The 5 Best Tankless RV Water Heaters of 2020


Best Tankless RV Water Heaters

Are you someone who camp frequently in your recreational vehicle with your family. Then you will definitely know the importance of hot water in your RV for showers, especially during winter months.

They come as an excellent alternative for water heaters with tanks as they are space-efficient and highly functional as well. These heaters help a large group with nice and warm showers with an unlimited supply of hot water.

As there are a number of water heater brands out there, we have listed the top five best brands to help you with your product selection, along with the buying guide to refrain your choice. We hope this guide helps you with the best product for your recreational vehicle.


Best Tankless RV Water Heaters

Quick Answer: The 5 Best Tankless RV Water Heaters – [2020]

  1. Ecosmart ECO 18 Electric Tankless Water Heater
  2. Stiebel Eltron Tankless Water Heater
  3. Camplux Outdoor 2.64 GPM Digital Display Tankless Water Heater
  4. Eemax EEM24013 Electric Tankless Water Heate
  5. Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters

Best Tankless RV Water Heaters Reviews

#1. Ecosmart ECO 18 Electric Tankless Water Heater


Ecosmart ECO 18 Electric Tankless Water Heater At a Glance:
  • Highly durable water heater
  • Easy to use a tankless heater
  • Comprises of copper and other stainless components
  • Lifetime warranty with residential use
  • Saves up to 60% on water heating costs
  • With this water heater, you will never run out of hot water
  • Saves a lot of storage space
The Eco18 is an excellent electric tankless electric heater with a self-modulating technology. this heater is capable of heating two showers and sinks at the same time in warm climates and one shower and one sink in winter months.

It features a digital temperature control that allows the user to set outlet temperatures in increments of 1 degree. This compact, stylish, and durable heater is more about 99% energy efficient and is pretty easy to install.

This water heater is capable of producing endless hot water on demand. It is capable of heating water when water passes through the unit. it doesn’t have any tank to store water. This heater supplies you with hot water on demand and it thus helps in cutting down energy costs and heat loss as well.

The wall mounting design of these water heaters frees up a lot of floor space and thus enhances its storage options. Its self-modulating technology takes up only limited space as desired by the water heater.

#2. Stiebel Eltron Tankless Water Heater


Stiebel Eltron Tankless Water Heater At a Glance:
  • Extremely comfortable and reliable water heater
  • Digital displays
  • Excellent energy efficiency
  • Advance flow control
  • Completely silent operation
  • Smart and compact water heater
  • With this heater, you will never run out of water
This water heater features a flow control German patent technology to help maintain constant water temperature for maximum comfort. It is an excellent water heater that offers constant hot water without any interruption.

This water heater comprises a small and sleek design and helps to save space to render constant hot water for the entire RV. It does not require any venting and its eco-friendly device helps to save energy with auto-modulation and to measure the water flow electronically. Its savings monitor shows your energy costs as well.

The heater is easy to operate and its electronic flow sensor makes use of a solid copper interior heating system of the water heater. The heater is noise-free when in use and has a digital temperature display and preset temperature buttons.

This heater makes use of a minimum household electric service of 150 A and renders an output water temperature of 140 F or 86 degrees. With this heater, you can be sure of the highest levels of reliability and comfort.

#3. Camplux Outdoor 2.64 GPM Digital Display  Tankless Water Heater


Camplux Outdoor Tankless Water Heater At a Glance:
  • Portable Tankless water heater
  • Low water pressure startup
  • Reaches a maximum temperature of 46 degrees Celsius
  • Anti-freezing protection
  • Oxygen depletion safety shut off protection
  • 32 gallons of hot water output
  • Energy-saving technology
  • Offers endless hot water in camps and RVs
This is an excellent water heater for camping, during family vacations, and even in recreational vehicles. As it comprises of oxygen depletion sensor protection, you can use indoors as well. It worked great even at low water pressure and renders excellent performance as well.

This gas water heater is ideal for drinking water as well. This heater works great with a 12V water pump and the maximum temperature rise of this heater is 46 degrees Celsius. As this heater comprises a portable handle, it is convenient to set up outdoors.

This heater helps with overheat production, thanks to its flame failure protection and anti-freezing protection. The heater also has an oxygen depletion safety shut off protection and renders about 13.2 gallons of hot water output per minute.

