6 Best Electric tankless water heater for RV

RV travelers claim to have hot water on demand, but it cannot always be delivered by a conventional propane/electric RV water heater. Especially if you have multiple people or a hot shower is needed by one person, the other washes dishes.

An RV tankless water heater solves this problem by supplying copious quantities of immediate and limitless hot water in your or RV on call. All RV hot water heaters, of course, are not the same. There are various types of fuel, flow rates, and other unique characteristics that can affect tankless water heater best for your RV. So, it’s not easy to choose a perfect Instant RV water heater, mostly if you haven’t done so before. Well, don’t be afraid. For you, I did all the hard work.

We’ll take a look at some of the best tankless water heaters for RVs, campers, and travel trailers in this RV water heater purchase guide. This will include the source of heat and the functionality you need, as well as knowing the flow rate you need to ensure that your RV still has hot water on demand.

Benefits of RV Tankless Water Heater

  • Hot Water on Demand

The RV Tankless Water Heater offers hot showers on request. Whenever you need it for showers, washing dishes, etc., the best tankless water heater can provide hot water. Without a holding tank, you can also access a constant supply of H2O.

  • Energy Efficient

Heaters for RV Tankless Water are energy-efficient. A tankless hot water heater for RV use has more energy efficient than a conventional storage tank heater. That’s because heat from standing water is less likely to be lost.

  • No pilot Light

There are plenty of DSI or direct spark ignition water heaters out there now to give RV owners peace of mind. However, electrical ignition is used by the latest generation of tankless water heaters, so no pilot light is needed at all.

  • Efficient Distribution of Water

RV Tankless Water Heaters more easily disperse water. If your family wants to take several showers in your camper while you do the dishes or wash laundry, it’s not a concern. These units allow you to perform several functions simultaneously and, on-demand, continue to produce hot water.

  • Accuracy

You can set the temperature of your water to whatever you want. If you think you’re most comfortable temperature is 105 ° F, you can have it in seconds at the fixture at that exact temperature.

  • Durability

RV Tankless Water heaters are very durable. Tankless water heaters last between 10 and 15 years on average, while conventional water heaters will only last between six and 10 years. It is possible to last up to 20 years for certain tankless brands if they are maintained correctly.

  • Conserve Water

RV Tankless Water Heaters conserves water. By letting it go down the drain in the tub when you’re waiting for the hot water to come out, you no longer have to wastewater. Compared to conventional tank heaters, a tankless unit heat the water rapidly, taking two to three minutes or more to remove hot water.

  • Long-Lasting

For a typical tankless water heater, the mean lifetime is over 15 years. When not in operation for extended periods, tank systems will eventually rust. This is not a concern for tankless people because they don’t have water storage.

  • Cost-Effective

RV Tankless Water heaters are cost-effective: For RV showers and appliances, a tankless water heater heats water more effectively than conventional ones, thus consuming less energy. It will save you many dollars per month, a result.

Let’s start by looking at our top 6 choices for the best tankless gas or electric water heater for your RV or camper before going into an in-depth analysis.

Comparison Table of Rv Tankless Water Heater

Image Name Prize Specs Price
61UO7NZtIL._AC_SL1498_ Bosch Electric Mini-Tank Water Heater Best For Small RVs Flow rate: 3.5 GPM
installation place: indoor , outdoor

Check Price
pr2-1 EcoSmart Eco 11 High quality & budget friendly Flow Rate: .25 GPM
Installation: small and mid houses.

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pr3-1 Eccotemp FVI12-LP Liquid Propane Best Portable  Flow Rate: min 0.65 GPM
installation: cabins and smaller homes
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pr4_ Suburban 5239A RV Tankless Water Heater Best Propane Flow Rate: 3.5 GPM
House Size:
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pr5-1 Camplux 10L Outdoor Most Quietest Flow Rate: 2.64 GPM
Installation: indoor installation only
Check Price
6-1 Rinnai RU80EN 8.0 GPM Tankless Water Heater For RV Best Natural Gas Flow Rate: 8.0 GPM
House Size: small to large.
Check Price

1. Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4)

It is a very convenient hot water heater with a 4-gallon point-of-use mini-tank that fits under your sink to provide hot water right where you need it. This unit has a thermal efficiency of 98%. This electric water heater is easy to maintain. It has premium glass-lined material for long life.

