page title icon 10 BEST RV TANKLESS WATER HEATER of 2021

Are you in a rush of finding the best RV tankless water heater that not only fulfills your warm water needs but also has the best features that you are looking for? If yes then you have stopped at the perfect place to get to know about all the specifications, pros and cons of all the well-known tankless RV water heaters.

RV tankless water heaters are designed in such a compact size and weight so that people can easily carry them in their tours, camps, or any type of excursion. These portable tankless water heaters can provide instant warm water that adds up to the luxuries of users. Comparing it other tank water heaters, these RV tankless water heaters are very suitable for RV setting as they provide a continuous and endless supply of hot water instantly without storing water in a tank and then heating it. Water passes through the body of these heaters and heat exchange occurs either through fuel or by electric coils depending on the type of tankless heater that has been selected. That’s how users can get warm water instantly without having any loss of water and energy.

RV’s are specialized vehicles that are created to give travelers a complete package of comfort just like home. Featured with all facilities of sleeping, kitchen and bathroom do not seem incomplete. But imagine having camps in ice-cold weather, or a business meeting and tiring office work, or a hiking whole day, what you want is to have a warm water shower that disperses all the tiredness and made you feel relax. People usually planned trips towards hilly areas or to do hiking and camping towards the mountains. The cold temperature and the stormy winds desperately call for the warm water shower. Having all the luxuries to go out and enjoy but not having the basic comfort of your body does not seem to be a perfect match.


Our team has researched a lot and presented a list of the best RV tankless water heaters which are given below. Before making your decision, go through the list of top-rated RV tankless water heaters to get the best one for you.

Image Product Details   Price
backpac Suburban SW6DE Brand: SUBURBAN
35.7 Pounds
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backpac Camplux 5L 1.32 GPM Brand: Camplux
14.08 Pounds
3 Volts
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backpac EcoSmart ECO 11 Brand: EcoSmart
ECO 11
6.5 Pounds
220 Volts
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21.2 Pounds
12 Volts
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backpac Camplux 10L Outdoor Brand: Camplux
23.6 Pounds
3 Volts
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backpac Eccotemp i12-LP Brand: ECCOTEMP
28.9 Pounds
120 Volts
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backpac Rinnai V65IP Brand: Rinnai
Model: V65IP
Weight: 45.6 Pounds
Voltage: 120 Volts
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backpac Marey GA10LP Brand: Marey
21 Pounds
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backpac Rinnai V65eN Brand: Rinnai
47.4 Pounds
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backpac Bosch Electric Mini-Tank Brand: BOSCH THERMO TECHNOLOGY
ES4 Tronic 3000 T
17.3 pounds
120 Volts
Check Price

1. Suburban SW6DE

Suburban SW6DE
  • Easy Installation
  • Affordable price
  • Highly durable
  • Additional components are needed

Fabricated with all the best features, Suburban SW6DE stands at the top of RV on-demand water heaters. It provides an endless water supply of 6 gallons per minute which is the best choice for RV. It has a very high recovery rate of 10.2 which means that it provides a large amount of hot water in a very less amount of cycles.

We all know that due to the presence of hot water all the metal bodies are badly affected and become rusted also. Due to the covering of porcelain, it remains unaffected as porcelain can stand up to 1200 degrees centigrade. This feature increases the life span of this RV tankless water heater. Comparing with other tank water heaters, it has an almost double life span and which can be also increased by proper maintenance and care.

The key feature that distinguishes between the tank and tankless water heaters is the time they take to heat water. With a heating capacity of 12000 BTU, suburban SW6DE takes very little time to heat the water to the desired temperature rather than tank water heaters. Direct spark ignition heating system is installed in it that increases its efficiency and make it work better. User is not demanded to pay special attention to the performance of this. Because of its low weight, it can be carried anywhere with ease. It is available at a very low price in the market. Researchers have experimented many times by apply pressure that it is a highly durable appliance.

