If you love biking, hiking, and doing outdoor activities with your family and friends, then having enough hot water in your RV is incredibly important. However, standard hot water tanks have an average capacity of only 6-10 gallons, making them unsuitable for groups of five or more.
Fortunately, RV tankless water heaters help solve this problem. They enable you and your entire group to enjoy soothing, warm showers after a tiring day of outdoor activities.
To help you find a model that provides a limitless supply of nice, hot water, this guide includes detailed reviews of some of the best tankless water heaters, the different types available, and the factors to consider before buying one. So, make sure you stick through till the end before you make your purchase!
At a Glance: Our Top Picks for RV Tankless Water Heaters
- OUR TOP PICK: Camplux 10L Outdoor 2.64 GPM Tankless Water Heater
- RUNNER-UP: Marey GA10LP
- EZ 101 Tankless Water Heater
Comparison Chart of the Best RV Tankless Water Heaters
| IMAGE | PRODUCT | |
|---|---|---|
Our Top Pick  |
| View Latest Price → |
 |
| View Latest Price → |
 |
| View Latest Price → |
 |
| View Latest Price → |
 |
| View Latest Price → |
Best Budget Option  |
| View Latest Price → |
 |
| View Latest Price → |
What Should I Look For When Buying a Tankless Water Heater?
A tankless water heater is a great investment and an incredible addition to your vehicle. It is connected to the onboard water tank and provides you with hot water whenever you need it. To ensure you don’t end up wasting your money, here are some factors you should consider before you finalize your decision:
Water Consumption
Before buying a tankless heater, make sure you know what your average water consumption is. This will give you a better idea about the size of the heater you need. For example, people usually use an average of one to three gallons of water per minute when showering.
Water Flow Rate
Arguably the most important feature to consider, the flow rate can be simply defined as the amount of hot water released by the unit every minute. Since most people use this heater for showering, it’s advisable to choose a model that supplies approximately 2 to 2-and-a-half gallons of water per minute.
BTU
British Thermal Units are used to measure the heating capacity of the product. By considering the BTUs, you’ll have a better idea about the amount of heat you’ll need according to the different places you plan on traveling to.
Protection
Make sure the model you purchase has a durable, sturdy construction that won’t be damaged by rough terrain and poor weather. Furthermore, it’s also advisable to choose models with features that protect it from electronic ignition and voltage spikes and shortages.
Review of the Best RV Tankless Water Heaters
Tankless water heaters ensure you have hot water whenever you need it. However, with so many models available, choosing the best heater is no easy task. To ensure you find a unit that perfectly suits your needs, here are detailed reviews of some of the best RV tankless water heaters available today:
Best RV Tankless Water Heater
Camplux 10L Outdoor 2.64 GPM Tankless Water Heater
Specifications
Max Water Flow (GPM): 2.64
Energy Factor (EF): N/A
Dimensions: 12.8 x 5.91 x 20.28 inches
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
Most buyers were extremely satisfied with their purchase and found that it heated up water quickly and effectively. Users stated that it was incredibly easy to set up and loved the water pressure it provided. They were also impressed with the company’s customer service and stated they quickly resolved any issues they experienced. However, customers were disappointed with the poor quality regulator, while some reported that the unit stopped working after only a few uses.
Why it Stands Out to Us
With an impressive water output that’s even higher than other models, this unit provides 2.64 gallons of water per minute. It also stands out to us because of its multifunctional showerhead. This allows users to easily change or adjust its settings to achieve the required hot water temperature.
Who Will Use This Most
Since the unit is portable, it’s perfect for cabins, campsites, horse stables, or just around the house. It can also be used for boondocking or off-grid camping. It’s also ideal for campers or smaller RVs without a shower, including foldable and teardrop campers. Its anti-freeze protection further makes it perfect for use in extreme winter conditions.
Bottom Line
One of the best and most reliable brands available today, this unit is extremely convenient to use. Different than other models, it also works as a small, portable outdoor shower. It’s designed with a handle that can be attached to any wall, further adding convenience and ease of use. However, the quality of the regulator could be improved.