This unit eliminates long waits for hot water at your sink, get on-demand hot water at your every need (supplies up to 2 sinks at a time).

Bosch Electric Mini-Tank Water Heater

Key Features:

  • 4-gallon capacity
  • Provides hot water quickly at point-of-use
  • Units can be wall/floor mounted
  • Temperature/pressure relief valve
  • Glass-lined tank for long service life
  • 120VAC plug-in connection (1440 Watts)
  • Temperature Control

For a long service life, this electric water heater is simple to maintain and has premium glass-lined material. This unit removes long waits at your sink for hot water, getting hot water on demand at your every need (supplies up to 2 sinks at a time).


4-gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. 


This electric water heater is easy to maintain and has premium glass-lined material for long service life. (Amps 12A, Volts (VAC) 120)


36-37″ cord plugs into a 120-volt outlet for independent installation or in-line with a large hot water source


Eliminates long waits for hot water at your sink, get on-demand hot water at your every need (supplies up to 2 sinks at a time)

  •  Easy to Install

Simply tap into the cold water line, mount the water heater near the sink and provide an electrical connection. This heater is Used alone to supply a limited water volume or mounted in-line near the point of use with a central water heater to reduce the wait for hot water. T2wswdhe ES2.5 and ES4 models have a plug-in link of 120 VAC.

  • Convenient hot water heater
  • Long-lasting quality
  • Fast recovery rate
  • Easily mounted
  • Independent installation:
  • Warranty only if a unit is installed by professionals, which is very expensive

2. EcoSmart Eco 11

EcoSmart ECO 11 is a 13-kilowatt tankless electric water heater suitable for a toilet, small sink, office break room, and other low-flow or point-of-use applications to provide hot water. Depending on the temperature of the inlet water, it may provide between 1.3 and 3.1 gallons-per-minute. Please refer to the sizing guide to select the right solution for your hot water needs. With EcoSmart, you would be happier to know that the hot water you expect is available endlessly, regularly, and on-demand so that your water and energy waste can be reduced. It feels warm all over now with EcoSmart.
The Eco 11 is an electric water heating unit, which ensures that, unlike gas units, it needs no burners or flames. And, as a ventilation system is not necessary, the installation is also effortless and inexpensive.

EcoSmart Eco 11

Key Features:

  • Endless hot water
  • Save up to 50% in water heating costs according to the Department of Energy
  • Compact design, more storage space
  • Digital temperature control 80 – 140° F
  • Field replaceable elements
  • Advanced self-modulating technology

Moreover, thanks to its compact size, you can put Eco 11 within your home almost anywhere. The structure of point-of-use and heating on demand cuts down while waiting for hot water, saving time.

EcoSmart tankless heaters only turn on when hot water is required – plus, they reduce heat loss, saving you up to 50 percent of the DOE’s water heating expense. For small to mid-sized homes and even mild climates with incoming water temperatures above 67 °F, this EcoSmart water heater is the ideal option. For commercial enterprises, large houses with more than three bathrooms, and cold weather conditions, the Eco 11 tankless water heater is not perfect.

It is one of the best tankless water heaters of all; You’ll never run out of hot water with an ECOSMART tankless water heater.

  • Save space

A lot of space is taken up by traditional tank heaters, but the sleek, wall-mounted nature of EcoSmart frees up floor space for more storage and is 90% smaller than a tank.

  • Saves Energy

The most advanced self-modulating technology is featured in EcoSmart, utilizing just the amount of energy required to heat water when you need it.

Is EcoSmart Eco 11 reliable for large homes?

