6 of the Best Tankless Water Heater For RV, Camper or Travel Trailer [2023 buying Guide]

You have just had a great day out and now need to take a shower – quick. Are you ready to wait for a whole hour to get the hot water tank ready? You may even have to wait a little longer if you are several, sharing one bathroom and you happen to be the last in the line. Eventually, you may even find that the hot water reservoir has run out by the time it gets to your turn. You must be thinking how nice it would be if you had installed a best tankless water heater for RV (Recreational Vehicle), camper or travel trailer.

Quick navigation guide;

Tankless water heater for RV, camper or travel trailer comparison guide

How does a tankless water heater work?

Benefits of choosing the best tankless water heater 

The Tankless Water Heater for RV, camper, or travel trailer buying guide -what to consider before purchasin

Tankless water heater for RV, camper or travel trailer reviewed 

  2. Rinnai RUC98iN Ultra Series
  4. Takagi T-KJr2-IN-NG Indoor Tankless Water Heater
  5. EcoSmart ECO 11 
  6. Eccotemp i12-LP

Tips and precautions when using the  RV tankless water heater

Final thoughts on the tankless water heater for RV, camper or travel trailer

The  tankless water heaters for RV, camper or travel trailer comparison

Tankless water heater brandpowerMore info
NEW RV ATWOOD GC6AA-10E gas/electric
Rinnai RUC98iN Ultra Series natural gas
Excel LPG Propane
Takagi T-KJr2-IN-NG Indoor natural gas
EcoSmart ECO 11electric
Eccotemp i12-LP liquid propane

How does an RV, camper or travel trailer tankless water heater for  work?

A tankless water heater is an obvious choice when it comes to heating water in recreational vehicles, campers or travel trailers. As the name implies, it has no tank.

To enjoy a constant flow of hot water, you open the water faucet, the burner senses the water flow and starts the heating process. So what benefits accrue from this type of heating?

 The benefits of choosing a tankless water heater for  camper, RV, or travel trailer

  1. You are assured of a limitless source of hot water. Well, you only need to turn on the water faucet and as soon as the water starts flowing, it is immediately heated.
  2. No waiting for water to heat up as you get the hot water on demand.
  3. You do not have to refill the tank
  4. Saving on the energy bill as you only warm the water needed. You may save up to 50% off the propane consumption.
  5. The heating unit has a lower risk of spilling
  6. Space saver…The tankless water heater is also smaller and thus takes less space than a standard hot water tank heater which is a great plus given that you have limited RV, camper or travel trailer available space.

How to choose the RV, camper or travel trailer  Tankless Water Heater

Source of power

You may power your RV tankless water heater via electricity, propane, natural gas or battery cell.

Which one suits you best? Note that the battery and propane units are a good choice for the RVs since they are more portable unlike the electric.

The propane powered tankless water heaters  for  camper also provide more water temperature increase than the electric units. Additionally, the electric units are more costly to run per unit.

On the other hand, the RV electric tankless water heaters are also faster to install. The electric powered units have lower maintenance and are quieter than the propane powered units.

Water consumption

Before you commence shopping for a travel trailer tankless water heater, it is advisable to have an estimate of how much hot water you consume per minute. This will roughly give you a clear idea about the actual size of water heating unit you need.

In most cases, the average water consumption in gallon per minute (GPM) may range as follows;

  • Kitchen and bathroom sink 2.2 GPM
  • Dishwasher 1.3 GPM
  • Clothes washing machine 3.3 GPM
  • Shower and bathtub 2.5 GPM

Will you be using the above facilities /appliances at the same time or at different times? Add up the GPMs of the various facilities and choose the most  preferred RV tankless water heater that matches your demand.

The smaller the heater, the slower the water flow rate and may only handle one faucet.

The hot water temperature you want

Know your incoming water temperature and the hot water temperature desired at each of the outlets. The outlets could be the sink, shower, bath tub, washing machine etc.

To determine the rise needed subtract the hot water temperature desired from the incoming water temperature (source).

Once the rise desired is determined, ensure that the tankless water heater for RV, camper, or travel trailer is best capable of meeting the demand.

Some heaters may not heat very cold water. Also note that some heaters can thermostatically control the hot water temperature in which case the thermostat varies the output temperature based on the inlet water flow and corresponding temperature.

The RV Heater BTU Capacity

Note that The British Thermal Unit (BTU) refers to the heating capacity of the unit. While choosing the right BTU capacity, consider the ground water temperatures of the different locations you intend to visit.