This tankless gas water heater is ideal for cabins, campsites and to use around the house as well. The ignition of this water heater is with 2 D cell batteries and it is thus great for off-grid areas where electricity is not accessible.

#4. Eemax EEM24013 Electric Tankless Water Heater


Eemax EEM24013 Electric Tankless Water Heater At a Glance:
  • Renders constant supply of hot water
  • Supplies instant and consistent hot water
  • Self-modulating technology
  • Units adjust according to the energy requirement
  • Its compact size saves storage space
  • Ideal to use in both commercial and residential settings
The Eemax electric tankless water heater helps with endless hot water, irrespective of when and where you will need it. This water heater can be used for both residential and commercial water heating needs.

This heater can produce about one sink of hot water in colder climates or one shower and one sink of water in warmer climates. You can benefit from its instant heater to help inconsistent and endless hot water.

The compact size of this water heater saves a lot of storage space and it is important to check its size requirements and water production capabilities before buying the heater.

It is good to use a water filter with this heater to keep the deposits down if you feel your water source is rich in minerals. The biggest plus of this water heater is its full range temperature controls, that easily adjusts from the front of the unit.

#5. Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters


Eccotemp Tankless Water Heaters At a Glance:
  • Propane-powered tankless water heater
  • Ideal for indoor installation
  • Offers efficient power ventilation
  • Easy to read digital temperature display
  • Safe electronic ignition system
  • Plugs with standard 120v electrical outlet
  • Offers a minimum 0.65 GPM flow rate
This is an excellent indoor gas-powered tankless water heater that is efficient for rendering hot water on demand. It is ideal for indoor installation and offers efficient power ventilation as well.

The heater comprises an easy to read temperature displace tat is compact, space-saving, and with minimal noise output. It plugs into a standard 120v electrical outlet and features a safe electronic ignition system.

This heater makes use of propane flame to heat water instantly and as long as you have water in storage, hot water will keep coming out. it installs right out of the box and is an excellent option for cabins and small homes. It is a manual heater and thus adjustments are easy with the help of knobs on the face of the unit.

Buyer’s Guide For Best Tankless RV Water Heaters

Best Tankless RV Water Heater

What is a Tankless water heater and how does it work?

A tankless water heater is a valuable appliance for your recreational vehicle, as it helps you with a constant supply of hot water for showers and to wash vessels. It does not require a storage tank.

You can get hot water instantly from this device, without waiting for a long time. It can be a luxury addition for those who travel constantly and wish to relax adequately.

The tankless water heaters are also known as on-demand or instant heaters that renders hot water only on demand. It coils heat up the water directly and does not store water in a tank.

It heats water with an electric element and thus is capable of rendering a constant supply of hot water. in some heaters, propane gas can be used to heat up the water. Such heaters render a higher flow rate when compared with those that use electric elements.


What to look for in the tankless water heaters for RVs?

Tankless water heaters can be a wonder appliance and addition to your recreational vehicles. They connect with the water tank on board and supply the users with hot water on demand. There are a number of such water heaters available online. But, it is important to look for the following features to justify the money spent on water heaters.

  • Water capacity
  • Water consumption of the heater
  • Heating capacity
  • Source of power
  • Water flow rate
  • Space occupation
  • Protective features
  • Budget

Water Capacity:

The majority of the RV water heaters have a capacity of about 6 gallons to 10 gallons. They take time to heat up the water and might require some waiting time between showers.

The best alternative is to go for a tankless heater that heats up water on demand. It won’t use much of gas or electricity and it is pretty much economical as well.

Water Consumption of The Heater:

You can leverage the right heater, knowing exactly how much hot water you would require on a regular basis. Before investing in a unit, consider the places where you will need hot water and the quantity of hot water you will need approximately.

For instance, you may need hot water in the bath area and in the kitchen for the dishes. Tankless heaters can provide about 6 gallons of hot water every minute, but this again varies with the model.

Heating Capacity:

The British Thermal Unit or the BTU is the heat capacity that these heaters can provide. Most of the units have a BTU of 30,000 to 50,000 which is slightly lesser than what we get at our house. You may require heaters with higher efficiency when you have to heat up groundwater, which can be very cold at times.

Source of Power:

The power source of the water heater decides on the type of water heater you can buy for your recreational vehicle. Tankless water heaters can have three power options such as electric only heaters, liquid propane heaters, and the combination of both. The best option is to buy heaters that have a combination of both, but it can be slightly heavier on your budget.

