re easy to install and to use

Many tankless water heaters feature digital screen, so that you may adjust the temperature according to your needs at the moment. For most models for RVs, the installation is also a breeze.

  • They need small space for storage

Not only that you no longer hours for hot water, but the unit is also smaller, saving you storage space in your RV. The portability is also better, so you can carry the water heater wherever you need it. There is no tank either, which means even more storage space to use for anything else.

  • They’re green

Since the tankless water heaters don’t keep the water inside the tank, they do present as a greener option than the traditional heating systems. Even if the gas models pose some problems, the electric tankless water heaters are also environmental friendly more than all the other heating systems.

How many types of tankless water heater can you choose from?

The variety of the tankless water heaters is impressive, but there are only two main to select for your RV:

  • Gas type- You need kerosene, propane, or LP for a gas tankless water heater. They’re more affordable than the electric models, but their efficiency is only around 85%. The costs for gas are low, but they require venting. Give a good thought before going gas.
  • Electric-type- If you want more efficiency, the electric models are the best choice. Most models are around 99% energy efficient and are straightforward to install.

What to remember when selecting your tankless water heater for the RV?

With the variety of models being intimidating for many RV owners, some buying tips wouldn’t hurt:

  • Water capacity- The most common size for RVs is the 6-gallon, and you should always get a tankless water heater that fits your needs.
  • Life span- Look for the high-quality materials and the sturdy build, so that the system lasts for at least a year.
  • Heat output- A high rate of BTU (British Thermal Units) means a high-efficiency unit. It means that the water heater is going to heat the water faster
  • Accessories- Some water heaters may require specific adapters, showerhead, fittings, hoses, and more. Don’t forget to get everything you need.
  • Water output-The GPM (gallon per minute capacity) is fundamental for the power of the unit.
  • Warranty- Any right unit is going to be backed by a guarantee, so make sure you buy one with a warranty.

Top 5 electric tankless water heaters for RV

   1. Electric Tankless Hot Water Heater 110V-3000W

When you want to add color to your RV and have hot water on demand, the Electric Tankless Hot Water Heater, 110V 3000W Mini Tankless is a reliable option.

Small, yet durable for its size, the unit is elementary to install under the sink in your RV. It gives hot water so that you may wash your face, clothes, food, or dishes. You can even use it for a quick shower.

The small size of the unit has nothing to do with its construction. By the contrary, the water heater is a great surprise when it comes to safety features. It has a build protected against leakage but also presents hydroelectric and anti-dry protection. The unit has a waterproof grade of IPX4, and it’s anti-splash protected. The insulation protection of the housing makes thew water heater safe to use for a reasonable amount of time.

To help you understand the importance of safety features, here’s a possible situation. Should the unit detect any leakage, it’s going to de-energize automatically. It can also power off on its own when it doesn’t detect any water. The risk for burning is also null since the unit comes with an over-temperature automatic power-off.

Thanks to its typical 1/2interface, mounting the unit is going to be a breeze to traditional hose connector/faucet metal hose/shower hose. Operating the water heater is also easy, thanks to the LCD digital temperature display. Finding the right temperature for the water shouldn’t pose any problems.

As for the bright colors, we’re slightly torn. Some will fancy fun colors, and some will not. It’s a matter of personal taste.

Let’s check the positive aspects once more:

  • It’s easy to install and to use
  • It comes with many safety features
  • It runs fast, and it’s not loud
  • It comes with pretty colors

The downsides shouldn’t throw you off:

  • If you’re looking for a subtle water heater, this one isn’t the right choice on the cause of the bright colors
  • Check to see if it’s not too small for your RV

Dependable, easy to use, and cute looking, the water heater is always a wise choice for an RV.

   2. Mini Instant Water Heater Electric Under Sink

If you’re looking for an under the sink tankless water heater for your RV, the Mini Instant Water Heater Electric Under Sink should be on your shopping list.

As long as you have a 30amp breakers and a ten-gauge wire, the unit is going to be an excellent addition to your RV equipment. Keep in mind to only run the water heater on 110V, 120V top.

It’s not necessary to preheat the water when using the unit since the unit can heat the water at the needed temperature. Its build and design are great for cutting down your energy spending (down to 55%).

Also, be aware that the temperature isn’t going to get hot when the flow is high and vice-versa. Nevertheless, you can always control the outlet temperature by adjusting the flow.

