Best Electric Tankless Water Heaters for RVs


Hot water heaters are a bulky part of your RV’s water system. But hot water is essential to enjoying the creature comforts of life that camping with an RV offers like hot showers and clean dishes. An electric tankless water heater is the perfect solution to your traditional energy-hogging hot water tank.

Designed to save space, and requiring no connection to gas, they will give you an eco-friendly, consistent supply of hot water that you’ll be able to use for showering, washing dishes, and anything else you might need hot water for.  The lack of the water tank also means that tankless models don’t add any extra weight to your RV.

When it comes to finding an electric tankless water heater for an RV though, they can be difficult to find since most run on 240V and RV’s have a maximum of 120V electrical systems.

To help make things a little clearer, I’ve put together a collection of the best tankless RV water heaters available, along with a useful buying guide that’s filled with hints and tips on what to look for before making your final decision.

Best Tankless RV Water Heaters

Best Overall
Runner Up
Best Mini Tank
Best Tankless Propane
Best High Flow
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water -...
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4)  - Eliminate Time for Hot Water -...
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Best Overall
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Runner Up
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Best Mini Tank
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water -...
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4)  - Eliminate Time for Hot Water -...
Best Tankless Propane
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Best High Flow
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...

Powered by 110 volts of electricity and measuring just 6.5”x7.5”, the Stiebel Eltron 220816 Tankless Electric Water Heater is perfectly sized for installing in an RV. It provides an instantaneous supply of hot water whenever you need it.

Installation is easy and it can be mounted with the outlets facing either up or down without any impact on its performance. This gives you ultimate flexibility over where you can place it, while it’s sleek and compact design even allows you to install it in plain sight without it looking out of place. 

This water heater also includes a pre-hardwired pigtail for the electrical connection which makes installing it even faster. It also has a built-in high-limit with manual reset option in case of electrical overload.

The quality of this electric tankless water heater is further guaranteed by two included warranties, one of which gives you 7 years of cover for leaks and one that covers the parts for 3 years. 

Pros
  • Small in size
  • Is easy to install
  • Has multiple mounting options
  • Ready to go electrical connections for ease of installation
  • Asthetically pleasing design
  • Has good warrenties against leaks and parts
Cons
  • Doesn’t have any temperature control options
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small

The Chronomite SR-20L Tankless Electric Water Heater is a compact design ideal for under-sink installation, and it can even be mounted in plain sight without being obtrusive. The tankless design of this water heater gives you an on-demand flow of hot water with a temperature range of 90ºF to 120ºF.

It also features patented microprocessor technology that controls the temperature of the water as it flows through the heater and prevents any risk of scalding. This safety feature makes it a particularly good choice for RVs that get a lot of family use and for travelling with children.

Two included chrome compression fittings allow you to easily fix the water heater to your RV’s inlets, and the generated flow rate of 0.5 gallons per minute gives you great water pressure as well. It also comes complete with a 12 month warranty.

Pros
  • Perfectly sized for under sink installation
  • Consistent supply of on-demand hot water
  • Hot water is available within 2 seconds
  • Has a temperature range of 90ºF to 120ºF
  • Built in safety feature that prevents bursts of hot water or scalding
  • Has a flow rate of 0.5 gallons per minute, providing excellent water pressure
Cons
  • Warranty is shorter than other electric tankless water heaters
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
  • Temp Rise At 0.40 GPM: 41 Degrees F
  • Designed for undersink hardwiring, horizontal installation
  • Two mounted chrome compression fittings
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4)  - Eliminate Time for Hot Water -...

While not a true tankless water heater the Bosch Tronic 3000 Electric Mini-Tank Water Heater is a great option for on demand hot water that is super easy to install. It is designed to plug directly into a household outlet and includes a bracket that allows you to securely fix it to a variety of surfaces including walls, shelving, and flooring. 

Simply connect to the cold water line at your sink and you’ll be able to get a constant supply of on-demand hot water. With its 4 gallon tank, this electric water heater is powerful enough to provide hot water for two sinks at the same time.

It’s also incredibly easy to maintain, and has been constructed using a high quality glass-lined material that ensures durability and longevity. This also gives it 98% thermal efficiency which helps to reduce it’s energy consumption and reduces the cost of running it.

It’s built-in temperature controls allow you to find the perfect hot water temperature with ease. It gives you the options of “Minimum”, “Ideal”, and “Maximum” and everywhere in between. There is an extra safety feature in the form of a temperature pressure relief valve.

