5 Best Electric Tankless Water Heaters For RV

 I hope you agree with me when I say 

 “Your RVing adventures become more comforting when you have a supply of hot water in your RV” 

RV instant water heater becomes the most important equipment when you plan to live in an RV. 

It will be essential for you to make sure you are getting the hot water on demand in all the necessary places of your RV like the kitchen sink and bathroom shower.

In compact spaces like in an RV, the tankless hot water heater is always the best choice. Tankless heater occupies less space and gives RV hot water on demand. To make your search easier, we have listed the best electric tankless water heaters for RV.

If you need more RV info, also check out, The best 5th wheel RVs for full-time living and 6 Best RV Washer Dryer Combos to Buy in 2021

Let’s dive in!

5 Best Electric Tankless Water Heaters for RV in 2021

Here is a list of the 5 best electric tankless water heaters for RV

5 Best Electric Tankless Water Heaters For RVRating
1. EcoSmart ECO 11 Electric Tankless Water Heater
10/10 (Editor's Choice)
2. Rheem Heating Chamber RTEX-13 Residential Tankless Water Heater9/10
3. Eemax EEM24013 Electric Tankless Water Heater9/10
4. Bosch Electric Mini-Tank Water Heater Tronic 3000 T 9/10
5. BoschTronic 3000 Electric Tankless Water Heater 8/10

1.EcoSmart ECO 11 Electric Tankless Water Heater


  • Self-modulating technology
  • Energy efficient
  • Saves heating cost
  • Lifetime warranty 



✅ 99.8-percent energy efficient❌You will need a 60 amp breaker
✅ Save up to 60-percent on your water heating cost
✅ Easy Installation due to small size
✅ High quality built in materials



2.Rheem Heating Chamber RTEX-13 Residential Tankless Water Heater


  • 99.8% energy efficient
  • Digital temperature display
  • Durable copper immersion
  • Most advanced self-modulation
  • Simple installation 
  • LED display


✅ External adjustable digital thermostatic control❌Low flow rate
✅ Save up to 60-percent on your water heating cost❌ You will need a 60 amp breaker
✅ Simple installation
✅ Durable Copper immersion two heating elements

3.Eemax EEM24013 Electric Tankless Water Heater


  • Instant heater
  • Compact size
  • Advanced self-modulating technology
  • Stainless steel material



✅ Instant hot water❌Compatible with only 1 shower/ sink at any given time.
✅ Self-modulating technology❌ It makes a shrill whistle noise sometimes.
✅ Compact size saves valuable storage space
✅Consistent and endless hot water


4.Bosch Electric Mini-Tank Water Heater Tronic 3000 T


  • Easily mounted
  • Fast recovery rate
  • Long-lasting quality
  • Convenient hot water heater



✅ Easy Installation❌Low element life
✅ High-quality material❌ Limited water supply due to its mini tank.
✅ Compact size can be mounted under the sink
✅ Instant hot water


5.Bosch Tronic 3000 Electric Tankless Water Heater


  • Durable plastic construction
  • Efficient design
  • Ideal size
  • Flexible installation
  • Electric tankless water heater



✅ Can be installed in a 360 degree orientation❌ It barely puts out Luke warm water
✅ High-quality material❌ Lower flow rate
✅ Smaller size can be mounted under the sink
✅ Instant hot water

What is an RV Electric Tankless Water Heater? 

An electric tankless water heater uses electricity, you just have to plug it in and go. You can use electricity within the electric chamber of your RV and a standard electric heater uses 120V  in the case of a high voltage heater, you can use an inverter to run it.

You can also use a generator or external electricity source for it. The most simple and clean way to get hot water is by using RV electric tankless water heater.

RV tankless water heater pros and cons

When we read the RV propane tankless water heater reviews or Suburban tankless water heater reviews, it shows that there are some propane and gas RV tankless water heater pros and cons. 

The cons are you always need to carry propane tanks with you. In some places, propane is not available. In the case of gas heaters, you always need a supply of natural gas or a gas supply with you. It is not always possible to have a gas supply where you park your RV

However, in the case of an RV electric tankless water heater, you don’t need any external supply for heaters.

Buyer’s Guide - How do we choose the best tankless water heater for RV?

A tankless water heater increases the comfort for you and your family in RVing adventures. The supply of warm water has become essential in RVs. 

So adding the best suitable tankless water heater in your RV will enhance your traveling experience or if you are living in it it will be the most important equipment in your house like RV. 

Before buying the best suitable water heater according to our needs we need to consider these factors. 

What size do we need? 

We need to consider the size of the water heater that which size would be suitable for us, and also how much space do we have in our RV.