Key Features

  • DC spark ignition heating system
  • High efficiency
  • Flow rate up to 6 GPM
  • 12000 BTU output
  • Compact size 19.19 x 12.7 x 12.7 inches
  • Recovery Rate of 10.2

2.Camplux 5L 1.32 GPM

Camplux 5L 1.32 GPM
  • Affordable Price
  • Oxygen depletion sensor technology
  • Easy outdoor installation
  • Low water pressure for activation
  • No ON/OFF switch
  • Complain about steam gather up in a close place

Camplux 5L is one of the best RV tankless water heaters that provides a continuous supply of hot water having a flow rate up to 1.32 GPM. This is specially designed for camping and road trips. Looking into the temperature range that it can provide is approximately 46.6 degrees F to 114.8 degrees F.

In terms of safety, it stands among the top listed RV tankless water heaters. It fulfills the safety criteria of CSA. Providing the overheat protection and anti-flaming protection give users a sigh of relief. Oxygen depletion sensors are also installed in it that allows it to use inside the RV with the proper ventilation. In the case of oxygen depletion, it automatically shut off providing safety to the users.

Due to the 2 ‘D’ batteries power technology, it can easily be used in the areas where there is a problem of power shut down. This feature also helps to reduce electricity bills. For the startup, it requires a very low water pressure of 3 to 11 Psi and gas/propane pressure of just 0.4 PSI.

The folding handle facility and low weight make it convenient for users to carry it anywhere. The presence of a copper heat exchanger and stainless steel burner increases its durability. Its price is very low that also attracts buyers towards itself.

Key Features

  • Flow Rate Up to 1.32 GPM
  • Electric Tankless Water Heater
  • Stainless Steel burner and Tinning Copper Heat exchanger
  • 28000 BTU/hour output
  • Battery-Powered Technology
  • Temperature range 46.4 F to 114.8 F
  • Oxygen depletion sensor technologyEnergy-star certified

3. EcoSmart ECO 11

EcoSmart ECO 11
  • Easy outdoor installation
  • Low weight
  • Space-saving appliance
  • Lifetime warranty
  • Less efficient at a temperature higher than 67 degrees F

If you are interested in getting an electric tankless water heater then ECO 11 is the best electric tankless water heater for RV. ECO 11 provides approximately 3.1 gallons per minute of endless warm water making it very suitable for outdoor usage.

Due to the advanced self-modulating technology, the heater adjusts the temperature of water according to the user requirement and activates itself at a very low flow rate of 0.3 GPM. This increases the efficiency of this on-demand tankless electric heater up to 99.8 %. Having this technology also saves energy and causes up to 50% reduction in electricity bills. With the sleek and compact design, it does not take much space and can be easily used in RV as it occupies 90 % less space than traditional tank water heaters. Water flows through this little heater and heats up through the heat exchange of electric coils providing endless hot water as soon as you turn on the faucets.

The LED display in the front of this heater makes it look more attractive. It has a knob in the front just below the temperature displaying LED to adjust the temperature and ON/OFF operation. This control set allows the user to achieve the desired temperature by incrementing/decrementing 1 degree F within the temperature range of 80 to 140 degrees F. For installation, it just requires ½ compressing fitting of water connection that make it very convenient and handy. Getting a lifetime warranty at such a reasonable price, what else can someone want?

Key Features

  • Flow Rate up to 3 GPM
  • Patented Self Modulation Technology
  • Temperature range 80 F to 140 F
  • 99.8 % efficiency
  • External thermostat
  • Digital temperature display


  • 2 years manufacturer warranty
  • No special gas plumbing
  • Compact size 14.5 x 17.8 x 14.6 inches
  • Do not work efficiently at a low pressure environment
  • Additional components expense

GIRARD 2GWHAM is one of the best RV tankless electric heater equipped with modern technologies. It is specially designed to use in RV settings. The temperature of water flowing out of this heater can be controlled by hot water flow. Reducing the rate of flow increase the temperature of the water.

On board processor is used to control most of its features like inlet water flow, outlet water flow, the temperature of outlet water, and steady flow. Controlling features and maintaining the steady temperature through an on-board processor makes it very easy for the user.

Pondering over every feature proves that it is designed for RV and to be used in camps or tours. It has a compact box-like structure having a low weight that can be easily fitted in a small space inside RV. It neither requires any special type of fuel plumbing nor a special gas line just a simple connection thus saving the plumber or electrician expenses.

