Get Instant Hot Water In Your Camper With An RV Tankless Water Heater
What’s the worst thing that could happen while showering in your RV, tiny house, or mobile home? Running out of hot water. Most RV water heaters hold just 6 gallons, giving you about 10 minutes of hot water when mixed with cold.
Tankless water heaters are a game-changer for RVs. They provide endless hot water by heating on demand, making them far more efficient than traditional tanks. Instead of continuously heating unused water, a tankless system activates only when water flows. Propane ignites instantly, and water goes from cold to hot in seconds.
The only way to run out of hot water is if you run out of propane, 12V power, or fresh water while boondocking.
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In this review, I’ll cover the benefits of RV tankless water heaters and answer common questions. If you have questions, leave a comment, and I’ll help you out.
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Last update on 2025-04-23 / Affiliate links / Images from Amazon Product Advertising API
Best Portable Tankless Water Heaters Reviews & Info
Most portable tankless water heaters for camping are designed for outdoor mounting, making them ideal for RVs and vans where space is limited. These heaters are perfect for outdoor showers and are highly versatile, as they can be moved easily and used with various water sources.
While built to withstand rain, it’s a good idea to create a cover for the heater when not in use, especially if mounted on the back of your camper. Protecting it from sun and dust will keep it cleaner and functioning better over time.
Proper ventilation is crucial for these heaters. For example, some setups mount the heater inside a van door, allowing it to be protected when closed and properly ventilated when the door is open during use. This approach safeguards the unit from the elements while ensuring safe operation.
Wherever you mount or use your portable tankless water heater, always make sure it has good ventilation and that all gas connections are secure and leak-free. For those looking to replace a traditional RV water heater, check out the indoor tankless options listed below.
1. Camplux Pro 6L Portable Tankless Water Heater
Camplux offers a range of portable tankless water heaters, stoves, grills, and electric water heaters, making them a great choice for campers and RV enthusiasts.
The Camplux Pro 6L Tankless Propane Water Heater is an excellent option for small spaces, while a larger 10L model is available for those with more room and higher water demands.
The 6L model delivers up to 1.58 gallons per minute (GPM) of hot water, making it suitable for low-pressure water systems between 3 and 110 PSI. A standard 12V RV water pump, which typically outputs around 3.5 PSI, works perfectly with this unit.
Key Features:
- Comes with a showerhead for easy outdoor use, requiring minimal installation.
- Can be connected directly to your RV’s water system as a replacement for a traditional heater, provided adequate ventilation or outdoor mounting is ensured.
- Includes a gas regulator for use with any propane tank size, burning up to 41,000 BTU/hour.
- Temperature rise ranges from 46.4℉ to 167℉, though output temperature depends on factors like GPM, water flow, and pressure. Slower flow results in hotter water.
The Camplux Pro includes combustion protection, flame failure prevention, anti-freezing features, and an oxygen depletion sensor (ODS) shutoff for safe operation. It’s designed with a convenient handle for portability, weighing just 16 pounds and measuring 17.3 x 11.6 x 4.3 inches. The larger 10L model is heavier but delivers faster hot water output.
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This unit uses propane gas and requires two “D” cell batteries for ignition. It’s fully compatible with 12V water pumps, making it ideal for off-grid camping setups.
The Camplux Pro Portable Tankless Water Heater comes with a 3-setting showerhead with an on/off switch, a shower hose, a CSA-approved gas hose and regulator, two garden hoses, a gas inlet connector, and water tape.
This compact unit is a great addition to any camper or RV, offering reliable hot water on demand.
PROS
- Portable
- Showerhead & Hose Included
- Regulated Gas Hose Included
- Good Rain Resistance
CONS
- Not Rated For Drinking Water (Can’t Drink Water From It)
- Not Good In Wind
- Low Quality Accessories
2. Hike Crew Portable Propane Water Heater
The Hike Crew Portable Propane Water Heater is a compact, modern, and highly portable option for campers, van dwellers, or RVers who want a convenient outdoor shower or an additional water heater. It’s ideal for those with limited space or looking for flexibility in water heating.
Key Features:
- Includes an integrated pump and showerhead for convenience, requiring only connections to gas, water, and electricity (DC or AC) for operation.
- Compatible with 1 lb propane tanks, making it easy to carry and set up. For larger propane tanks, an adapter is required.
- Comes with an AC adapter for standard outlets and a 12V cigarette plug for battery or vehicle power.
- Features a temperature dial and an LCD display for precise control, with a maximum temperature of 125°F.
- The showerhead attaches to a fold-out tap on the back, which can also be used for hot water for dishes or handwashing.
- Weighs only 13 lbs and measures 12 x 12 x 9.6 inches, making it easy to transport and store in the included carrying case.
- Equipped with a gas regulator for safe propane connections.
- Built for outdoor use and not easily mountable to an RV or van, but its portability makes it ideal for remote locations or as a secondary water heater.