Since its flow rate is 2.3 gallons per minute, the EcoSmart Eco 11 is more powerful and ideal for smaller homes and apartments. Another choice is to use multiple EcoSmart Eco 11 heaters in a larger home if you need more water or have a larger home.

  • Energy Efficient Water Heater

You can save hundreds of dollars a year by using a water heater without a tank. This water heater will save up to 60 percent on energy bills, according to the manufacturer. The EcoSmart Eco 11 is a water heater that is very energy efficient because it switches on whenever necessary and does not have a standby time. Whenever the pipe goes off, the heater goes off to conserve fuel.

  • Energy efficient
  • High GPM for an electronic model
  • Easy to install
  • Its technology controls the unit’s energy output for optimal performance.
  • All of the components are made out of copper or stainless steel for durability.
  • Warranty requires professional installation

3. Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heater

The extremely powerful Tankless Water Heater Eccotemp FVI12-LP uses an intense propane flame to heat water instantly when it passes through the heater exchanger. So as long as you feed in the water, hot water is going to come out! With the Horizontal Vent Package included, this Eccotemp FVI12-LP Tankless Water Heater is ready to be mounted right out of the box for indoor use.

Eccotemp FVI12-LP Li

Key Features:

  • This unit activates only when in use, making it an energy saver.
  • Safe electronic ignition system
  • plugs into standard 120v electrical outlet with UL-listed cord.
  • Uses standard 1/2″ NPT water fittings 
  • Manual water temperature controls
  • Minimum 0.65 GPM flow rate
  • Frustration-Free Packaging

Hence this water heater is great for cabins and smaller homes. It can be used with a propane tank of 20 to 100-pounds (lb) (tank and hoses not included). A manual heater for water is the EccotempFVI12-LP Tankless Water Heater. It implies that any changes to the water temperature must be made on the device’s face using the water flow and gas pressure knobs. It is not recommended to mix the cold water at your production source.

Plus Features

  • Digital thermostat and temperature display
  • Manual water-temperature controls
  • Stainless steel horizontal vent kit included
  • Uses gas only when hot water is activated
  • 30-80 psi water pressure
  • Efficient power ventilation
  • Perfect for any small home
  • Easy to read digital temperature display
  • Minimal noise output.
  • Compact Size
  • Some users experienced inconsistent performance

4. Suburban 5239A RV Tankless Water Heater

Suburban’s range of water heaters, the best water heaters on the road today, includes high recovery gas, gas-electric, and motor help models with sizes and features to suit almost any RV requirements. Heated water, but not porcelain, attacks all metals. That is why Suburban uses a steel water heater tank lined with porcelain with a node rod to “absorb” the electrolytic action – much like your home water heater. In reality, tank life will double or triple its three-year limited warranty when a Suburban porcelain-lined tank is properly maintained, saving owners the expense of premature replacement.

Suburban 5239A RV

Key Features:

  • 6-gallon water tank
  • 12,000 BTU rating
  • Weight: 32.9 lbs
  • D- 12 Volt DC Direct Spark Ignition Gas Heating System

This unique RV tankless water heater is designed to run on propane and has a rating of up to 12,000 BTUs per hour for the burner portion.

It was also engineered to recover quickly. For immediate usage, water is heated and stored in a 6-gallon tank. However, this model can generate up to 10.2 gallons in a single hour of hot water.

  • Porcelain Coating protect it from corrosion
  • Convenient Exterior Gas Line Connection
  • Copolymer Insulation Jacket Specially Fitted To The Tank To Retain Heat
  • Fast Recovery
  • Tank space is not enough

5. Camplux 10L Outdoor

For campsites, cabins, or only around the home, the 2.64 GPM Camplux portable tankless water heater is sufficient. Wash the car, wash the boat, take a hot shower, wash the horse or the dog. There are 2 D cell batteries in the ignition, so it makes it perfect for the off-grid. 2.8 110.0 PSI is the optimal operating range for the 2.64 GPM Camplux portable tankless water heater. The Camplux water heater focuses on revolutionary combustion technology and advanced multiple protection systems to ensure your safety.