Pros
High thermal efficiency rate of 88.5% saves money
Full/Eco switch function helps save more gas in the summers
Includes CSA-approved gas regulators and all the required adapters
Lightweight and compact design with around 11.5% energy-saving technology
Over-heating protection, flame failure device, and anti-freezing protection ensure safety
Cons
Quality of the shower hose is a bit poor
Water temperature is a bit difficult to adjust
Cannot be used in campers or enclosed RVs
Runner-up
Marey GA10LP
Specifications
Max Water Flow (GPM): 2.7
Energy Factor (EF): N/A
Dimensions: 6.9 x 13.6 x 23.6 inches
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
Some stated that it heated water quickly, was able to run two showers easily, and loved its water pressure and temperature display. They also found temperature adjustments and the setup process to be extremely easy. However, some were disappointed with the design of the battery compartment. Some users also reported that it changed water temperature frequently and needed a lot of flow to start the heating process.
Why it Stands Out to Us
This unit primarily stands out to us because of its design. Constructed with a stable, secure connection, it ensures no leaks. It’s also rustproof, so you won’t have to replace the anode rod. Furthermore, it is manufactured with eco-friendly components and is designed to last many years.
Who Will Use This Most
If you’re looking for a dependable and highly remarkable tankless water heater for your RV, then this unit is the one for you! Since it does not require any electricity, it’s also ideal for use in areas with frequent power outages. Its 3.1 GPM capacity further makes it perfect for a large family.
Bottom Line
A close second, this unit is incredibly consistent when it comes to delivering outstanding performance. It operates without any electricity and is able to heat an unlimited amount of water according to your needs. However, it is not suitable for use at higher altitudes.
Pros
Backed by a 5-year warranty
Extremely durable with an efficiency level of 87%
Works easily and effectively with low levels of water pressure
Compact design takes up less space and can be easily installed anywhere
Does not require any electrical connection, saving almost 60% in electricity bills
Cons
Not suitable for apartment homes
Might not work at higher altitudes above 2000 ft
Water temperature can be a bit difficult to adjust with faucets
Best for the Money
EZ 101 Tankless Water Heater
Specifications
Max Water Flow (GPM): 2
Energy Factor (EF): N/A
Dimensions: 4.7 x 11.8 x 17.5
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
The majority of the users found that it provided excellent value for money and said they would not hesitate to purchase it again. They stated that the temperature and water flow remained constant and it did not leak. Buyers also liked the flexibility of different temperature, burner, and flow adjustments. However, some customers found that it did not provide enough heat, while others found the gas pressure flow to be too sensitive.
Why it Stands Out to Us
Boasting automatic operation, this unit fires up automatically when you open the faucet. It also extinguishes the flame automatically once the water supply is turned off. Designed with multiple control knobs, it further enables users to adjust and regulate the water flow and heating temperatures easily. Moreover, the built-in, 20-minute timer provides increased protection.
Who Will Use This Most
This model does not require an electrical plug-in, making it perfect for camping and hunting expeditions. It can also be used for semi-permanent installations at small cabins or lake homes, open shelters, campsites, barns, workshops, sheds, or any other open area that has excellent ventilation. It is also ideal for people living in remote rustic homes and cabins with only one bath.
Bottom Line
A popular product, this model does exactly what it’s designed to do at an incredibly affordable price. Featuring a simple design, it’s the perfect solution for heating water when out camping or doing other outdoor activities. However, the flow rate might be a bit too low for some people.
Pros
Provides a thermal efficiency rate of almost 85%
No pilot light design makes it convenient and safe to use
Compact and lightweight design makes it incredibly portable
Built-in 20-minute timer protects against carbon monoxide poisoning
Enables users to adjust the water flow and heating temperature easily
Cons
Flow rate might be a bit low for some users
Prone to freezing if used in extremely cold temperatures
Best RV Electric Tankless Water Heater
PrecisionTemp RV-550
Specifications
Max Water Flow (GPM): 1
Energy Factor (EF): N/A
Dimensions: 13.5 x 13.5 x 14.25 inches
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
The majority of users stated that the unit was worth every penny and worked just as advertised. They said it provided consistent hot water and loved its silent operation. One customer even said that they opened two showers and all the faucets at the same time, and the unit still provided hot water. However, some customers reported receiving defective items and were unable to control the water temperatures.
Why it Stands Out to Us
This unit’s efficiency is what makes it stand out from the crowd. With a 20-lb. propane tank, it’s able to provide approximately 940 gallons of water. It can further reach 50,000 BTUs, making it extremely effective in supplying hot water. Moreover, it boasts a 1.5 GPM flow, which ensures a decent water temperature whenever you need it.