Then choose the  tankless water heating unit  for your RV that is capable of heating the cold groundwater in the various locations.



How much space is available for installation of the water heater? Ensure that the water heater size will be accommodated in the available space

Electrical/ gas / water systems and fittings

What specifications do you have in the RV, camper or travel trailer versus the requirements of the preferred tankless water heater?


Which fittings are required? Are they part of the manufacturer’s package?  Which ones do you need to buy?

Where will you place the tankless water heater?

It is recommended you first check the size of the opening you have on your RV, camper or travel trailer. Would the opening in the sidewall require adjusting so as to accommodate your choice of tankless water heater or will it snugly fit in?


You will be using your RV, camper or travel trailer in varied climatic conditions and terrains. How is the water heater protected against poor weather and rough terrain?

Is the heating unit protected against power outages as well as electronic ignition triggered by excessive heat?


Choose the best tankless water heater with an Energy Star certification as it may be more efficient. According to ENERGY STAR® estimates, a typical family can enjoy a saving of  $100 or more per year  when they choose  an ENERGY STAR qualified tankless water heater( source).

Also consider models that have an intermittent ignition device (IID) instead of a standing pilot light. However, should you fall in love with a heater that have the standing pilot, you can still save energy by switching it off when the water heating unit is not in use.

Additional features

Temperature adjustment

Be on the look-out for water temperature adjustment features. The feature could be   a simple knob or automated flow controls.


It is also necessary to review the safety and warranty features.


Does the best tankless water heater for RV, camper or trailer have a glass lining in the tank to minimize corrosion?

Are the drain valves located close to the base of the heater made or brass or plastic? Brass is more durable than plastic.

What is the  heat exchanger made of? Copper heat exchangers are more durable, thermal efficient, corrosion resistant etc.

Simple and easy to understand operation

Does the heater come with a  the digital display where you can conveniently operate, customize and  monitor the  heater operations  as well as the collector and tank temperatures, pressure readings etc.


A manufacturer who believes in the product quality will offer longer warranty. You are better off choosing the tankless water heating unit for RV, camper or travel trailer that has a longer warranty


The lighter the RV tankless water heater, the easier it is to handle.


How easy is the maintenance?


Consider the respective camper tankless water heater cost plus the installation against the budget. While at it, make sure that the unit you choose meets your major needs.

It is good to note that the longer lasting high quality travel trailer tankless water heating unit will certainly cost more.

Make your choice from these tankless water heaters for RV, camper or travel trailer reviewed below;


GAS/ELECTRIC combo  tankless water heater for RV, camper or travel trailer

Best tankless water heater for RV, camper or travel trailer...NEW RV ATWOOD 6 GALLON GC6AA- 10E

Size and weight

This unit weighs 19 pounds when empty and measures 16″ wide, 12.5″ high and 16 7/8″ deep.

Power source

LP gas and Electric


You can easily mount the unit on the side wall. And, you can set it to gas, electric, or both for faster water heating. The package also  comes with a white powder-coated door and switch.


This quiet and efficient water heater has a 6-Gallon Capacity direct Spark Ignition with an  8,800 BTU Input or 1400 watt . The Recovery Rate is 11.6 Gal/Hr on LP / 6.2 Gal/Hr on Electric / 17.8 Gal/Hr on Combo.


To protect this best RV tankless water heater and improve safety the unit has an inbuilt high temperature limit switch, temperature control and pressure relief.


This gas electric combo travel trailer tankless water heater has aluminum clad tanks which eliminates the need to have the aluminum anode to protect from corrosion.


The servicing of NEW RV ATWOOD 6 GALLON GC6AA- 10E is made simple as 95% of the parts can be replaced or serviced through the exterior door. No need for those servicing the unit to enter your RV, camper or travel trailer.


The NEW RV ATWOOD 6 GALLON GC6AA- 10E comes with a 2 year manufacturer warranty.


  • Works perfectly and efficiently
  • You may use gas or electricity or both for faster heating
  • Durable
  • Easy  access when servicing


  • Some users propose that the installation instructions need more clarity

Would you like to know if this tankless water heater fits within your budget?

>>>>>>>>>>>Click here to read user reviews and check today’s price on Amazon<<<<<<<<<<<<<<

2. Rinnai RUC98iN Ultra Series:

Multiple facilities RV, camper or travel trailer  Tankless Water Heater

Best tankless water heater for RV, camper or travel trailer...Rinnai RUC98iN Ultra Series


This best tankless water heater for RV weighs 61.7 pounds Width: 18.5″ Height: 26″ Depth: 10″ Weight: 61.7 lbs Gas


95% Thermal Efficiency Natural gas or propane


You install Rinnai RUC98iN Indoors. The water connection is 3/4″.  Use a softener where you have hard water


You get to enjoy hot water ranging 98° F to 140° F for residential installations such as the RV. For commercial purposes, the temperature ranges 98° F to 185° F. For the commercial installations, remember to purchase the commercial Controller separately.

