Best RV tankless water heater

Last Updated: 24.07.19


What are the best RV tankless water heaters?


If you’re an avid outdoorsman and you’re used to traveling around in your RV then you probably are in need for something to heat up your water for showering on chilly days. So if you are looking for the best RV water heater, you’ll find that this short paragraph is sufficient in providing results. After we gathered information and we’ve looked through reviews, we came to the conclusion that the gas Flex 10011 is the best RV tankless water heater because it needs little water pressure to start, 2 PSI would suffice, unlike other water heaters that require at least 30 PSI. It is capable of delivering hot water instantly as you open the hot water tap, thus allowing you to save energy and water. Its beautiful design will prove to be a nice addition to your RV, making it a place that feels closer to home. In case this product is unavailable, we suggest that you look into the Eccotemp L10.



Comparison Table


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A short buying guide


We know that it is a time-consuming job to wander across the internet to find the right product. It is easy to get lost among the complicated features and characteristics, but if you’d like to find the best tankless hot water heater for RV for sale, then we invite you to give our informative guide a chance. We’ve also come up with some suggestions so that you’ll be able to find what you need in no time.



When you decide on purchasing a tankless water heater, you don’t need to concern yourself with the matter of capacity because it doesn’t come with a storage facility for water intake. Instead, you should look at how it allows the water to flow. When it comes to households, you’ll need something that is capable of generating enough heat.

For example, if your washing machine and your shower are working at the same time and your heater isn’t powerful enough it will result in lukewarm water. Instead of buying two items, which will be more expensive, look into a more powerful one.

For RVs, you should consider why you’ll need it for. Showering and dishes shouldn’t require much so you might not have to dig too deep into your pockets.




Here the choice is somewhat simpler. You can buy either gas-powered heaters or electric ones. The advantage of the water heaters that work on gas is that they are faster and more efficient. They run on either propane or kerosene, and they require venting, so take this into consideration.

You can find some products that can be installed directly outside to prevent you from having to figure out how to ensure enough ventilation. For increased efficiency, you can look for electronic ignition products as they don’t require fuel to maintain a flame.




Unlike models that store water, with this type of product you won’t have to concern yourself with its capacity, as we already said. The only concern should be if it is capable of heating up enough water in order to serve multiple tasks.

Look for the BTU (British Thermal Unit) input and the efficiency ratings because they determine its flow rate which is expressed in GPM (gallons per minute). So, the higher the BTU’s rating, the higher the water’s flow rate. If you tend to take your RV in cold places, then know that it might take longer for the water heater to do its job since the water is colder there.



Our top picks



gasFlex 10011 


Unlike other models which require up to 30 PSI of water pressure in order to start up due to outdated technology, this product works with only 2 PSI. If you are looking for a tankless water heater which is ideally made to fit into RVs, campers, rural cabins or small apartments as well as all kinds of boats and mobile homes, then you might want to take a good look at this product.

It is capable of saving water and energy thanks to its capacity of instantly delivering hot water after you’ve activated the tap. Since it is a vent-free appliance this model won’t require that you install costly flues or ductwork and that’s because it comes with state of the art oxygen depletion safety.

This unit is outfitted with a magnetic water flow sensor which will allow it to work even at low water pressure and this means that it’s ideal for use during RV trips.


Buy from for ($299)




Eccotemp L10


If you are looking for a portable tankless water heater that is tiny enough to let you enjoy different outdoor activities while providing good performance, then we suggest the L10. It is able to fit almost anywhere, from RVs to an artist’s studio and can even be used to wash animals at your farm.

You won’t have to worry about getting a specialist in order to install it because you’ll see that the process at attaching it to your RV and making it work isn’t as troublesome as you’d think. It is able to provide 2.6 GPM of water flow making it ideal for small-scale application, meaning that it is great for your RV.

Another perk you might love is that this product is affordable, yet it is capable of providing hot water when you want it. Its rain cap is made from stainless steel in order to protect its interior heating parts, so don’t worry that it will rust.


Buy from for ($259.99)




Eccotemp L5


If you wish to gain a tankless water heater that is capable of performing great in meeting low requirements, then the L5 might be designed for you. It is capable of delivering up to 1.4 GPM of hot water, meaning that this product should be more than enough in order to satisfy your hot water needs while going outdoors.

Since it runs on propane gas, it should heat water quicker and in a more efficient way while using less energy when you compare it with electric models. This tankless water heater will enable you to adjust how hot your water gets, allowing you to adjust the temperature between 80 and 150 degrees Fahrenheit.

It requires 20 PSI of water pressure in order to work, any lower and it will stop heating. The maximum amount of PSI it is capable of enduring is 80. A 20-pound propane tank should be enough to run it for 18 hours.


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