Who Will Use This Most
Featuring a good construction design and high-quality materials, this unit is perfect for full-time RVers looking for a decent and efficient heater. It has several different applications, including cabins, trailers, mobile washing services, and tiny houses.
Bottom Line
Ideal for several different uses, this unit is certainly the best electric tankless water heater for RVs. It has an incredibly compact and small size, making it extremely easy to manage. While it boasts an efficient and quiet operation, it has a heavier price tag than other models.
Pros
Takes up half the space as a 10-gallon tank
Built-in freeze protection enables four-season use
Incredibly high propane efficiency and no pilot light design
VariFlame technology control system ensures durability and reliability
Normal operation requires less than 1.5 amps, and cold weather protection requires almost 3 amps
Cons
Is quite bulky and heavy
Bit expensive than other models
Best RV Tankless Water Heater Propane
Camplux 5L 1.32 GPM
Specifications
Max Water Flow (GPM): 1.32
Energy Factor (EF): N/A
Dimensions: 11.42 x 4.33 x 14.8 inches
Water Temp Range: Low 8℃- High 46℃
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
Almost every user loved this unit and stated that it worked as advertised. They found it extremely easy to install and said it was very easy to find the right temperature. Buyers also reported that it provided hot water instantly and recommended it to other people, as well. However, some customers reported that the unit caught on fire after a few days of use.
Why it Stands Out to Us
This unit primarily stands out to us because of its portability. Its lightweight and compact design enables users to take it to different places. The folding handle further ensures that it doesn’t get in your way when you’re installing it outdoors. It also does not require any wall venting, making it even easier to use.
Who Will Use This Most
If you need a durable and reliable unit you can take anywhere, then this model is perfect for you! It’s ideal for camping, mountain cabins, family vacations, and horse stables. The Oxygen Depletion Sensor Protection further makes it perfect for indoor use where it’s well ventilated.
Bottom Line
Perfect for RV owners and families who travel often, this unit provides a constant supply of hot water whenever you need it. With an efficient and silent operation, it helps save a lot of water and energy. However, it has a lower supply rate than other models.
Pros
Only needs 3.0 PSI of water pressure
Allows users to adjust the flow rate and heat easily
Hot water output of 1.32 GPM provides a consistent hot water supply
Folding handle and compact size ensure a convenient and easy setup process
Anti-freezing protection, oxygen depletion safety shut-off, and flame failure device makes it extremely safe to use
Cons
Heavier price tag than other models
Does not have a draining system or outlet
Lower water supply rate compared to other models
Best 110V Tankless Water Heater for RV
Mini Instant Water Heater Electric Under Sink
Specifications
Max Water Flow (GPM): N/A
Energy Factor (EF): N/A
Dimensions: 5.3x 2.4 x 6.6 inches
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
This model has received mixed reviews. Some users loved its performance and stated that it heated water quickly. They also found it extremely easy to install. However, some buyers were disappointed with the low water flow, while others reported it did not heat up water at all.
Why it Stands Out to Us
Rather than waiting before an open faucet and wasting cold water, this unit is innovatively designed to hasten the heating process. You only need to wait for about three seconds, and the model will provide you with constant hot water to meet your washing demands.
Who Will Use This Most
Manufactured for low flow use, it can be easily installed under the sink in the bathroom and in the kitchen. This unit is perfect for washing your hands and face, and for dishwashing. However, it’s not ideal for outdoor use, including campers, motorhomes, and dining cars.
Bottom Line
Small and affordable, this unit is undoubtedly the best 110V tankless water heater for an RV. With a space-saving and compact design, it provides instant hot water whenever you need it, while its safety features make it extremely safe to use. However, it cannot be used to take hot showers.
Pros
Heats up water in 3-5 seconds, saving your time
Mounted installation system makes it extremely easy to set up
Leakage protector automatically powers off the unit when leakage is detected
Liquid digital temperature display adjusts water temperature according to the water flow
House insulation protection, anti-dry protection, and hydroelectric isolation protection makes it incredibly safe to use
Cons
Might not provide hot water constantly
Water flow might be too low for some people
Best Girard RV Tankless Water Heater
Girard 2GWHAM
Specifications
Max Water Flow (GPM): N/A
Energy Factor (EF): N/A
Dimensions: 14.5 x 17.8 x 14.6 inches
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
Most users were impressed with this unit and recommended it to other potential buyers, as well. They said it worked perfectly, quietly, and provided hot water instantly. Buyers also found installation to be very easy. However, some customers reported receiving defective items, while others stated that the unit stopped working after a few months of use.