The compact profile and the small size recommend the unit for mount in the kitchen, bathroom, and anywhere you need in your RV. It’s not a good option for showering, but it can help you wash dishes, face, and hand.

The build gives it a durability feeling, with the unit having an IPX4 waterproof grade and a body made of ABS and brass. You can set the temperature anywhere from 86 to 131 F degrees.

Installation is a breeze, and so it is the operation.

Here’s the list of positive aspects:

  • It has a sturdy build and a compact profile
  • It’s easy to install and to use
  • It’s dependable for an RV
  • You may control the temperature within a suitable range

The downsides are essential to check as well:

  • It’s a reliable option for warm climates and weather
  • It cannot handle a high volume of water

Stay focused on the goods and give the unit a chance next time you’re buying for your RV.

   3. Electric Tankless Water Heater-Ecosmart POU 6 Point

Many RV owners are going to find the Ecosmart POU 6 Point of Use Electric Tankless Water Heater the right choice for their needs. The heater is a point-of-use model, and it’s designed for under the sink mount. It can serve in many applications, presenting a maximum flow rate of 1 gallon per minute, and featuring a 0.5 GPM sink aerator.



The inlet temperature is 72F degrees, and the water heater may heat the water to 105F degrees. It can heat water that is as low as 42F degrees.

The compact size ensures effortless installation under the sink, wet bars, strip malls, bathroom sinks, and RVs. As long as it’s the size you need, it can produce hot water endlessly. You need 100amp electrical panel for installing it with 40amp single pole breaker connected to no.10 AWG wire.

Even if it’s not difficult to install it, it’s wiser that you get professional assistance so that you don’t void the warranty.

Here’s our list of pros:

  • It’s great to use in RV and cold climates
  • It works fast and heats the water endlessly
  • It can heat water as low as 42F degrees
  • It’s excellent value for the price

The minor flaws shouldn’t make you change your mind:

  • Some think that it runs slowly
  • It has a short pigtail

Regardless of the small problems, the unit is dependable, versatile, and looks good in any RV.

   4. New RV Atwood 6 Gallon Gas-Electric Water Heater

For the RV owners that are into the DIY projects, the New RV Atwood 6 Gallon Gas/Electric Gc6aa-10e Water Heater sounds like a great project to try their skills.

The unit is a gas/electric option that combines both gas and electric. You don’t need to worry about the aluminum anode for corrosion, and more than 95% of the elements are easy to replace/service through the outside door.

The service is simple, and you can very well do it on your own. The unit has a smart design and features a high-temperature limit switch and temperature control for more customization. The pressure relief function is going to protect the equipment, ensuring safe use every time.

The unit comes with 6-gallon capacity and has direct spark ignition input. You need 120V for running the water heater. It has a switch as well.

Let’s check the functional aspects once more:

  • It’s a gas and electric unit
  • It’s easy to install and to service
  • It features an outside door for accessing the elements inside
  • You can control the temperature and use it safely

The downsides shouldn’t stress you, though:

  • You may have to wait ten minutes for a shower
  • It’s a tight space to work in

As long as you’re willing to compromise, the unit should work when you’re not sure which type of water heater to get for your RV.

   5. Bosch Electric Tankless Water Heater

Compact and lightweight, the Bosch Electric Tankless Water Heater is always a good buy for an RV owner. It gives 3.2kW output and provides hot water at point-of-use faster than you think.

Due to its shape and size, the unit is easy to install under the kitchen or bathroom sink. It allows both vertical and horizontal mount, which only makes it more versatile.

The 98% energy efficiency with minor stand-by loss is impressive, and the water heater ensures an endless supply of hot water to the bathroom, kitchen, and handwashing. For getting best out of it, it’s wiser that you call for professional installation and hardwiring. It can operate on 110-volt at 84% of capacity and on XX-volt at 75% of capacity. The activation flow rate is 0.5GPM.

Not only that the water heater is small and compact, but it’s also lightweight. Its profile is appealing, considering it’s a tankless water heater. It runs quietly and takes the use in an RV.

We sure like a lot some of its features:

  • It allows both horizontal and vertical mount
  • It’s small, compact, and nice-looking
  • It’s lightweight and runs quietly
  • It’s reliable and works in RVs

Don’t make a fuss out of the minor problems:

  • Some find the reset button difficult to press
  • It doesn’t have a thermostat

If reliability, versatility for the mount, and consistent performance are enough for you on an electric tankless water heater, this model is money well spent on any given day.