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If you need a flexible, easy-to-use solution that works with minimal water pressure and is compatible with a 12V battery, the Hike Crew Portable Propane Water Heater is an excellent choice for camping and outdoor activities.
PROS
- Built In Water Pump
- Showerhead & Hose Included
- Propane Regulator Included
- Can Connect To Small 1 lb Propane Tanks
- Lightweight
- AC & DC Power Options
- Extremely Portable
CONS
- Cannot Be Wall Mounted
- Can’t Connect To Main Camper Water Lines
- Need Adapter For Larger Propane Tanks
- Can’t Reach Very High Water Temperatures
Best Indoor RV Tankless Water Heaters Reviews & Info
This type of RV on-demand water heater is designed as a direct replacement for the standard hot water heater in your camper. It connects seamlessly to your RV’s main water system and is installed indoors, offering protection from the elements.
Pros:
- Integrates directly with your RV’s plumbing, eliminating the need for additional connections.
- Indoor installation keeps the unit safe from weather and debris.
- Installation is straightforward for most RV models.
Cons:
- More complex than portable tankless water heaters.
- Considered a premium option, often with a higher cost.
Despite the higher price and complexity, this style of water heater is ideal for RVers looking for a reliable, long-term solution that fits into their existing system.
3. Girard On Demand RV Water Heater
The Girard 2GWHAM On-Demand Tankless Water Heater is a top choice for RVers looking to upgrade from traditional water heaters. It offers endless hot water and reliable performance, making it ideal for modern RV living.
Key Features:
- Rated at 42,000 BTUs, providing consistent, powerful heating.
- Delivers at least 2 GPM, suitable for comfortable showers and faucet use.
- Features ECO max temperature of 140°F and allows preset adjustments for efficiency.
- Connects to existing 12V power, gas, and water lines for seamless replacement.
- Measures 15.5 x 22.5 x 12.5 inches and weighs 22 pounds, though slight modifications may be needed for installation.
If the exterior water heater hatch is too small, adjustments can be made to fit the unit. The water heater door is sold separately.
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The Girard On-Demand RV Water Heater is a fantastic option for RVers upgrading to a tankless system, offering superior functionality and efficiency.
PROS
- Can Connect To Camper Water Lines
- Direct Replacement For Most Standard RV Water Heaters
- 42,000 BTU
- Uses 12V RV Power
- Auto Burner & Water Temperature Regulation
CONS
- Must Be Used With An RV
- Cannot Be Used Outdoors
4. PrecisionTemp RV-550 Tankless Water Heater
The PrecisionTemp RV-550 Tankless Water Heater is a top-tier option for RVs, cabins, and tiny houses, offering exceptional performance, efficiency, and reliability.
This model delivers ample hot water while conserving propane and electricity, making it ideal for full-time RVers or those spending extended periods in their camper.
Key Features:
- Rated at 55,000 BTUs, ensuring a powerful and consistent hot water supply.
- Modulates propane usage automatically based on water flow and incoming temperature, maintaining consistent water temperature without wasting gas.
- Operates at 1.5 amps during normal use and 3 amps with built-in cold-weather protection.
- Automatically prevents freezing pipes, making it suitable for all climates.
- Measures 13.5 x 13.5 x 14.2 inches and weighs 32 pounds, fitting into most RV water heater compartments with minimal modifications.
The unit slides into the space of most existing RV water heaters. If adjustments are necessary, the opening can be expanded by cutting siding and the original wooden frame. For best results, consult a local RV shop if unsure about the installation process.
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The PrecisionTemp RV-550 Tankless Water Heater stands out as the best choice for those who live in their camper full-time or spend significant time in it. With its high BTU rating, built-in freeze protection, and efficient performance, this is the ultimate upgrade for hot water on demand.
PROS
- 55,000 BTU
- Anti-Freeze Protection
- High Propane Efficiency
- Wall Vented
- Easy Install (Direct Replacement For Standard RV Water Heater)
CONS
- Heavy
- Hard To Adjust Water Temperature On
How To Install An RV Tankless Water Heater
Down below is a great video showing you how to install the PrecisionTemp RV-550 in an RV if you also have to expand the water heater area.
Conclusion & Recommendations For Best RV Tankless Water Heater
What’s better than endless hot showers? For me, that’s the best part of tankless, or “on-demand,” water heaters. With access to 12V power (or batteries for some units), a water pump, propane gas, and water, you can enjoy consistent hot water for as long as you need.
RV tankless water heaters have been around for years, and they’re continually improving in efficiency and performance. The ability to have endless hot showers in an RV is a game-changer and a feature worth investing in.
Based on this review, here are my top recommendations for RV tankless water heaters:
Best Outdoor Tankless Water Heater – Camplux Pro 6L Portable Tankless Water Heater
Camplux gives you several portable tankless water heaters to choose from depending on what you need.
They’re very portable and versatile products that come with a shower head and gas regulator to get you started.
The 6L version is a fantastic product that has proven itself worthy of being brought on a camping trip. You can either install it on the outside of your camper or van or just bring it along in the back of a truck or the trunk of a car.