Why it Stands Out to Us
This unit stands out to us for several different reasons. Firstly, the automatic monitor detects incoming and outgoing temperatures and makes adjustments accordingly. Secondly, its freeze protection ability enables users to enjoy hot showers in extremely cold conditions, as well. Lastly, it has a quiet operation, so your sleep won’t be disturbed.
Who Will Use This Most
If you’re looking for a new heater for your RV or motor home, then this unit should certainly be on your list. It boasts freeze protection, which further makes it ideal for use in winters. With 42,000 BTUs, it can provide hot water for the whole family.
Bottom Line
One of the latest models from Girard, this unit is incredibly easy to operate and keeps hot water at the desired temperature. Its onboard microprocessor ensures a constant hot water flow, while its brushless motor boasts a quiet operation. While it does not require any special plumbing or LP line, you will need to buy the mounting hardware separately.
Pros
Brushless motor ensures a quiet operation
Freeze protection makes it perfect for winter use
Large burner regulating capacity maintains the flow of hot water
Onboard microprocessor controls and monitors the outgoing hot water and incoming cold water temperatures for constant hot water flow
Cons
Heavier price tag than other models
Mounting hardware has to be purchased separately
Best Atwood Tankless Water Heater for RV
ATWOOD GC6AA-10E
Specifications
Max Water Flow (GPM): N/A
Energy Factor (EF): N/A
Dimensions: 21 x 17 x 15 inches
Water Temp Range: N/A
We may earn commission from purchases made from our links, at no additional cost to you
What Recent Buyers Report
The majority of buyers were extremely satisfied with their purchase and stated that the unit worked as advertised. They found installation to be fairly straightforward and said it provided plenty of hot water. However, some users reported that the metal shroud interfered with closing the door, while others felt the instruction manual could be improved.
Why it Stands Out to Us
The unit’s flexibility is what truly makes it stand out from its competition. A combination of gas and electric elements, it boasts a high 8,800 BTU input and a faster recovery rate. The electric element is capable of delivering hot water output of 6.2 Gal/Hr, while the gas element delivers an output of 11.6 Gal/Hr. When combined, the total recovery rate totals to 17.8 gallons per hour.
Who Will Use This Most
With several different applications, this unit provides hot water wherever and whenever you need it. It’s ideal for use in homes and RV camping, while its six-gallon capacity further makes it perfect for almost all family and RV needs.
Bottom Line
Truly the complete package, this product will certainly make RV life more convenient. Manufactured by one of the most reliable brands, it ensures excellent quality and outstanding performance. While it is designed with both electrical and gas elements, it has a heavier price tag than other models.
Pros
Features both electric and gas element options
95% of the components can be serviced or replaced
Does not require any special plumbing and has an incredibly easy setup process
Aluminum clad tanks eliminate the need for aluminum anodes for corrosion protection
Temperature control, pressure relief, and high-temperature limit switch make it safe to use
Cons
Bit more expensive than other models
Domestic switches might be disappointing for some
Perks of Getting a New Tankless Water Heater For Your RV
Tankless water heaters help save energy and space. Along with providing hot water on demand, some other benefits of the unit include:
Environment-Friendly
As the name suggests, these units don’t need a tank to heat water but heats it directly, as needed. This saves energy and uses less gas, making them a greener and more environment-friendly option.
Eliminates the Need for Waiting for Hot Water
One of the biggest advantages of tankless water heaters is they ensure a constant supply of hot water whenever you need it, especially those with a higher recovery rate. They also use less propane or gas, resulting in a lower operating costs, as well.
Portability
These units are usually smaller in size and don’t take up a lot of space in your vehicle. They are incredibly portable, allowing you to take them anywhere, without worrying about their heavy weight or bulky size. Since you have limited space in your recreational vehicle, you can also fit them easily in smaller or hidden places.
Gas Savings
Since tankless water heaters are incredibly efficient, they also use LP and propane more efficiently. In other words, they are fuel-efficient, ensuring you don’t run out of fuel fast.