Having a tour in a hilly area in cold weather and using a portable tankless water heater in RV that is unable to provide freeze protection is nothing more than a box having no use. GIRARD 2GWHAM provides the best freezing protection. Comparing with other heaters of this type, it is the best portable appliance to be used in the winter season. It has a valve to adjust the temperature and water flow on the backside of the heater. Its door and flange have to be bought separately that increases its cost.

Key features

  • Onboard microprocessor control
  • Portable and Lightweight
  • Controlling Feature for Constant water supply
  • Anti-freeze protection
  • Easy installation
  • 42000 BTU/hour output

5. Camplux 10L Outdoor

  • High Flow Rate
  • Highest Efficiency
  • Affordable Price
  • Complain about hose material and connection

Camplux is well-known for its on-demand tankless water heaters for RV due to its extraordinary features. It not only enhances its appliances with modern technology and features but also passes the safety criteria. Camplux 10L has a flow rate of 2.64 GPM. Insulated with the advanced technology ensure to fulfill the hot water requirement of user by providing an uninterrupted continuous supply of warm water as soon the user turn on the faucets.

It not only fulfills the safety requirement of CDA but also provides anti-freezing, flame, low water flow, dry combustion, and high water pressure protection. Turning off the heater automatically as the temperature or pressure exceeded beyond the limit is one of the best features to provide safety to the users.

Discussing its physical components, its burner is made up of stainless steel which is a highly corrosion-resistant alloy while the heat exchanger is made up of tinning copper that performs the heating of water more efficiently. At the bottom of the front side of the heater, there are 3 knobs to regulate the pressure and temperature of the water. By attaching a 12 V Camplux pump with it increase its efficiency. It also has a led temperature display just below the center knob.

Usually, it is best for outdoor uses but if you want to install it indoors, try to adjust it in a place where proper ventilation can occur. It is also powered by 2’D’ batteries so can be used easily when electricity is not needed or available. Thus, it saves energy up to 11.5 % reducing the electricity bills. For star up, it requires a very small pressure of 0.4 PSI while giving out 68000 BTU output. It emits a very less amount of nitrogen oxides and carbon oxides making it very environmentally friendly.

Key Features

  • 2.64 GPM Flow Rate
  • 2 ‘D’ Battery Installation
  • CSA Certified
  • Safety Shut Off
  • Digital temperature display
  • 68000 BTU/hour output

6. Eccotemp i12-LP

Eccotemp i12-LP
  • Energy-saving appliance
  • Front glass panel
  • No pilot lights
  • Stainless steel vent kit
  • Environmental friendly
  • Electronic ignition technology
  • Working efficiency decreases above 2000 ft.
  • Does not offer very high temperature

Tankless water heaters of eccotemp are number 1 selling tankless water heaters for RV. Ecotemp not only ensures the quality of its components but also looks after the physical appearance. Eccotemp i12-LP is suitable to provide a continuous supply of hot water as soon as the faucets open. It has a flow rate up to 4 GPM that is enough to supply warm water for multiple usages simultaneously.

It operates only when warm water is needed. Pilot lights are tiny lights indicating the ignition of burners hence increasing the usage of energy. Ecc0temp i12-LP does not have any pilot lights thus reducing the energy consumption. Insulated with automatic temperature control technology also helps to save energy.

With the sleek and modern outlook, it becomes one of the bestselling tankless water heaters. Its front panel is made up of glass with a digital display at the bottom. On turning ON the heaters, the LED also turns ON displaying the temperature of water otherwise the front Glass looks like a panel reflecting box. Temperature can be changed according to the user’s choice by the touch buttons of the LED display control embedded around the LED.

Having a trip with your family is beautiful but looking after children all the time so they do not get harm themselves is a major headache for parents. People are usually afraid of taking water heaters with them but Eccotemp i12-P gives relief to the parents through its child-lock technology. No need to worry just grab this amazing tankless water heater for the RV. The emission of fewer gases due to the ignition of electric pulses also makes it very environmentally friendly.

