Best RV Tankless Water Heaters of 2020 – Ultimate Review

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Investing in a tankless water heater for your RV has numerous advantages that you can enjoy. Having such a heater is great for those who are quite active.

Are you someone who loves to go hiking, biking, or indulging in similar physical activities with your friends and family? Then an RV tankless water heater is for you!

Here we will be talking about the benefits of owning one of these. We will cover all you should know about such heaters as well as share our top picks.

Comparison Chart of the Best RV Tankless Water Heaters


EZ Tankless Water Heater

  • Best Overall RV Tankless Water Heater.
  • Offers 3.2 gallons of consistently hot water.
  • Prevents accidental burns due to a steady temperature.
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Camplux 10L Gas Tankless Water Heater

  • It is effortless to use.
  • Runner-up RV Tankless Water Heater.
  • It offers you up to 2.6 gallons per minute of water flow.
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Tankless Water Heater

  • It has a low-pressure startup.
  • Best for the Money Tankless Water Heater
  • It will offer you a water flow rate of 1.6 gallons per minute.
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PrecisionTemp RV-550 Tankless Water Heater

  • It has automatic gas modulation.
  • Best Propane Model Tankless Water Heater.
  • Can give you 940 gallons of hot water on 20 pounds of propane.
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Eccotemp FVI12-LP Propane Tankless Water Heater

  • Best 110V Model Tankless Water Heater.
  • It features a digital LED for convenience.
  • It can give you 3.4 gallons per minute of hot water.
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Camplux ME40

  • It offers you 4 gallons of hot water.
  • Best 120V Model Tankless water heater.
  • It offers increased insulation and added durability.
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Girard Tankless Water Heater

  • It is very quiet during operation.
  • Best from Girard tankless water heater.
  • It has an impressive level of freeze protection.
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Rheem Electric Tankless Water Heater

  • It offers 3 Gallons per minute water flow.
  • Installing this water heater is hassle-free.
  • It features an efficient Brass/Copper heat exchanger.
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What Size of Tankless Water Heater Do I Need?

Before you go ahead and buy one of these for your RV, you need to figure out what size you should be opting for. To determine the size you require, you have to determine the temperature rise you will need as well as the flow rate.

Always begin by counting the number of devices you would prefer to run. You will need to add up the flow rates or the gallons per minute (GPM) of each device. Furthermore, determine the temperature of the water source and how hot you would like the heater to make it.

Once you have made these calculations, you should look at the specifications and see the GMP they are able to provide as well as how high they can take the water temperature.

How Does a Tankless Water Heater Work?

A tankless water heater works by directly heating the water without there being a need for a storage tank. This means that when you turn on a hot water tap, the cold water will move through the pipe and into the heater. Depending on the type of the heater (electric or gas powered), the device will begin to raise the water's temperature, and you will be able to enjoy a continuous supply of hot water.

There is no need for a tank to be filled and then be heated when you are using a tankless water heater. You can also go ahead and install several tankless water heaters depending on the demands you have.

How to Choose a Tankless Water Heater

Choosing the right model for your RV can be a chore if you don’t know what to look for. You don’t want to waste your money on buying a water heater that isn’t able to meet your requirements for hot water, right?

To make things easier for you, we have shared certain specifications you should keep an eye on when shopping.

Gallons per Minute

The model you purchase should be able to deliver the Gallons per Minute or the GPM you require. A higher GMP means you will be able to use more devices simultaneously, especially those which need a higher GMP such as high-powered showerheads.

Source of Power

You will need to see whether you prefer an electric tankless water heater or a gas water heater. Both can heat water. However, it all comes down to what you are comfortable with.

Ease of Use

The model you buy should be easy to use for you. No one wants to waste time trying to figure out how to properly use the dials and the knobs to select the temperature you prefer.

Safe to Use

You should opt for tankless water heaters from reliable brands. By doing so, you will be buying a unit which is safe to use and will prevent any heating accidents down the line.

Quick Take - The Best RV Tankless Water Heaters

Before you go any further, here are the RV tankless water heaters: 

  1. EZ Tankless Water Heater
  2. Camplux 10L ​
  3. Tankless Water Heater

Review of the RV Tankless Water Heaters

After knowing a lot more about RV Tankless water heaters, you must be interested in learning about the best options you can buy. Well, we are going to make it much easier for you.

Portable Propane Tankless Water Heater - EZ 202 - EZ Tankless - Battery Powered Ignition - Camping RV


  • Easy to install.
  • Safe to use.
  • Exceptionally user-friendly.
  • Shuts down automatically after 20 minutes.


  • Some people might experience this device powering down every 15 minutes.