Energy efficiency

The condensing technology and Electronic Ignition that comes with Rinnai RUC98iN tankless enables the water heater to be more efficient.

BTU Capacity

This best RV tankless water heater has a BTU input between 15,200BTUs to 199,000BTUs


Rinnai RUC98iN meets the California and Texas NOx Emissions Standards.


The limited warranty on this RV tankless water heating unit is 12 Years on the heat exchanger, 5 years on parts and 1 year on labor for residential installations. Please note that you have the option to extend the labor warranty to 5 years.


  • UNLIMITED hot water supply to multiple facilities shower, bathtub etc.) even when running at the same time.
  • Efficient condensing technology
  • Quiet operator


  • High budget unit

Would you like to know if this tankless water heater fits within your budget?

>>>Click here to read user reviews and check today’s price on Amazon<<<<<

3. Excel Water heater:

Best low  pressure (PSI) start RV tankless water heaterBest tankless water heater for RV, camper or travel trailer...Excel Gas Heater

Power source



With the Excel Gas Water Heater, you get a compact design that saves you space. The heater measures 11.6 inches width,   4.46 inches deep and 13.5 inches height.


Save yourself from cumbersome and costly installation of flues and ductwork with this vent-free RV tankless water heater. It is installed indoors and easily connected to the existing hot water piping.

The Gas and Water connections are 1/2″ NPT Male. You also get a free gas regulator LPG flare brass adaptor.


For optimal performance, the incoming cold water temperature should be above 50°F. In case the temperatures are lower (40°F), reduce the water flow rate to achieve desired results.

This best tankless water heater for RV, camper or trailer supplies you with over 96 gallons of hot water per hour (1.6 GPM or 5.5 liters per minute).

While at it, the water temperature will rise by 45°F.  This means that if the inlet water temperature is at 60 °F, you expect the heating unit to instantly deliver 96 gallons of hot water per hour at 1o5 °F.

Moreover, this on demand water heater comes with an exclusive magnetic water flow sensor technology enabling the unit to start at low water pressure. This means that you still get your hot shower despite low water pressure in your RV.

Whereas other tankless heaters may require at least 20-30 psi   to start up, the Excel Gas Water Heater only requires 2 psi and up to 120 psi water pressure.

Furthermore, you do not have to worry about a power outage or no power supply in the RV, camper or travel trailer. The hot water supply will not run out as the 2 size “D” batteries will ignite the electronic spark module.


The water heating unit comes with the Igniter Electrode electronic technology that requires no standing pilot. This allows you to save up to 25% gas consumption when compared to pilot lighted heaters.

The Excel Gas Water Heater’s pure copper (Oxygen free) heat exchanger   conducts and transfers heat fast and efficiently.

BTU Power Rating

38,000 Btus


The best tankless water heater for RV, camper or travel trailer comes with a state of the art ODS (Oxygen Depletion Safety shutoff device).

It is good to note that the ODS Vent-Free technology is to gas what a circuit breaker is to electricity.

The technology enables the water heating unit to shut off when low oxygen levels are sensed until the space is properly ventilated and enough oxygen introduced.


  • Fits in a small area
  • Low pressure start
  • Easy installation
  • Saves fuel
  • Awesome ventless design
  • Oxygen depletion sensor a great plus


  • Space above heater may get hot. Keep it open to dissipate the heat

Would you like to know if this tankless water heater fits within your budget?

>Click here to read user reviews and check today’s price on Amazon<<<<<

4. Takagi T-KJr2-IN-NG:

6.6 GPM Best Camper Tankless Water Heater

Best tankless water heater for RV, camper or travel trailer...Takagi T-KJr2-IN-NG Indoor


This on demand camper tankless water heater weighs 38 pounds and measures 20.25″ height, 13.75″ width and 7.75″ deep.


The 140,000 BTU tankless water heater for RV comes with a power cord which plugs to an AC 120V electrical outlet. The heating unit is vented via a 4-Inch category III stainless steel.

Please note that the water connection (¾ inch) location is at the bottom of the unit.