Top 5 gas tankless water heater for RV

   1. Camplux 5L 1.32 GPM Portable

Don’t let the affordable price of Camplux 5L 1.32 GPM Portable fool you since the water heater is an excellent choice for an RV or outdoor applications.

It’s a CSA approved portable tankless water heater that only needs 3.0PSI for starting. You can also pair it with the Camplux 12V 1.2GPM water pump. The operating propane gas pressure is 0.4PSI, while the highest power output is 28,000 BTU/hour.

The water heater is going to give you water as hot as 114.8F degrees, while the minimum temp for water can be as low as 46.4F degrees, with 1.32GPM power.

The construction is well thought out, and the water heater includes several safety features. It comes with anti-freezing protection, oxygen depletion safety, and shut-off protection. It also comes with overheat protection, and it’s a flame failure device.

You may install it also indoor, as long as the ventilation is efficient. Installing and operating the water heater isn’t difficult.

Two D cell batteries run the ignition, so you don’t need electricity for running the water heater. The compact size allows secure mount, saving you space in the RV. The unit also features a folding handle for more portability and effortless set-up outdoors.

Keep in mind that you cannot use the water heater for drinking water nor in elevation above 2,000ft.

Let’s give the positive aspects a second look:

  • It works with water pressure as low as 3.0PSI
  • It presents several safety features
  • Installing and operating it is easy
  • It’s compact and comes with a foldable handle for portability

The negative aspects don’t worry us:

  • The shower attachment isn’t amazing
  • The connectors aren’t 100% US standard, according to some

   2. Marey Propane Gas Tankless Water Heater

Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heaterticks most boxes in terms of performance, build, and features within the category.

The water heater produces endless hot water no matter when you need it, for as long as you need. Besides, it can also reduce your electricity bills down to 60%.

You can use it with both propane and natural gas, with the water heater producing up to 2.7GPM for a hot shower of 115F degrees output water temperature. It’s big enough and powerful to handles two or three points of use at the same time.

The compact profile is going to save space, whereas the installation doesn’t pose many challenges. Anyone likes the DIY projects, is going to find mount and installation fun to do. Once installed, the unit is easy to operate, allowing control for the water temperature.

The water heater uses a 2-D cell battery for ignition and venting. Be aware that the vent pipes aren’t included.

It’s a water pressure activated unit, which can work from 50ft distance to the point of use. It doesn’t need an electrical connection, and it’s a dependable option for anyone always dealing with power outages. It makes sense that it’s a great model to install in your RV too.

We’ve shortened the pros to the following:

  • It works with both propane or natural gas
  • It allows DIY installation
  • It has a compact design and saves space
  • It’s good for multiple points of use

The inherent problems aren’t deal breakers for us:

  • It doesn’t come with vent pipes
  • The temperature may fluctuate at times

Dependable, easy to install, versatile, and allowing multiple points of use, the water heater can work in an RV on any given day.

   3. Eccotemp Portable Tankless Water Heater

There are many things to appreciate about the Eccotemp L10 2.6 GPM Portable Tankless Water Heater, and long of features seals the deals for many.

It’s a gas tankless water heater that is made with high-quality materials and uses liquid propane. It includes a CSA regulator for using the standard 20lb. Grill propane tank. The heater is a great option to use for outdoor showers, camping, RVs, and even washing your furry pets.

The operating range is 20-80psi, and the unit features a 20-min Safety Shut-off timer for safer use. It also comes with a 45-degree safety tilt-switch, so you worry less when using the heater.

The water heater comes with ½” NPT for garden hose adapter, gas regulator and hose, showerhead, output water fast connects, and garden hose adapter. It’s a versatile model to remember when shopping.

Since it’s able to reach temperatures between 50 to 140F degrees, the unit is a valid model for cabins, camping, or around the house. It presents electronic ignition which is powered by 2 D cell batteries. It works with 12V pumps as well.

The water heater comes with manual water temperature controls, and it’s field-tested to 5,500 ft elevation. You can use it with any showerhead or hose, and it’s pressure activated.

Compact, lightweight, and effortless to carry around, the gas tankless water heater is a sure buy. It comes with manual easy to follow.

