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RVs with a hot water tank can come in handy in several situations, especially if you are hiking, biking, or other escapes including your family or friends. However, an average RV hot water tank is only able to hold between 5 to 10 gallons of water.

Thus, this limited water holding capacity becomes an issue if a group of five or a family all wants to enjoy a nice warm shower after having a lot of fun outdoors.

Fortunately, with tankless water heaters, you don’t have to bother about any hot water tanks. It comes with a lot of benefits including an endless amount of water that can be used in the RV. But, there are about hundreds of them in the market right now, making choosing the perfect product challenging.

Top 7 Best RV Tankless Water Heaters Reviews 2019

Stiebel Eltron 224199 Tempra 24 Plus Whole House Tankless Electric Water Heater

This tankless water heater manufactured by Stiebel Eltron is powered by electricity. Tempra 24 Electric Water Heater features several advanced systems in the industry. From the customer’s perspective, it’s a consensus that this portable tankless water heater is one of the best out there.

To begin with: this model integrates an Advanced Flow Control features to help ensure users get hot water flowing continuously in your RV. Irrespective of how big the demand for your hot water supply is, this unit is up for the task. Basically, it is designed to supply enough hot water for average to extended families.

That’s not the best part. Stiebel Eltron made some significant improvements to the Tempra Tankless Electric Water Heater such as hinged cover for hassle-free access, upgraded electronics, and flow sensor design. Plus, it comes in a sleek and slim design making it easy to fit into any vehicle requiring more space.

This unit has a 5.4 GPM water flow rate, one of the highest in this review. According to the hundreds of reviews, Tempra 24 Plus Tankless Electric Water Heater offers stable temperature, unlike other cheap water heaters with fluctuating temperature. Also, there’s no need to vent, since this unit is powered by electricity. However, if this water heater must meet up with your demands of hot water supply, then you must ensure it gets enough power supply in your RV while you are on the road.


  • Durable and reliable
  • Efficient temperature controls
  • A constant flow of hot water
  • Ideal for large families


  • 3-year limited warranty

Eccotemp L10 2.6 GPM Portable Tankless Water Heater

The Eccotemp L10 Portable Tankless Water Heater is another excellent option for RV owners looking to get their hot water supply demands met. Among several incredible features this unit sports, its portability is quite impressive. Plus, you can install it permanently for outdoor use. Thanks to its rugged build construction, you don’t have to worry about this dealing with harsh outdoor conditions.

This tankless water heater is powered by propane to supply users with a hot water flow of 2.5 GPM, which makes it great for all outdoor needs including showering. Another impressive feature is its 2 D cell battery for ignition, and would only start water immediately starts running.

What’s impressive about this feature is that it reduces this water heater chances of getting overheated. With that, people living in off-grid areas or places with limited electricity will find using Eccotemp L10 Portable Tankless Water Heater easy. Featuring an automatic 20-minute shut-off function, which helps minimize the risk of this appliance overrunning and causing a fire.

In addition to that, setting up Eccotemp L10 Portable Tankless Water Heater can’t come any easier. All fittings and accessories for the easy, and correct installation are provided in the package. It comes with a standard half-inch fittings ensuring its easy to plumb into any standard fixtures.


  • Very portable
  • Rugged design for permanent installation outdoors
  • Lowers risk of overrunning and overheating
  • Quick to activate
  • Easy to install and set up


  • The heating box is a bit heavier than other models

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

The Takagi Indoor Tankless Water Heater is one of the best portable water heater available today on the market. With this unit installed in your RV, you should expect endless as well as instant hot water supply any time.

Besides that, this heater is an excellent option not only for RVs alone, but also around the house, in the campsites, or the cabins. It offers an incredible bunch of benefits and meets most users demands of hot water supply.

Takagi Indoor Tankless Water Heater monitors the temperatures of both the output and input of water ensuring they remain in a steady phase. It gives 140,000 BTU and 6.6 GPM of water flow rate, which is one of the highest in this list. Its unique design allows users to use two faucets at the same time.

This unit is a gas water heater, and, as such, it requires outdoor venting – precisely, stainless steel venting in 4-inch category III. Takagi Indoor Tankless Water Heater is more energy-efficient when compared to other electric water heaters.

Also, this unit is certified by Energy Star for efficiency even with an energy factor between .81 to .83. No doubt, this model is not one of the highly efficient water heater available on the market; its affordable price makes Takagi Indoor Tankless Water Heater an attractive choice.


  • Portable
  • Versatile tankless water heater
  • Easy to use
  • Affordable price
  • A high rate of water flow


  • Require venting
  • Warranty becomes void if not installed by technical know-how from Tagaki

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

For those looking for a commercial or residential indoor tankless water heater, then going for Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater is advisable. There are a number of reasons why this unit has gain the respect and love of its customers out there. And, some of those reasons include using propane or natural gas and multiple venting options.

While Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater comes in a compact and sleek design, for some people it’s quite heavy. It features on the front panel buttons for controlling water, gas, and, power.

That’s not the best part: this appliance has a lock key feature on the temperature button, which helps avoid any unauthorized access. Also, the locking helps ensures the temperature of the water is to keep constant to avoid being too hot for either your kids or seniors at home.


  • Quiet
  • Compact and sturdy design
  • An endless supply of water
  • Ultra low NOx emissions
  • Energy efficient


  • Not easy to install
  • On the pricey side


For those looking for a product powered by propane or natural gas, then this Tankless LPG Gas Water Heater by Excel is recommended, as it’s excellent for a wide range of applications and uses, such as flats, RVs, small apartments, sailboats, hunting cabins, mobile homes, rural cabins, and campers.

This incredible unit saves both energy and water by ensuring it provides you with hot water immediately you turn that tap open. Plus, it comes in a unique, and beautiful design. As a matter of fact, it works to add more value to that area overall aesthetic.

Another impressive feature is it allows users to enjoy a pressured water from 2 – 120 psi. This product is designed to be easy to use and install anywhere without having to deal with a cumbersome process; thanks to the vent-free design.

What’s more? Excel Tankless LPG Gas Water Heater function great with incoming water temperature above 50 degrees Fahrenheit. Also, it handles lower temperature when you reduce and adjust the water flow rate using the control knob.


  • Save both energy and water
  • Supply hot water instantly
  • Features a beautiful and unique design
  • Magnetic flow sensor


  • Comes with an unclear installation instruction
  • Low GPM

PrecisionTemp RV-550 Tankless Water Heater

The PrecisionTemp Tankless Water Heater is specially engineered to meet the demands of your mobile washing services, small homes, RVs, trailers and so on. This unit comes in a small size that only eat up about half the space a 10-gallon tank occupies.

This model is not as heavy as most standard water heater available on the market. This PrecisionTemp Tankless Water Heater only make sure of less propane without compromising the efficiency of this heater.

It does not feature a pilot light. The PrecisionTemp Tankless Water Heater comes with advance VariFlame technology control system, which makes this product a bit reliable. Most customers find this model very useful, since its design, assembled, as well as tested in the USA.


  • Efficient to use
  • Consume less gas
  • Compact
  • VariFlame technology control system


  • On the pricey side
  • Low GPM

Camplux 5L 1.32 GPM Ventfree Outdoor Portable Propane Tankless Water Heater

Camplux 5L Portable Propane Tankless Water Heater comes with many impressive features including its distinctive portability property. It is indeed portable allowing anyone to carry this product from place to places easily.

Another incredible feature works well with minimum energy requirements. Hence, RV owners will find this product suitable, especially families or a group of 5 or more who loves to be on the road a lot. This unit is convenient and uses for them, even in places with limited hot water supply.

Plus, this propane water heater is designed in a small size means it’s easy and convenient to set it up outdoors. Besides that, it comes with a brass-finished regulator with one knob for controlling the heat and the other for controlling the flow rate.

The most significant advantage of this model is its ability to adjust flow rate and make sure you get the right water temperature. Another incredible benefit of running only on propane without needing electricity. Hence, it’s a top choice for people living in off-grid areas.


  • Portable and easy to tag along
  • Work with minimum energy requirements
  • Operates without electricity
  • The flow rates and heat controls


  • Does not feature a draining system or outlet.

Things to Consider When Purchasing an RV Tankless Water Heater

When choosing the best product for your RV, some important things should influence your choice:

Gas or Electric

This is the first factor to put into consideration if you want the right tankless water heater for your RV. do you want the unit to be powered by gas, electricity, or both? For off the grid, more remote, areas, purchasing a model powered by gas is the best choice. Also, do not forget that propane, in high elevated areas will burn less efficiently.

Entire Home or Portable System

Whether your RV needs a home system or portable system is the next factor to consider before making a choice. However, it’s important to know that going for portable water heaters means you need a low output of hot water.

Water Usage

When shopping for a water heater, it’s advisable to know precisely the demand for hot water supply. A dishwasher needs about 1.5 GPM, an average shower not more than 2.1 GPM flow rate, hot water faucets needs about 4 GPM.

Hence, make sure you the new water heater has a flow rate capable of meeting your requirement before making a purchase – particularly for RV owners with lots of occupants, which will require you to simultaneous run at least one hot water application.

Why a Tankless Water Heater is Useful in an RV

Tankless water heaters offer a bunch of benefits over their conventional counterparts, including:

  • They come in a more compact design since it eliminates the need to make space for a tank.
  • water heaters with tanks use up to 50 percent more energy than tankless water heaters.
  • A tankless water heater is great for reducing the amount of water wasted.
  • Tankless water heater tend to be durable than heater with tanks since they prone to leaks.
  • Tankless water heater offers an endless hot water supply since the amount of water you can use is not limited the tank size.