This water heater is designed to fit under a kitchen cabinet so finding a home for it in your RV should be easy. The Tronic 3000 is backed by a 6 year warranty on the unit and a 2 year warranty on parts.

Pros
  • Easy to install with included bracket
  • Plugs directly into a standard electrical outlet
  • Provides consistent supply of on-demand hot water
  • Durable construction
  • 98% thermal efficiency
  • Simple temperature controls
Cons
  • Temperature controls don’t allow you to pick a specific temperature
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
  • Temp Rise At 0.40 GPM: 41 Degrees F
  • Designed for undersink hardwiring, horizontal installation
  • Two mounted chrome compression fittings
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...

With a compact and lightweight design, the GASLAND Outdoors BS158 Tankless Water Heater is ideal for use in an RV. It uses propane to give you an endless supply of on-demand hot water without taking up any extra energy or space through water storage. 

Installation is super easy thanks to the included hanging bracket, and only two connections to deal with. one connector simply needs to be attached to your RV’s water supply and the other to your propane tank. Insert two ‘D’ size batteries to spark the flame, and it’s ready to go.

Once installed, you’ll also be able to find the perfect water temperature thanks to the easy to use temperature control dials conveniently located on the front of the heater. 

This tankless water heater has several safety features including overheating protection, anti-freezing protection and a flame-failure device, which all work together to ensure that you and your family are able to use it safely. These features also help make sure that the water heater itself is protected, and that it lasts a long time. 

Powered by propane, this water heater has also been cleverly designed with 11.5% energy saving technology, which doesn’t only help to preserve your propane supplies but also allows you to reduce your carbon footprint a little more when you’re on the road.

Pros
  • Easy to install
  • Simple temperature control dials
  • Many safety features
  • 11.5% energy saving technology
Cons
  • Some users have noted that some water dripping around the inlet connector when in use
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
  • 🎁【CSA Approved Safety 】CSA approved Gasland tankless water heater, safe as per Canadian and US Standard. Flame failure device,...
  • 🎁【Lightweight Portable Design】 Compact size and lightweight design for easily carry. It can bring a amazing hot shower for you when...
  • 🎁【On Demand Hot Water】 Maximum power output 41,000btu/hour, get instant endless hot water easily wherever you are. No need to preheat...
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White

The Marey GA10LP Tankless Water Heater provides you with an instant and consistent supply of hot water when you’re travelling in your RV. It is powerful enough to supply up to 3.1 gallons per minute, making it great for family use. 

No electrical connection is required with this water heater either as it’s powered by propane, which allows you to install it wherever works best in your RV without being restricted by an electrical connection. It’s also compact and lightweight, so it won’t take up a massive amount of space. 

Easy to use temperature dials placed on the front of the water heater give you full control over the water temperature and the amount of gas being used, and there is even a seasonal switch that helps to save the amount of energy being consumed at certain times of the year. 

This tankless water heater comes with all of the connectors and hardware you need to install it, and the only thing you’ll need to buy separately are the two ‘D’ size batteries that are required to ignite the spark. Topped off with a generous 5 year warranty, this water heater is perfect for anybody looking for a reliable source of hot water on the go. 

Pros
  • Easy installation
  • Simple temperature control dials
  • Seasonal switch to save energy
  • Includes a 5 year warranty
Cons
  • Doesn’t include as many safety features as some other tankless water heaters 
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
  • Provide endless hot water on demand and only as needed
  • Save up to 60% on electricity bills for water heating
  • Compact design saves space and is easy to install almost anywhere

Tankless Water Heater Buyers’ Guide

Installing a tankless water heater into your RV will provide you and your family with a reliable and consistent supply of hot water that will help take your vacations to the next level.

However, there are a few things you need to consider before you decide which model of water heater you’ll be purchasing. Below, I’ve outlined some points to give some thought to, which will help you find the right choice for your RV the first time around.

Water Flow Rate

The water flow rate that your heater can provide is likely the most important thing to consider. The flow rate is the amount of water that the system can heat in a minute. It is measured in GPM, gallons per minute.

The higher the flow rate the more enjoyable your shower will be and the faster you can fill your sink when doing dishes.

The majority of electric tankless water heaters will still be able to give you a decent flow of water without being too drastically affected by it being used in another part of the RV, but it’s always worth checking how much it can handle before purchasing.

Physical Size

Most tankless water heaters are fair small in size so fitting one into the space your RV’s old hot water tank used to occupy shouldn’t be an issue. But you’ll still want to check the space you have available versus the new water heaters’ physical dimensions. Not to mention any extra room required for connections.