Let’s check the positive aspects once again:

  • It’s highly versatile and field-tested
  • It’s pressure activated and has battery-powered ignition
  • It has safety features and reliable performance
  • It’s compact, lightweight, and portable

The downsides shouldn’t make you change your mind:

  • The customer service may not be safe for help when in need
  • The connections are somewhat challenging to make

With the functional aspects outweighing the negatives, one can only give the unit a try, especially if they go for the outdoor adventures and RV camping!

   4. Girard On-Demand Tankless Water Heater

The more you’re willing to pay for your gas tankless water heater, the more you can expect in terms of performance and durability. The Girard 2GWHAM On-Demand Tankless Water Heater is a dependable model to install in your RV. You don’t need any LP gas lines or particular plumbing for mounting.


The unit comes with freeze protection, and it’s made to handle the winter use. The 42,000BTUs are great for ensuing best performance for the RV’s plumbing. The motor is a brushless model that runs quietly. The 12V power operates at less than 3amp.

The water heater is going to heat water on demand, and it’s easy to operate. You only turn on the hot water and choose the temperature you need. The on-board microprocessor is going to check the incoming cold water temperature, the flow rate, and the outgoing, warm water temperature. This way, the hot water flow is going to have a steady and constant flow.

The days when you couldn’t have a long hot shower in your RV are all gone with the unit ensuring continuous and constant temperature for hot water. Should you ever experience troubleshooting, the customer service is going to be more than happy to help you.

We sure like some aspects more than others:

  • The unit doesn’t require LP gas lines nor exceptional plumbing
  • It features a brushless and quiet motor
  • It ensures constant temperature for the hot water
  • It’s great for RV’s

Don’t let the minor flaws stress you in any way:

  • If you’re installing it on your own, you may void the warranty
  • It needs at least 1GPM water flow for an excellent performance

The gas tankless water heater is a robust model for your RV, especially you also fancy the winter adventures.

   5. PrecisionTemp RV-550 Tankless Water Heater

Frankly, the price of PrecisionTemp RV-550 Tankless Water Heater may scare some people off, but the unit may be the best addition for your RV equipment.

Specially designed for RVs, small houses, trailers, mobile washing services, cabins, and more, the water heater weighs 1/3 as much as a 10-gallon tank and only needs half the space. It doesn’t feature pilot light, but it presents high propane efficiency. It features dependable VariFlame technology control system, and it preserves both water and energy.

The water heater operated when you tap the hot water on. Since it’s tankless, it uses up to 50% less propane. It features accurate automatic gas modulation, so it self-adjusts the amount of gas according to the variations in water flow and incoming water temperatures. You obtain consistent temperature control without worrying about overheating the water in warm months or not heating enough in the cold season.

The unit only needs 1.5amps of power in normal operating and 3amps when its cold weather protection is turned on.

For continuous operation, the 12V and gas supply needs to remain on so that the burner keeps firing and the electric elements to protect the system against the freezing temperatures. Should you only use the RV in the warm season, you need to winterize the water heater.

The water heater gives an impressive 55,000BTUs output, and the temperature of the water remains constant, no matter the flow rate or the temp of incoming water.

Every single unit is designed, put together, and even hand-tested in the USA.

Here’s the list of favs:

  • It’s powerful and dependable
  • It’s small considering its power
  • It works both in the summer and winter
  • Its performance is reliable, and the build is impressive

The cons aren’t significant at all:

  • It’s not a cheap unit
  • You may have to make some adjustments to the RV

Even if the water heater isn’t all roses and rainbows, it’s still a significant investment to prepare for your RV for the long run.

FAQs on tankless water heaters for RVs

Q: Are the RV tankless water heaters easy to install under the sink?

A: If you want instant water and to reduce your spending, buy a model that allows under the sink installation. Go over the manufacturer’s specific manual for the information on best place for installing the water heater.

Q: Is it challenging to install a water heater in an RV?

A: Due to a variety of models, it makes sense that the installation process differs from one model to another. There’s no such thing as one size fits all in terms of mounting. However, most RV models don’t require a plumber of any professional help.

Q: Is it possible to turn an RV water heater into a tankless type?

A: You may have an upgrade and turn the traditional RV water heater into a tankless model. You may have to remove the old installation with a new one. It’s not an easy process, and you should look into it.

Q: Do you have to clean the RV water heater?

A: As a matter of fact, yes. You need to do it regularly for preventing the buildup of bacteria, especially if you didn’t use it in a long time. Always check with the manual of your tankless water heater about the cleaning instruction.

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