Key features

  • Compact size 13.7 x 25 x 5 inches
  • Child lock technology
  • Digital temperature display
  • Automatic temperature control
  • 2-year manufacturer warranty
  • Flow rate up to 4 GPM
  • Up to 80000 BTU output
  • Technically more advance

7. Rinnai V65IP

Rinnai V65IP
  • Energy factor of 0.82
  • Convenient installation
  • Wi-Fi connection
  • Requires proper venting system

Rinnai is a famous brand popular for its best rinnai tankless water heaters with amazing and fascinating features. Rinnai V65IP is a fuel-based tankless water heater using propane as fuel and providing hot water with a flow rate of 6.5 GPM that is approximately enough to supply water for three to four showers simultaneously without any interruption.

Integrated with thermaCirc360 technology, it is very convenient to use. By just installing an app on your phone or connecting it with Wi-Fi, users can easily operate it and maintain the temperature. By varying the temperature through cell phones, the user does not have to wait for the water to obtain the desired temperature. Thus it is the best time-saving appliance. The time when the user is not at home and forgot to turn off the heater, don’t worry about the energy usage as it allows to put the system automatically on vacation mode, making it a highly energy-efficient device.

Buying an appliance without having a sufficient warranty is not an intelligent approach for buyers. Rinnai i12-LP offers a 12-years heat exchanger warranty and for parts, it gives 5-years warranty. Don’t worry about any repair issue as it also blesses buyers with a 1-year labor warranty. The components of this propane tankless water heater are separately available in the market. In case of any error in one component does not lead to buying the whole system as they are easy replaceable. As compared with other high-rated RV tankless water heaters, they emit less carbon dioxide gases thus making it more environmentally friendly.

Key Features

  • 6.5 GPM Flow Rate
  • Digital Temperature Display
  • Compact Size 14.04 x 9.27 x 26.9 inches
  • Continuous Hot Water Supply
  • 12-years heat exchanger warranty and 5-year parts warranty
  • Labor warranty of 1-year
  • Vacation mode
  • ThermaCirc360 technology
  • Temperature range of 98 to 140 degree F

8. Marey GA10LP

Marey GA10LP
  • High efficiency of 87 % efficiency
  • Less electricity consumption
  • Affordable price
  • Battery design needs to be modulated
  • Low water heating capacity

Marey GA10LP is a very popular RV tankless hot water heater. Installation for this tankless water heater is so easy that buyers usually prefer this for their RV setting. It does not require any special or complicated connections.

With a flow rate of 3.1 GPM, Marey GA10LP provides continuous hot water enough to fulfill the needs of RV and camping. It does not require any kind of electrical connections thus reducing the electricity bills up to 60 %. People preferably use it in the areas with frequent power shut down and also in RV. With a compact size of 6.9 x 13.6 x 23.6 inches, it saves more space and can be adjusted anywhere whether in houses or RV.

The temperature of this on-demand tankless water heater is controlled by knobs present on the front panel. It also provides a 5-year warranty. For ignition, it used 2 ‘D’ batteries making it more efficient. It has a high efficiency of 87 %. Because of its less weight and high price, people prefer this tankless water heater. In contrast with ordinary tank water heaters, it has a double life span. As it does not store water in it thus preventing the tank from corrosion. The small price of this tankless water heater with spectacular features makes it more budget-friendly.

Key features

  • Flow rate up to 3.1 GPM
  • Compact size 6.9 x 13.6 x 23.6 inches
  • Simple and convenient installation
  • 5-year warranty
  • The flow rate of 3.1 GPM
  • 2 ‘D’ battery ignition

9. Rinnai V65eN

Rinnai V65eN
  • High Flow Rate
  • Affordable Price
  • Wi-Fi connection
  • Require more amps than standard

Boasted with high heat capacity, Rinnai V65eN can provide hot water instantly. It is designed for outdoor installation and has the best features to satisfy any buyer. It has a high flow rate of 6.3 GPM as compared to other tankless hot water heaters for RV. This high flow rate is sufficient to provide warm water in multiple faucets at the same time.

Due to natural gas operation, its cost is comparatively low and requires low maintenance. It provides a temperature range of 98 to 140 degrees F. Wi-Fi connection helps to make its operation more convenient. Having a compact size makes it a space-saving appliance. It saves 40 % less energy than other traditional water heaters making it more energy-efficient.