Don’t be put off by smaller models, for what they lack in size they definitely don’t lack in power, and a small water heater will still be able to give you a consistent supply of immediate hot water without needing to take up a large amount of space. 

Although tankless is the main goal here as well, don’t be put off by an electric water heater that uses a mini tank. This will allow you to keep some hot water stored and gives you the opportunity to use more when you need to. 

Installation

As a rule, most tankless water heaters are fairly easy to install due to the lack of the tank and their simplicity, but you’ll still need to make sure that the connections on the model you’re considering are compatible with the water input from your RV.

Some water heaters are also designed not just to be small, but can also offer you a good level of flexibility. This means that they can be installed at different angles and positions which is perfect for irregularly shaped walls or for placing at an angle without affecting the water pressure.

There are also some tankless water heaters available that are powered using propane, and these are a good option to go for if you’d rather not be restricted by an electrical connection when it comes to installation. But you will need to consider how you want to connect it to your propane supply and if it needs to be vented.

Bear in mind that some electric tankless water heaters will need to be installed by a licensed electrician or plumber, otherwise, the warranty becomes void. It’s worth researching this first, and then weighing up the cost of the professional installation against the heater itself and making sure it’s still within your budget.

Heating Elements

Different water heaters use different heating elements to produce hot water, and the material you choose could have an impact on the longevity of your heater itself.

A common material used in tankless water heaters is copper. This is particularly good as it is able to conduct heat very quickly, which results in hot water being produced in a matter of seconds, cutting down on the waiting time for the perfect temperature. However, copper does tend to suffer from oxidation over time, which means you may have to think about replacing parts eventually.

Another material you’ll find in heating systems is stainless steel. This is extremely durable and is designed to last a really long time without rusting or easily corroding.

Some water heaters use infrared technology to heat water, which is usually paired with quartz, and is probably the most durable of all materials used to heat water. It doesn’t corrode and it also reduces limescale and calcium buildup. It’s also recyclable, which adds to its environmentally friendliness. 

Temperature Adjustability

A good range of temperatures is another thing to look for in a water heater, especially if you’re providing hot water for a family where temperature preferences may vary.

Luckily, most electric tankless water heaters are able to generate temperatures that tend to vary somewhere between 86ºF and 140ºF. This gives you ultimate control over the heat of the water being produced and keeps everybody happy.

Eco Friendliness 

By design, tankless water heaters are usually a lot more eco friendly than standard water heaters. They produce hot water on demand, rather than using a lot of energy to heat up a large tank of water and keep it at a consistent temperature. 

Self modulating technology is a good thing to keep an eye out for when considering eco friendliness, as this will ensure your heater is only using as much energy as it needs in order to give you the perfect temperature of water. 

Tankless water heaters that don’t feature a standby button are also a lot more environmentally friendly as they won’t consume any energy when they are not in use.

Safety Features

The safety features your tankless water heater includes are another important factor to pay attention to. These will help protect you, your family, and your vehicle from any accidents.

Any extra safety precautions, such as overheating protection or leakage protection are fantastic safety features that won’t only give you more value for money but will also help to keep you safe while the water heater is in use.

Thermal and pressure relief valves are also a really good feature to look out for, as this will allow you to completely reset the water heater and prevent it from overheating or allowing too much pressure to build up inside the system. 

Warranty

Finally, it’s extremely important to look at the details of the warranty your electric tankless water heater comes with. 

No matter the warranty stated you may find that they are voided if the heater was not installed by a licensed professional. Others will only cover certain parts of the heater, whereas some warranties offer different time spans for the different parts of the heater as well. 

So, make sure that you know all of the intricacies contained within the warranty before purchasing, or else you may find yourself caught short later down the line. 

Best Overall
Runner Up
Best Mini Tank
Best Tankless Propane
Best High Flow
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water -...
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4)  - Eliminate Time for Hot Water -...
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Best Overall
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Stiebel Eltron 220816 3.0 kW, 120V Mini 3-1 Mini Single Handwashing Sink Tankless Electric Water...
Runner Up
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Chronomite SR-20L/120 HTR SR Series Instant Low Flow Tankless Water Heater, small
Best Mini Tank
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water -...
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4)  - Eliminate Time for Hot Water -...
Best Tankless Propane
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Tankless Water Heater, GASLAND Outdoors BS158 1.58GPM 6L Portable Gas Water Heater, Instant Propane...
Best High Flow
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White

Diane Dee

Diane is a lover of all things travel. She and her young family wanted to explore North America from the comfort of their own home so they bought an RV. After fully rehabbing a 1994 Safari Trek, they set out to explore both Canada and the USA.

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