Types of Tankless Water Heaters
There are several different types of RV tankless water heaters, each designed with a different heating process. Some of the most common types include:
Electric
Electric heaters are popular because of their cost-effectiveness and environment-friendly nature. Since they are primarily powered by electricity, they are extremely easy to install. Users can even use a solar panel or generator to provide the heater with a constant supply of electricity.
Gas-Fired
This unit uses kerosene or propane to heat water and requires venting for proper operation. In fact, it is designed with flues that are typically larger than those found in gas storage heaters. It usually features power vents that allow exhaust gases to flow to a sidewall. When it comes to installation, some form of venting is required. However, this unit releases greenhouse gases, resulting in only an 85% efficiency rate.
Non-Condensing
These models are widely known as the first generation of water heaters. Using a heat exchanger to heat water, they have a lower energy-efficiency rate, compared to other water heaters. This energy-efficiency further drops when you use large amounts of hot water in short draws, like when washing hands.
Condensing
The second generation of tankless heaters, these models are designed with a second heat exchanger. They reuse the heat released by an exhaust to heat the water even further. This method is extremely beneficial and results in a higher efficiency rate of around 92% to 94%.
How to Flush an RV Tankless Water Heater
It’s advisable to check and clean your unit at least twice every year. However, if you’re a full-time RVer, it’s better to clean the heater several times a year. If you store your RV during the off-season, then the best time to clean the heater are; before storing it and when you de-winterize your vehicle. This helps reduce and virtually eliminate the build-up of scale and calcium deposits. It also helps clean the heating element, ensuring the unit works at peak efficiency.
Here are some steps you can follow to flush your tankless water heater before you store it for the season:
- Turn off the gas and power to the heater
- Drain all the hot water from the tank
- Turn off the water supply to the vehicle and turn off the power to the water pump
- Open all the hot water faucets of the RV
- Open the relief valve on the heater
- Remove the drain plug from the unit and allow water to drain. If the tank is equipped with an anode rod, replace it once a year, or when it’s 75% consumed
- Flush the heater tank by turning on the water supply. You can also use a flushing wand.
- Turn off the water supply
- Install the anode rod or drain plug with a correct thread sealant
However, there are some extra steps you’re going to have to follow if you plan on using your RV immediately:
- Close all water faucets and turn on the water supply until water starts coming out of the relief valve
- Turn off the water supply
- Close the relief valve once the water stops coming out of it
- Turn on the RV’s water supply
- Close the faucets once the water starts coming out of them without any air gaps
- Check for any leaks in the heater
- Open the faucets to get rid of any air in the lines, then turn on the unit’s gas or power
- Check the unit again for any leaks after an hour
To get a better understanding of how to flush a tankless heater, you can watch this video below:
Conclusion
Buying the perfect RV tankless water heater can become an incredibly easy decision if you know what you’re looking for. Make sure it’s constructed with rust-resistant and high-quality materials, so the water stays clean and uncontaminated. Above all, choose a model that perfectly suits your needs.
For us, the best unit is the Camplux 10L Tankless Water Heater, but make sure you go through all the aforementioned reviews before finalizing your purchase!
People Also Ask
Choosing the right tankless water heater can be an incredibly difficult and technical task. To clear any confusion you might have regarding the unit, the following are some of the most frequently asked questions:
RV water heaters are simply smaller and more compact versions of the standard residential heaters. You can leave it on all the time, but it’s economically and environmentally better to turn it on only when you’re going to need it.
1. Shut off the main shut-off valve’s water supply
2. Open all taps and faucets, so pressure from the plumbing system is drained and released
3. Disconnect outgoing and incoming water pipes from the unit
4. Remove the inlet water filter and collect all residual water in a bucket. Make sure all water is fully drained from the system
Propane RV water heaters take around 51 minutes to heat up a ten-gallon tank, and around 31 minutes for a six-gallon tank. However, using electrical or both elements can result in much slower or quicker heating times.
Every reputable brand of tankless heater needs a drain pan if the unit is set up where a leak can damage the building or home. Engineers understand that similar to tanks, tankless heaters also start to leak once they reach the end of their life.
As the name suggests, a neutralizer neutralizes the acidic water that collects in the unit’s secondary heat exchanger. It uses connectors to connect to the unit’s condensate drain port and then raises the condensate’s pH level, enabling safe discharge into the sewer system.