To consider the flow rate is also important. An average rate of 2.4 GPM Will be sufficient for sink use or if they’re one person bathes and another wash the dishes then you need up to 4GPM water flow rate of the heater.


Tankless water heaters are easy to install because of their smaller size. However, you need to consider which pipe sizes are compatible with your water heater.

In the case of an electric water heater, according to some manufacturers, you may need a certified electrician otherwise you may lose your warranty.

Source of POWER.

While selecting the right electric tankless heater for your RV you need to consider how much electricity does it requires. Commonly 240V electricity source is required so you can use an inverter or a power generator for that.

Electric heaters come in many sizes so if you consume less water then buy a smaller water heater with low power needed.

Temperature Adjustability.

A good electric water heater comes with an adjustable temperature system.

All the tankless electric water heaters mentioned above have temperature adjustable systems in them. 

These electric heaters will only go to certain temperatures that you will adjust and then turned off. This way you can save 70% of your money and energy.

Installing a tankless water heater might be tricky sometimes. Some manufacturers ask you to install your water heater by a certified electrician to get its warranty. In this video, you can see the simple installation of an RV electric water heater.



How to convert RV water heater to tankless?

To experience the benefits of a tankless water heater let’s just discuss how to convert an RV water heater to tankless.

  • Disconnect the old standard water heater from all of its supplies (electricity, propane and water supplies, etc)
  • Unscrew the old water heater and cut around the seal of the water heater carefully.
  • Take out carefully the water heater from where it is installed.
  • Clean the location where a new tankless heater is to be installed.
  • Clean all the residue and dust before installing the new tankless heater.
  • Take the measurements of dimensions with the measuring tapes before making holes for the new tankless heater
  • Place the new tankless water heater carefully and caulk around the gap for sealing then screw it and make sure no gap is left uncaulked.
  • Connect the wiring 
  • Connect the hot and cold pipes
  • Install the control panel and check it if is working properly.
  • Turn the water on to see if it is working.

RV tankless water heater problems.

  • Mineralization of water causes blockage in pipes.
  • The system can be overloaded with excessive usage.
  • High Cost of maintenance and installation when it is done by a professional electrician.
  • Hot and Cold water sandwich and limited supply
  • Ignition and flame failures

FAQs – Frequently Asked Questions

Q: Would this be able to supply a shower?

A: A standard flow shower head is around 2.5 GPM. At a low flow rate, it gives around 1.5 GPM. 

In an instant electric tankless water heater, a low-flow head will give you continuous hot water supply to the shower. 

Q: When we turn on the water heater, what will happen with the water filled in the cold pipes?

A: When the tap is opened, the hot water in the unit flows out. The colder water that was sitting upstream of the unit, enters the unit to be heated.

 If the tap remains open, the newly heated water flows out, being replaced eventually, (depending on the distance to the main water heater), with the water from the main water heater.

You will probably set the unit temperature to equal the main water heater temperature if you want to keep a constant temperature, but other scenarios are possible.

Q: Is it expensive to run?

A: No not at all. It is not like a recycling system that runs all of the time. I have a 4 gal unit it heats the water and it is well insulated so the water stays hot. This provides instant hot water for the kitchen. As it refills with the cooler water from the long hot water line it turns on again reheating the water to set temperature very quickly then shuts off. 

Q: what amp breaker is required?

A: The National Electrical Code requires conductors and overcurrent protection to be sized at 100% of the manufacturer’s branch circuit recommendation for tankless electric water heaters.

 A 60 amp breaker is the same price as a 40 or 50, it is the wire that costs more. #6 AWG wire is required for a 60 amp circuit.

 If you undersize the wire it could overheat and catch fire. Protect your family and follow the manufacturer’s sizing for this, or any other, electrical device. Your family’s lives are worth the extra money.

Q.what is the wiring and power requirements?

A: The power requirement is 60 amp breaker and number 6 cable in wiring.

Q: Would this work for the camper sink/shower?

A: I don’t see why you can’t if you have space, adequate power, and water source. 

Keep in mind, when you are using a tankless electric water heater then it will supply instant hot water on demand in the sink, and in case of a shower, some heaters give continuous hot water with slow head flow water.

Q: Has anyone installed this in an RV?

A: Many have installed an electric tankless water heater in their RVs. They placed it under the kitchen sink where the original water heater was at. Many of them posted reviews online. It really increases the comfort of their RVing adventures.

 So, get yourself a top-quality Electric Tankless Water Heater and increase the comfort of your RVing adventure. 

Hey! I’m Mark Polk, an author, camper & public speaker on anything & everything RV related. I have educated millions of RV consumers on safely and properly usage through my movies (i.e. TRV Education 101: RV Care and Maintenance 2009) Writing about this industry is a huge passion of mine, so here’s a little piece of my mind.