Camplux 10L Outdoor

Key Features:

  • Eco/Full switch function saving energy
  • Dry combustion protection
  • Flame failure device
  • anti-freezing protection
  • The gas inlet connector 5/8″ UNF inverted flare male
  • For indoor installation
  • CSA approved gas regulator and adapters

The Complex BW264 is suitable for hiking, mountain cabins, horse stables, etc., for beach or family vacations. If a flue pipe is still built indoors, it can also be placed where it is well ventilated. The machine also fits well with a 12-volt water pump for updated water systems. With a maximum power output of 68,000btu/hour, the operating propane gas pressure is 0.4PSI.

  • Easy to Use

This unit provides indoor usage for entire homes on-demand with clean, sufficient power ventilation, suitable for small families, cabins, or apartments.

  • Modern Design

It is easier to read the temperature with the unique color optical temperature monitor. This unit has compact and space-saving design characteristics with low noise output.

  • Save more energy:

Eco and Full gas switch, rated at 2.64 GPM, only activates while in operation, thus saving more electricity.

  • Ideal for camping, beach, or family vacations, mountain cabins, horse stables, etc.
  • Compact and lightweight
  • Digital temperature control
  • Portable tankless water heater
  • Reasonable price
  • Best propane tankless water heater
  • Easy to use
  • More secure
  • It can’t use for drinking water
  • Gas water heater can’t use for drinking water

6. Rinnai RU80EN 8.0 GPM Tankless Water Heater For RV amazon

To run on natural gas, the Rinnai RU80EN 8.0 RV tankless water heater was developed. Keep in mind that natural gas accounts for approximately one-third of propane’s energy density and is thus not available in a conventional storage tank at the customer level. This implies that you would need a secure natural gas source at an RV park, such as a plumbed natural gas pipe.

Rinnai RU80EN 8.0 GPM

Key Features:

  • Not fabric
  • Imported
  • Condensing Technology for Greater Efficiency and Significant Energy Savings
  • Up to 97-Percent Thermal Efficiency
  • Pre-set at 120-DegreeF
  • Natural Gas and Propane Models Available
  • Meets California and Texas NOx Emissions Standards

It uses a unique “Condensing Technology” that makes the most of natural gas’s already energy-efficient existence. The net result is that it has a thermal efficiency of up to 97 percent, far outpacing propane for superior energy savings. It also follows the standards set by the state of California as well as Texas for emissions.

Is it Energy-Efficient?

Natural gas seems to be the way of the future, and with the Rinnai RU80EN 8.0.0, you can save a lot of money if you have access to it in a seasonal or long-term rental RV park.

  • Energy Efficient
  • 8 GPM flow rate
  • Up to 97-Percent Thermal Efficiency
  • Portable tankless water heater
  • Available in four models
  • Suitable for mid-to-large-sized home
  • Condensation causes loose much of its energy efficiency

Buying Guide-Feature to Consider while buying Rv tankless Water Heater

There are a few things that you may want to take into account. Depending on your camping accommodation and preferences, each option can be crucial, which is why you might want to make a measured purchase. These will control how your RV water heater is used, maintained, and enjoyed.

  • Size

It’s not just about the tank’s capacity, but the product’s dimensions. Since the new heater was slightly too wide to fit in the pre-existing slot where the old heater was, there are plenty of stories online about transactions gone wrong. Pay extra careful attention.

  • Heat-Up time

It depends in part on your volume and the type of heating that you are using. Heat-up times, on average, will take from 10 to 20 minutes for a six-gallon tank. Some heaters have adapters, gas regulators, and heat exchangers that can help you with the time and level of heat-up. Nevertheless, you can prepare accordingly, because when you need it most, you may not have on-demand water.