Depending on climatic conditions, The Takagi T-KJr2 can provide you with enough hot water for two bathrooms in warmer climates or one in cooler climates. With this best tankless water heater for RV, you get 6.6 GPM max water flow rate.

For temperature control, the unit comes with an Inlet, outlet thermistors for Energy factor of 0.81-0.83.

The Btu capacity ranges from 19500 BTUs to 140000 BTUs.

This camper  water heating unit has a Copper heat exchanger and Non-condensing technology.

For your convenience, a remote control is a standard feature with this tankless water heater.


For residential use, you get a limited warranty –15-year  on the heat exchanger and 5 year on parts. You also get 1 year labor manufacturer approved for warranty repairs paid directly to the authorized service provider.

When used commercially, you get 10 years on the heat exchanger and 5 year parts (residential only. 5/3 in commercial applications).

Warranties are only valid if unit is installed by a properly licensed technician.


Takagi T-KJr2-IN-NG has Safety features such as troubleshooting diagnostic codes freeze, overheat and surge protection


  • Maintain water at high temperature
  • Compact size
  • Simple connections


  • Need extra installation components like pressure relief valve stainless steel exhaust vents, hoses, fittings etc. for proper installation.
  • Make sure your gas line is ¾”
  • Professional installation required to claim warranty

Would you like to know if this tankless water heater fits within your budget?

>>>Click here to read user reviews and check today’s price on Amazon<<<<<

5. EcoSmart ECO 11:

Best electric powered Electric Tankless Water Heater for RV, camper or travel trailer

Best tankless water heater for RV, camper or travel trailer...EcoSmart ECO 11

This 11.8 KW compact unit fits nicely in your packed RV. It weighs 6.65 pounds and measures 11.5″ height, 8″ Width and 3.75″ deep. ECO 11 can provide hot water for one shower in colder climates, or two showers in warmer climates.

Power source



Fit this on demand RV tankless water heater to the 11Kw at 220V or 13kw at 240V single phase electrical power system.  Use 1/2″ CF Pipe fitting.


This heating unit is UL-499, ETL Listed certified.


Eco 11 activation flow is 0.3 GPM and you get to enjoy a hot shower from a 47 degree F inlet water temperature at 1.5 GPM.  As the climate warms up, the water flow rate improves.

For example, at 77 degrees F water inlet temperature, you still get the same 105 degree F hot water but the water flow rate improves to 3.5 GPM.

You can use the Ecosmart ECO11 in colder climates for low flow application such as a sink.

The inbuilt Digital display temperature control enables you have control of the water temperature as you set the temperature in 1 Degree increments.

Moreover, the heating elements are designed for durability and threaded for easier replacement. No wonder the lifetime warranty!

It is advisable to fit a filter to the cold water inlet especially for hard water filtering to protect the heating elements.


You will simply love the most advanced self-modulating technology which enables you to save up to 60% on the water heating costs.


For your convenience, you get a remote to control the water temperature


What about the Lifetime limited warranty for residential use…Wow!


  • Provides continuous hot water
  • Quite a space saver
  • Heater well built
  • Digital read out makes it easy to set desired temperature


  • Not good for very cold climates
  • To avoid voiding warranty, professional installation advised

Would you like to know if this tankless water heater fits within your budget?

>>>Click here to read user reviews and check today’s price on Amazon<<<<<

6.  Eccotemp i12-LP:

The  Sleek 3 GPM Tankless Water Heater for RV, camper or travel trailer

Best tankless water heater for RV, camper or travel trailer...Eccotemp i12-LP


This sleek black tempered glass paneled tankless water heater weighs 29 pounds  and measures  15”x24”x4”


You power this unit on liquid propane and only consumes gas when the hot water is on.


The Eccotemp i12-LP Tankless Water Heater is field tested and recommended for used at 5500 feet or less elevation.

You get to enjoy a flow rate of 3 gallons per minute from this best RV tankless water heater. Moreover, the temperature is raised by 35-40 degree F temperature rise when operating at flow rate of   3GPM and 77 degree F with a 1.5 GPM flow rate. The hot water capacity range is 0.6 – 4.8 GPM.

Furthermore, you get to precisely manage the water temperature via the fully automatic temperature controls. While at it, the touch screen LED temperature displays the output temperature and GPM flow.

Moreover, you get the Tested-Safe Electronic Ignition System which saves up power.

The BTU capacity

BTU capacity is between 25,000 BTUs minimum and 80,000 BTUs maximum.