We are going to begin our list with the EZ Tankless Water Heater. This item is our best overall selection from all the models we went through. If you are looking for a reliable option, this device is it.

The EZ 202 gains its energy to effectively heat up water, from a propane tank. It features a knob which you can use to set it as you prefer. There are the Winter or Summer options. You can also adjust the flame level as well as the water flow. This model makes use of 2D batteries for ignition. Furthermore, it also has a digital display to let you know about the water temperature.

When you buy this item, it is accompanied with a shower head and a hose. These attachments are portable too. As for the design, it makes use of the best specifications to make usage easier. The knobs and the slots on this item are set to offer convenience. It is easy to set up and get the hot water you want. This unit can offer you 3.2 gallons of consistently hot water. Also, accidental burns are prevented due to the steady temperature.

This model will also automatically power-down after every 20 minutes. Such a feature allows it to save on energy consumption.

Bottom Line

The EZ Tankless Water Heater is our best overall choice because of how powerful and easy to use it is for your RV. Simply use the knobs to set it the way you want and enjoy some hot showers.

Camplux 10L Outdoor 2.64 GPM Digital Display Portable Propane Gas Tankless Water Heater


  • Very efficient design.
  • Anti-freezing and overheating protection.
  • Offers you a consistently heated flow of water.
  • Dials are easy to use and set how you want.


  • Instructions aren’t well-detailed.

For our runner-up, we have the Camplux 10L Gas Tankless Water Heater. If you are someone who wants to buy a dependable and durable model that is perfect for your RV, this device should be one to consider. It is perfect for use on your next camping trip or when you decide to go hiking or cycling with your friends, family, or even by yourself.

This model makes use of gas to power itself and thus offers you more portability. All you need to do to operate this is hang it up. After that, you can attach the propane tank and then finally start the ignition. 

To ignite, you can use the 2 DD batteries, or you can use an electric socket. The dials on this heater can be used to adjust the temperature as well as the water flow. This portable unit can offer you a capacity of 2.6 gallons per minute of water flow.

This device also has a show hose. However, you can opt for the traditional hose if that is what you prefer. You can use the hose to connect this to any water source. The design also makes sure it doesn’t take up too much space. This tank has anti-freezing as well as overheating protection for your safety.

Bottom Line

The Camplux 10L is our runner-up due to how easy it is for you to use. Simply turn the dials to ensure you get the water flow and temperature you prefer.

Best for the Money:
Excel Tankless Water Heater



  • Overall construction is durable.
  • Features a magnetic water flow sensor.
  • Will work even if the water pressure low.
  • Using this outdoors and indoors is extremely straightforward.


  • Certain safety hazards can result from mindless errors if attention is not placed on installation.

Next, we are going to talk about the Excel Tankless Water Heater. Excel is a well-known brand. So, selecting this device means you are buying something reliable. Furthermore, this model from Excel is also our top budget choice. This device offers you a low-pressure startup. It only requires as little as 2 PSI to begin working.

This heater offers you a water flow rate of 1.6 gallons per minute, which is quite impressive for a motorhome (or an RV). Its vent-free technology allows you to easily install this heater indoors, if that is what you prefer. Due to it not having a lot of parts for you to handle, the installation process is quite hassle-free.

You should take note that this also has a magnetic water flow sensor. It is because of such innovative technology that this heater can function effectively even when there is low water pressure. So, if you are in an area without an abundant water supply, you can still use this.

Bottom Line

This unit from Excel is an excellent option to know about if you ever find yourself in an area which doesn't have high water pressure. The innovative technology makes it convenient to use indoors as well as outdoors. However, do make sure installation is done correctly to prevent safety concerns.

Best Propane Model:
PrecisionTemp RV-550

PrecisionTemp RV-550 Tankless Water Heater - Wall Vented


  • Easy to use.
  • Very light in weight.
  • Simple to install.
  • Helps save on energy consumption costs.


  • This product has a larger price tag compared to other tankless units.

If you are looking for a propane-fueled tankless water heater for your RV, we have the PrecisionTemp RV-550. This unit is not only perfect for your RV, but it will do its job effectively even when used in a tiny house, a cabin, or a trailer.

Buying this unit means you are opting for a model that has been designed, assembled, and checked in the USA. This is another reliable offering because it has been constructed to not only give you hot water but to also save on energy costs.

This unit won’t operate unless you turn the hot water tap. Furthermore, it will only use half of the propane other similar models require. This device will give you, on an average, approximately 940-gallons of hot water with 20 pounds of propane. Also, due to only weighing 32 pounds, it is considerably lighter than other similar models out there.

