Best Tankless Water Heater for RV – 2020 Reviews & Top Picks

There’s nothing worse than getting part-way through a journey in your recreational vehicle (RV), only to find you’ve run out of hot water. Having no hot water makes everything from taking showers to cooking much more difficult. Unfortunately, water heater tanks take up a lot of room and add weight to your RV. That’s why so many people now look for tankless solutions. If you want the best tankless water heater for RV use, you will find some great options here.

Our Picks: Best Tankless Water Heater for RV

Scroll down to see our individual review of each product

How much space does a tankless water heater take up?

The size of a tankless water heater will differ depending on the manufacturer. With the right amount of research, you should be able to find one that suits your needs. They can range anywhere from eight to 15 inches in length, with comparable sizes for the width. You also have to consider depth, as some tankless water heaters stretch back over 25 inches. Make sure you have space in your RV for the heater you’re looking at.

How does size affect output?

Generally speaking, the size of your tankless water heater will affect how many gallons per minute (GPM) of water it can output. Small heaters offer lower GPM than large heaters, but they’re also more portable. You’ll often find that larger units also have high British Thermal Unit (BTU) ratings. The higher the BTU, the faster the unit heats up your water.

Do you need to take safety precautions?

Safety isn’t usually a concern with tankless water heaters, but there are some issues that can affect their performance. For example, you will find that even the best tankless water heater for an RV struggles to reach peak performance in freezing cold weather. You may need to account for issues like this during winter trips.

1. Camco 11673 Hot Water Hybrid Heat Kit

Best Tankless Water Heater for RV

You can use this hybrid kit with any six-gallon liquefied petroleum (LP) water heater to convert the LP to 120 volts of electricity at the flick of a switch. Camco’s hybrid kit comes with a detailed set of instructions making it easy to install. You also receive a mounting bracket, so you don’t have to take up valuable floor space. It’s one of the smallest kits on this list, and it’s one of the best tankless water heaters for an RV for small vehicles.


  • Small size makes it portable
  • Comes with excellent illustrated instructions
  • Capable of converting LP to electricity
  • Features a thermostat to control water temperature


  • Takes one hour to heat water up to the 120 degrees Fahrenheit pre-set


The Camco 11673 will help you to get the most out of a small water heater tank, which means you’ll save lots of money on LPs, such as propane and butane. Though it takes a while to heat up your water, it’s safe for continuous use. You’ll have a constant stream of hot water, ready for use. Better yet, the instructions help you to avoid hours of wasted set-up time, as even amateurs can use them to get the system up and running.

Though it’s much larger than the Camco heater, Eccotemp’s L10 tankless water heater offers 74,500 BTUs, which more than makes up for its size. It comes with a 9-foot hose and gas regulator that carries approval from the Canadian Standards Association (CSA). You can use this heater with a 20-pound grill tank without any issue. All told, it can deliver 2.6 gallons of hot running water per minute, which is more than enough to meet most of your needs.


  • CSA-approved hose and gas regulator
  • Comes with a stainless steel rain cap
  • Features an automatic timer that shuts the heater off after 20 minutes of use
  • Ideal for areas with limited electricity access


  • Larger than the other tankless water heaters on this list
  • Cannot be permanently installed


Eccotemp’s desire to create a safe tankless water heater shines through with the L10. The CSA approval offers you peace of mind, as does the automatic shut-off feature. Though larger than the other heaters here, it’s still very portable and easy to store. The mid-range price also makes it the best tankless water heater for an RV if you don’t want to break the bank when buying a heater.

The most expensive heater on this list is also one of the best tankless water heaters for an RV that you will find anywhere. Coming in at only half the size of a 10-gallon water tank, the PrecisionTemp RV-550 helps you make the most out of your LP supply thanks to its unparalleled efficiency. Built in the United States, this water heater uses VariFlame technology so you keep control over your water’s heat.


  • Uses up to 50% less LP than a standard water tank
  • Comes with a cold weather protection setting
  • Offers over 55,000 BTUs of power
  • A third of the weight of a 10-gallon water tank


  • Less affordable than similar tankless heaters


Though it costs much more than the other heaters on the list, the PrecisionTemp RV-550 boasts the quality needed to justify the price tag. It’s reliable and will offer a constant flow of hot water for as long as you need it to. The PrecisionTemp RV-550 is also the only tankless water heater that works well during all four seasons, so you can take it out on winter trips without any worries.


Reliability is key when looking for the best tankless water heater for RV use. You don’t want to end up with a heater that cuts out constantly when all you want to do is take a shower. You’ll find that these heaters are also portable and can save you plenty of money on your LP use. That makes them great options for any RV owners.