Incorporated with ThermaCirc360 technology, recirculation of hot water occurs continuously giving out a sigh of relief to its user. It consumes less gas and also emits less carbon dioxide making it more environment friendly. Components of Rinnai V65eN are easily swapped instead of buying the whole heater.

Key Features

  • 6.3 GPM Flow Rate
  • Unique Design that saves space
  • 120000 BTU output
  • Energy factor of 0.82
  • Less carbon dioxide and nitrogen oxides emission

10. Bosch Electric Mini-Tank

Bosch Electric Mini-Tank
  • Small size and weight
  • Super-insulated
  • Very simple installation
  • Money-saving appliance
  • Some customers complain about water leakage

BOSCH ES4 Tronic 3000T is a mini tankless water heater for RV water requirements. This mini tank can be easily fitted right below the sink or any other small place and is an effective solution to warm water problems. It has a maximum flow rate of up to 4 GPM.

Glass lining increases the durability and provides more insulation. It has a dial-in on the front that is used to control the temperature ranges. Discussing the high recovery rate, users do not have to wait long for the desired temperature water. ½ male NPT connections do not need a plumber or electrician for installation. Convenient to install both indoor and outdoor. Looking into its price gives a shock to buyers as it is available at a very low price under 200 $.

By looking into this mini tankless water heater puts buyers into doubt that how will it be able to fulfill warm water requirements? But amazingly, it fulfills the warm water demand of any RV easily. Bosch offers 6 years warranty on this mini-unit and also 2 years warranty on its parts.

Key features

  • 4 GPM flow rate
  • 98 % thermal efficiency
  • 0.82 energy factor
  • Less energy consumption
  • Compact size 13.75 x 13.5 x 13.75 inches
  • On unit 6-years warranty and 2-years parts warranty


Ultimate Buyer’s Guide to Buy Best Propane Tankless Water Heater

Reading all the facts and figures about the best RV tankless water heaters, buyers are usually in a state of confusion to choose the best for their rv. It is usually impossible to buy a product with all features that are all perfect. Buyers have to compromise on some features keeping in view their requirements. By reading the following properties, you will be able to select the best RV tankless water heater for you.

Flow Rate (GPM)

The RV tankless water heaters used in RV usually do not require a high flow rate. Depending upon the water requirement in your RV, select the tankless water heater with a suitable flow rate. If you want warm water for multi-purposes then select a tankless water heater with a high flow rate.

Input power source

Tankless water heaters are of different types and differentiated by the mean of input power supply like propane, natural gas, or electricity. The buyer should keep in mind the availability of power supply inside their RV before buying the tankless heaters. Usually, propane tankless water heaters are preferable for RV.


Before buying any appliance or even a product people should keep a budget in their mind. Usually, the gas heaters are less expensive while electrical tankless heaters are expensive. Always select an appliance with maximum features while staying in your prime limit.

Heating capacity

Heating capacity is the amount of heat transferred to the water to raise its temperature. It is a measure in the British Thermal Unit (BTU). Having a high BTU rate means more heat is transferred to water in a short time hence raise the water temperature more quickly. Buyers must look into the heating capacity before buying. For RV, a tankless heater with a minimum of 30,000 BTU is suitable.


Using the tankless water heaters at homes is easy to use as after installing these heaters at home, they usually do not require to move out again and again. Setting the tankless water heaters in RV needs to usually install at different places and require to move out again and again. So, the buyer should never compromise on the durability of tankless water heaters for the RV.


Depending upon the available space inside the RV, the buyer should select the tankless water heater. Usually, buyers are looking for small size RV on-demand tankless water heaters with maximum features. Size should be selected by keeping in view your water usage.


Which of the condensing or non-condensing tankless water heater is more efficient?

Condensing water heaters use the heat energy of the exhaust system thus decreases the energy requirement. Hence, they are more energy-efficient.

Do I need to maintain an RV tankless water heater?

Maintenance is necessary for every appliance for its better efficiency. Check the anode rod periodically and change it when it gets severely damaged. You must clean the water heater with some vinegar or other substance frequently.

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