The temperature can remain consistent due to the automatic gas modulation. This model will self-regulate to ensure you get the level of hot water you deserve. It also has freeze protection, which means it can continue to operate effectively throughout the year. As long as there is an adequate flow of water, this unit will provide you with hot water.

Bottom Line

Even though the price might be an issue for some, the PrecisionTemp RV-550 is still the best propane model. You can easily use it in your RV for the hot water you want.

Best 110V Model:
 Eccotemp FVI12-LP

Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters, White


  • Installation process is easy.
  • Displays the temperature of the water.
  • Appealing, space-efficient design.


  • Some users might not like the trial-and-error method with the knobs to set the desired temperature.

Now we are going to talk about the Eccotemp FVI12-LP Propane Tankless Water Heater, which is our best 110V model option, and for a good reason. This is a water heater which makes use of liquid propane and can easily provide you with a continuous flow of hot water at 3.4 gallons per minute. Such a flow means two showers can be used simultaneously. The design features a digital LED which displays the water temperature as well as any error messages that might occur.

Take note that this unit can't automatically maintain the temperature of the water. You will need to set this device depending on what you prefer manually. The control panel has two regulator knobs. One of the knobs controls the water flow while the other controls the flow of gas. Both knobs have to be used to set the temperature at the perfect point.

This also requires a water pressure of over 30 PSI to activate. That is why it won't do you any good if used in areas with low water pressure. As for the installation, you can quickly hook up this unit and start enjoying the hot water you want.

Bottom Line

Even though the Eccotemp FVI12-LP isn't the best option for areas with low water pressure, it is still an impressive 110V water tank. Using it is very easy. The 3.4 gallons per minute of water flow means more than one person can enjoy hot water simultaneously.

Best 120V Model:
Camplux ME40

Camplux ME40 Mini Tank Electric Water Heater 4-Gallon,120 Volts


  • Easy to use.
  • Features freeze protection.
  • Safe to use for an RV and durable as well.
  • Easy to install in small spaces.


  • Won’t give you more than 3 minutes of a hot shower if you use a high-flow shower head.

Now onto the best 120V model, the Camplux ME40. Yes, this is another Camplux unit on our review list. When you are outdoors, you need a good source of hot water if you wish to enjoy your time and relax.

The Camplux ME40 electric water heater gives you just that. Through this unit, you can enjoy up to 4 gallons of hot water whenever you need it. You can easily use it for an RV, a cabin, or a tiny house.

The design features great insulation and durability. This unit's fast recovery rate means you won't have to wait very long for hot water. It has an external dial which you can use to control the temperature of the hot water you want. You also don't have to worry about heater-related accidents either. This model has the CSA listed temperature-and-pressure relief valve to ensure your protection during use.

The adjustable thermostat featured in this device means that once you set the temperature that you want, this unit will automatically control the water temperature. It has a red indicator lamp which will remain illuminated while this device is heating the water.

Bottom Line

The Camplux ME40 is a mini water heater that packs a lot of power in a small design. By giving you 4 gallons of hot water, you can use it to make your life comfortable in an RV.

Girard 2GWHAM On-Demand Tankless Water Heater


  • One of the quietest water heaters available.
  • Monitor lets you know about the temperature.
  • Offers enough hot water for a long shower.


  • Requires higher water flow to work.

Girard is another reliable brand you should be aware of. The Girard Tankless Water Heater, more specifically, the Girard 2GWHAM, is our selection for the best from Girard.

One of the most impressive features about this is how quietly it operates. Now, even though it does come across as bulkier than other similar models, it is very effective with regards to giving you the hot water you need in your RV.

This unit will remain safe during the cold winter months because it is freeze protected. You will be able to enjoy hot water during winter without having to worry about this not being able to work correctly. It features a burner, which you can adjust to set the temperature to what you prefer. There is a microprocessor monitor, which will let you monitor the temperature.

With the Girard 2GWHAM, you won't have to wait long to experience the hot shower you want. You can even use hot water for cooking and washing.

Bottom Line

The Girard Tankless Water Heater is great for those who prefer quieter devices. You can easily install it in your RV or small cabin to enjoy the hot water you deserve during colder months of the year. However, do note that it does require higher water flow to work effectively.

Rheem RTE 9 Electric Tankless Water Heater, 3 GPM


  • Doesn’t take up much space.
  • Very easy to use.
  • Can be easily installed under the sink or any other small space.
  • Gives you instant hot water the moment you turn on the faucet.


  • Some users have doubted this unit’s ability to give a 3 GPM flow rate.