  • Water Usage

You should have an average idea of how much water you expect to drink before buying tankless water heaters. As it does not use hot water, this may or may not include your toilet (unless you opt for a heated bathroom; if you do, it means you’re too relaxed for camping). These are also the units that generally use hot water.

Think about how many of these gadgets you have when you pick your RV water heater and how much you intend on using them. However, with tankless water heaters, “how many of these appliances do you plan to use simultaneously?” would be the more relevant question. Water from a reservoir does not rely on tankless water heaters, but they have a fixed amount of water to heat up every minute.

  • Location

The fact that you no longer have to waste storage space is one of the advantages of buying tankless water heaters for RVs.You can use space to put whatever else you want in your RV. However, if you end up camping in the middle of the woods somewhere, with no water connections, then the water heater is almost useless.

If your RV has a source of water of its own, then this makes it simpler. You should usually mount the water heater outside the RV, but, depending on its size, you can also install it in the RV. Again, you can go for anti-freezing kits that can be added to the heater if you are worried that the cold temperatures will freeze your device.

  • Gas or Electric

You will want to choose between a gas and an electric water heater, depending on where you plan to go camping or the facilities that your RV already has. Your campsite will decide if gas is the most cost-friendly alternative or if you should go for electricity.

Tankless water heaters usually are less costly than electric ones for gas-powered RVs, and they come with a higher flow rate. Plus, you won’t need to hook them up to a battery or power source, provided that they operate on coal, not electricity.

  • BTU Capacity

BTU stands for British Thermal Power, which relates to the heating capacity of the unit. You may want to give this some serious thought, depending on the region you plan to travel to; for example, if you go to a location where the water usually is freezing, the heater would not fully heat the water. You can end up with lukewarm water as a result.

A product that hovers every hour between 30,000 and 50,000 BTU may not fit the heat you’re getting at home. However, if it’s one or two degrees down, you need not be disappointed.

Faq’s for RV Tankless Water Heaters

  1. How do I get my RV water heater started?

Wondering how to start your RV with hot water? It is easy to turn it on in most cases: simply find your RV electric water heater switch and switch it to “on.” If your camper water heater is in gas mode, the igniter may have to click on the pilot light, or it may even need to light the pilot light manually. For full info, refer to the manual of your RV owner.

  1. Can I leave my RV water heater ON?

Chances are you’re not continually turning your water heater on and off at home. Similarly, for the duration of your camping trip, you should keep your RV hot water heater on, although there might be some energy-saving advantage of turning it off between uses. On the other side, with the bypass valve still toggled, you will want to ensure you do not power your RV hot water heater. In the absence of water; when the device heats, it can very quickly become impaired.

  1. Can I install an RV tankless water heater?

You probably will. Especially; if you already have some basic knowledge of plumbing and propane tank connections. Since most RVers that I know are handy, it’s probably not something you can’t handle.

  1. Will hard water cause any harm?

Yeah, hard water will ultimately contribute to the heat exchanger’s scaling up and influence how well it performs. It will disable your tankless water heater eventually. You should flush your tankless water heater once a year to disassemble it and keep it running the way it should.

  1. What is the difference between a tankless water heater for condensing and non-condensing?

In essence, a non-condensing RV tankless water heater uses a particular heat exchanger type to heat water on demand. The advantage here is that it appears to be extraordinarily reliable and long-lived. The downside here is that the release of the hot exhaust gases also involves heavy-duty stainless steel venting. This pushes the overall price tag eventually up.

A condensing RV tankless water heater effectively reuses the exhaust system’s heat energy to heat the water. When you use them in short bursts, such as washing hands or rinsing dirty dishes one by one quickly, they also appear to be less energy efficient.

  1. Can I install a Tankless Water Heater in my RV anywhere?

It is possible to install some smaller lightweight tankless water heaters to panel board walls with simple drywall anchors. Although, it’s easier to secure some kind of stud or other structural components for them. Especially with a bulkier device.

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