The Eccotemp i12-LP Tankless Water Heater is wall mounted indoors to vent behind the wall. This on demand tankless water heater for RV comes with a ready to install horizontal stainless steel vent kit.  Connect the water heater to 1/2″ NPT water fittings and plug it to a 110V electric outlet.

Energy efficiency

When idle, this 80000 BTU water heater pulls about 2 watts and 1.07 Amps when in operation.


This  tankless water heater for RV, camper or travel trailer has UL listed electrical components. Should you have children around, make use of the Child locking technology to prevent those prying little fingers from adjusting the controls.

Power ventilation for safety and efficiency.


You get a limited five year replacement of defective parts after installation or 30 days after date of purchase- whichever comes first.  The unit also comes with a Ten year limited warranty on replacement of heat exchanger when used by a single family (2 years for commercial use). In both cases, labor is NOT inclusive.


  • Quickly heats up the water
  • You can shower and wash dishes at the same time
  • Modern attractive look
  • You will love the Touchscreen and Easy to use digital control
  • Quiet operation
  • Spare parts available from the Eccotemp online store


  • Freezing air temperature may freeze heat exchanger. You may need to drain water if freezing temperature is expected or add a backflow preventer / termination hood to prevent cold air from entering the heater.
  • Not recommended for use above 5500 feet elevation

Would you like to know if this tankless water heater fits within your budget?

>>>Click here to read user reviews and check price on Amazon<<<<<

Tips and precautions when using the RV tankless water heater

Although the camper/trailer tankless water heater is easy to utilize, proper use will prolong its life and save you time and money. Here are some helpful tips…

On receipt

Thoroughly check and ensure you have received all the components that should be in the package. Be on the look-out for damages, defects leakage or spillage. In case of any issues, take advantage of the return policy to get the unit replaced or get the warranty activated.


Where possible make use of brass nipples and fittings. Galvanized fittings may eventually corrode and leak at the threads. With the constant heating and cooling, plastic fittings expand and eventually the crack at the threads of the camper tankless water  heater.


Follow the manufacturer instructions when cleaning, flushing, draining and restarting the camper tankless water heater. Always remember to switch off the power and shut off the water valves.

When removing the valve cap, take great care to slowly remove it from the service ports on hot and cold water valves.

Chemicals may cause damage to the water heater. Use the cleaning agent recommended by the manufacturer.


  • Keep the  best  camper tankless water heater hot water lines as short as possible and well insulated.
  • Turn on the hot water tap slowly to allow the air can pass via the pipe.
  • For those hot water points that are far from where you have installed the RV tankless water heater, it might take some to have hot water flowing. The time taken is a factor of distance, inlet water temperature and water flow rate.
  • Faster flow rates or cooler inlet temperatures may also result in lower water temperatures at the most distant water outlet

Energy saving

The cost of operating a pilot light in a tankless water heater varies from model to model. Ask the manufacturer how much gas the pilot light uses for the model you’re considering.

If you purchase a model that uses a standing pilot light, you can always turn it off when it’s not in use to save energy. This device resembles the spark ignition device on some gas kitchen ranges and ovens.


It is recommended that you have a carbon monoxide detector especially when using LPG or natural gas


Flush, drain and clean the  travel trailer tankless water heater before storage.


You cannot afford to wait for the  RV, camper or travel trailer tankless water heater to fail so that you can get to replace it. The need for hot water will certainly not wait!

Plan in advance so that you have time to select the most appropriate heating unit. Remember that you may need to adjust the existing gas lines, water faucets, vents etc. to accommodate the preferred unit.

Final thoughts on the tankless water heater for RV, camper or travel trailer

The best RV, camper or travel trailer tankless water heater is a great appliance to install in your recreational vehicle.  Furthermore, the water heating unit is small enough to find a place in the available space. What about the endless supply of hot water as and when needed! Moreover, the energy saving features in the unit saves your pocket too…

Enjoy your day as you look forward to that endless hot shower…..

Remember to keep your  room safely heated with the most energy efficient space heater

And to get  a  baby  safe heater click  here. It also safe for you.

Vicky Geem

Hi there, I'm Vicky!- an ardent reader, researcher and writer. And I love breathing in cool, clean, healthy air. No wonder the interest in information and products that cool, heat, moisturize or purify the air in our living spaces. At BestAirconHeaters.com, I share this information with you in a way that helps you make better and wiser decisions. When I’m not reading, researching or writing, you are most likely to find me enjoying the cleaner air outdoors. Or minding what I eat as I tend to my kitchen garden, picking some and ... meet you in the kitchen! Or contact me on email vickygeem@gmail.com  or facebook/vickygeem

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