For our top pick in the electrical category of RV tankless water heaters, we have the Rheem Electric Tankless Water Heater, more specifically the Rheem RTE 9. Rheem is a very well-known company, and this model lives up to the standards one excepts from this brand.

This device is perfect for providing you with a continuous hot or warm water supply whenever you need it. When cold water enters the system, the hot faucet begins warming the cold water. This model uses electricity to heat water in an instant. That is why the minute you turn on the tap, you will get hot water flowing towards you. There is no hassle during the installation process and the compact design keeps it from taking up too much space.

The controls are easy to understand and you can set the temperature settings as you prefer. The system has a thermometer that lets you know how hot the water has become.

Furthermore, this unit has a standby mode. The LEDs will let you know when the unit is active or is on standby. The copper and brass heat exchange in this unit has a warranty of 10-years. This water heater can give you 3 gallons per minute of hot water flow.

Bottom Line

This impressive electric tankless water heater from Rheem is easy to use. It is highly portable and perfect for those who prefer to not to use a gas power source to operate a water heater.

Perks of Investing in a Quality Tankless Water Heater

Investing in a high-quality tankless water heater for your RV is going to change your life for the better in more than one way.

Hot Showers

The biggest perk of investing in a water heater is you will get to enjoy hot showers whenever you want.

No More Waiting

A good option will do away with the need for you to wait a long time for the water to heat up to the temperature you want.

EZ Tankless Water Heater

Saving Space

A high quality unit won’t take up too much space. This makes such heaters perfect to be used in RVs or other small living areas.


Having hot water on demand increases overall comfort in your life, especially during the cold winter months. You will be able to wash your face with warm water. You will be able to wash dishes with hot water without having to tolerate cold water running through the pipes in winter.

Types of RV Tankless Water Heaters

The available types depend on the kind of power such heaters use. When searching for the best model, the different types you will come across are:

Propane Water Heaters

This is regarded as the most common type. As the name suggests, these units use propane as a power source for heating water. They are considered to be faster than electric heaters. Furthermore, they are easier to maintain.

Electric Water Heaters

The electric water heater is the cheaper selection out there and they are also easier to use than a gas models. They don’t make a lot of noise and can be quickly installed.

Combination Type Water Heaters

It is always good to have options when it comes these units. A combination type means you can choose whether you wish to use gas or electricity to operate a heater for the hot water you want.

How to Install a Tankless Water Heater in an RV

When installing a tankless water heater in an RV, it is crucial that you refer to the manual. Depending on the model as well as the source of power (gas or electric), the installation process is going to be different.

However, there are specific vital steps you should follow before installation.

  1. Always make sure the water supply is off.
  2. Also, make sure the gas supply is off.
  3. Ensure the DC electrical connection is turned off in the RV from the main power supply.
  4. Carefully detach any model previously already installed in the RV.
  5. Clean the space. You can use a cleaning spirit for this job.
  6. Install the new unit.
  7. Make sure it fits perfectly.

Certain models can be installed outside while some can be installed inside the RV. It all depends on the type of model you are comfortable using. Again, always make sure to refer to the manual for safety reasons. Also, remember to test it after installation to see if you did it correctly.


We hope this article proves to be a valuable resource for you as you investigate the different varieties of water heaters available and determine which unit you should consider buying for your RV.

People Also Ask

In this section, we have answered some common questions people tend to have about tankless water heaters.

How to Keep a Tankless Water Heater From Freezing

There's more than one way for you to keep a tankless water heater from freezing.

  • Installing your heater in a warm place is generally advisable.
  • Draining your water heater can prevent standing water from freezing up.
  • Having the heater connected to electricity can ensure the unit’s freeze protection feature continues to work.
  • Having insulated piping can also help ward off frozen pipes.
  • Running a trickle of hot water throughout the night can also prevent freezing.

How Many Amps Does a Tankless Water Heater Use?

The number of amps a model will use to heat the water to the temperature you want depends on the model you are using. On average, an electric unit will need 120 amps to operate. While electric water tanks can help you save money on energy consumption in the long run, you need to make sure your RV’s total electrical capacity is able to provide the heater you are interested in with the amps it needs.

How to Vent a Tankless Water Heater

Tankless water heaters are commonly vented in two ways. There is the direct vent and the power vent. The direct-vent heaters will pull the air in from the outside. They have two vents. One is for intake, and the other serves as the exhaust.

Power vent units only need an exhaust vent. That is also why it must be installed in a larger area which has enough air for combustion.

Outside units are built to resist below-freezing temperatures and don’t require additional venting.

You can have a tankless water heater vent through a side wall or the roof. The more traditional gas units will need to be vented through the roof.

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