Water Flow Rate:

The water flow rate is the most important, yet the most overlooked feature in an RV water heater. The flow rate is the quantity of hot water that the device can release every minute. Heaters with a flow rate of 2-2.5 gallons should be ideal for an average family size of four, as most people use these heaters while taking a shower.

Space Occupation:

It is very crucial to find the quantum of space that the water heater can consume. Space is indeed an important factor for compact structures like an RV or a camper. Before buying a water heater, check if the RV still has enough space to install a heater inside.

Also, check the size of the heater and decide if it can fit in the space allotment. As far as possible, choose lightweight models so that there is not much difficulty in handling them.

Protective Features:

Make sure that you are buying a heater that renders enough and more protection against the rough weather and rough terrains, as they will mostly be in transit in the RV. Also, look for features to protect the heater against voltage shortages and spikes and electric outrages secondary to excess heat.


Budget is the most important consideration to make before investing in anything. Tankless water heaters for RVs are available at the cost of $500 to $1000. However, some high-end models can cost more. The professional installation of the heaters costs a little higher. It is better to set a budget before investing in the product.


Tankless RV Water Heaters Buying Guide:

How to install an RV water heater?

The process of installation depends on the model that your buy and it is better to take professional helps in getting the installation done.

Will it be a good idea to install these heaters under the RV sink?

Yes, there are water heaters available specifically for this purpose. Such heaters work great for the kitchen, for hot faucets and to power dishwashers and washing machines as well. Also, installing them under the sink ensures that outside temperatures don’t affect their flow rate.

What are the best tankless RV water heater brands?

Some of the best tankless water heaters for your recreational vehicles have been listed in our produce review section. Within them, Ecotemp and Ecosmart are the best options.


Best Tankless RV Water Heaters

Advantages of Using a Tankless Water Heater:

Tankless water heaters for recreational vehicles are of two types, portable heaters that are super easy to use on the road and camping and home systems heaters that act as a permanent installation on the recreational vehicle. Having a tankless water heater in the RV can actually save a lot of space. There are also a number of other advantages to look forward for. Those advantages are,

  • With the help of a tankless water heater, there will not be any cold showers. As there are no tanks to empty there is absolutely no need to worry about running out of hot water. This tankless water heater helps in delivering water on demand if only you turn on the hot faucet.
  • This tankless water heater helps in conserving water as it begins to heat up as soon as you require it. It also heats the water a lot quicker and also limits the amount of water that goes as waste.
  • As these heaters comprise a compact size, they serve as a perfect choice for trailers and RVs. These heaters also can be placed in multiple locations; in fact, you can install it in a small space beneath your kitchen sink too.
  • In heaters that possess a water tank, there are all chances for the water to stay and corrode its elements, resulting in unpleasant rust, stains, and odors. But as the tankless water heaters don’t store any water, you don’t have to worry about water contamination or smelly stagnant liquids.
  • A tankless water heater is definitely an investment and it can last for many years. If you have a portable unit, then you can count on its durability.
  • A tankless water heater offers a warranty of about 10 to 15 years, while a standard unit has a lesser warranty.


Tankless RV Water Heaters Maintenance Guide:

To make sure that your tankless water heater lasts for many years and works pretty much efficiently, it is important to clean the water heater every now and then, preferably once or twice a year. In order to clear the device efficiently, flush out the device, and remove any mineral deposits or dirt from it.

  • Disconnect the gas and the electricity supply to the appliance before cleaning the process.
  • Place both the pump and the open end of the second hose in a bucket and fill it with five gallons of white vinegar.
  • Open both the hot and cold isolation valves. Turn on the pump to circulate vinegar through the system for 45 minutes.
  • Place the open end hose in the bucket and turn on the cold water supply valve, to allow the water flow into the bucket for five minutes.
  • Turn off the hot water isolation valve and remove the inlet filter screen.
  • Rinse completely to remove sediments and reinstall the heater.


Final Words:

RV tankless water heaters are ideal solutions to help you with a steady supply of hot water when you are camping with your family in your recreational vehicle. We hope out product recommendations and our guide will help you in choosing the best product for your recreational vehicle. Why shower in the cold when you camp when you can get access to piping hot water anytime.


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