All you need to get hot water is a propane tank, a 12V water pump (many can be powered with a car battery), and water.
Most Portable Tankless Water Heater – Hike Crew Portable Propane Water Heater
The Hike Crew portable propane tankless water heater is one of a kind with everything you need built into one easy to transport unit.
You get the pump and heater all in one and you can even use it with a 1 lb propane tank which makes it even smaller and easy to transport.
On top of the portability, you get some great accessories that include a showerhead and hose as well as a tap you can use to get hot water for washing hands or dishes.
Other companies have tried to make this same all-in-one concept work but so far Hike Crew has the portable tankless water heater and water pump combo with the highest water temperature raise and burner.
Best Tankless Hot Water Heater For RV Use – PrecisionTemp RV-550 Tankless Water Heater
The PrecisionTemp RV-550 is the best option for replacing a standard camper water heater with an on demand one.
It’s also very high quality and will keep everybody happy, especially those who don’t want to have to wait to get hot water for a shower.
Endless hot (really hot) water, propane saving features, anti-freeze for cold winter camping use, 55,000 BTU, and easily installed in the RV.
There are not a lot of features missing on this beast and I feel confident recommending it to RVers, cabin-owners, and tiny house owners.
Frequently Asked Questions About RV Tankless Water Heaters
What is the downside of an RV tankless water heater?
The primary downside of an RV tankless water heater is that it requires water to flow through the unit before it produces hot water. This can lead to some water being wasted while waiting for the desired temperature, which isn’t a concern for RVers at campgrounds with unlimited water access but can be problematic for boondockers or dry campers trying to conserve water.
For those who frequently stay at campgrounds or RV parks where refilling freshwater tanks is convenient, tankless water heaters are a great option. However, for water-saving campers, careful planning or alternative solutions may be needed to minimize waste.
What are the biggest reasons to get an RV tankless water heater?
The biggest reasons to get an RV tankless water heater include saving space and weight, enjoying unlimited hot water, and improving propane efficiency.
For those living in RVs, mobile homes, or even traditional homes, space is a major advantage. Tankless water heaters are significantly smaller and lighter than traditional water heaters, freeing up valuable room.
For RVers, the appeal of unlimited hot water is hard to beat. When connected to city water, a tankless water heater allows you to enjoy long, consistent showers, offering a level of comfort similar to a regular home.
Propane tankless water heaters, often called on-demand systems, are more efficient. They only use propane when heating water, unlike traditional water heaters that burn propane continuously to maintain a tank of hot water, even when it’s not being used. This efficiency saves money and reduces waste.
Are RV tankless water heaters maintenance free?
RV tankless water heaters are not completely maintenance-free. Depending on your water quality and usage, they will require periodic flushing to ensure optimal performance.
If you use soft water, maintenance needs are minimal, and you might rarely need to flush the system. However, if you frequently use hard water (common at many RV parks), regular flushing is essential to prevent mineral buildup.
For easy maintenance, you can use a propane tankless water heater flush kit. I recommend flushing the unit at least once a year, especially if you use hard water or before storing your camper for winter.
Do RV tankless water heaters require water pumps to work?
RV tankless water heaters generally require a water pump unless the unit has one built in. Alternatively, connecting to a garden hose with sufficient water pressure can also make the water heater work without a pump.
To determine if you’ll need a pump, check the low-pressure activation requirement of the water heater. Most RV tankless water heaters work with low-pressure systems, like standard 12V RV water pumps, which are ideal for boondocking or off-grid camping.
Pay attention to the maximum pressure rating of the water heater. If your water source exceeds the heater’s maximum pressure, you may need a water pressure regulator.
Will I have instant hot water from the faucet if I get an RV tankless water heater?
While RV tankless water heaters heat water instantly at the unit, it takes a few seconds for the hot water to travel through your pipes to the faucet. The water already in your pipes cools between uses unless you have a circulation pump to maintain warmth.
However, not all tankless water heaters are compatible with circulation pumps, and using one may void your warranty. If having instant hot water at the faucet is essential, consult the manufacturer to ensure compatibility and warranty coverage before installing a circulation system.
Is it safe to drink water coming out of a camper’s tankless water heater?
It depends on the heater and the best thing to do is contact the manufacturer and ask about the specific model.
Can an RV tankless water heater freeze?
Yes, an RV tankless water heater can freeze, though many models come with built-in protections against cold temperatures. Indoor tankless water heaters are often rated to handle temperatures as low as -22°F, while outdoor models are typically rated to -4°F. However, wind chill can affect outdoor units, so it’s essential to shield them from direct wind exposure.
Always read the manual for your specific model to understand its cold-weather ratings and recommendations. Many manufacturers suggest draining the tankless water heater if extremely low temperatures are expected, even with freeze protection, to avoid damage.
Can an RV tankless water heater be installed outside?
Yes, some RV tankless water heaters are designed specifically for outdoor installation, while others are meant for indoor use or are versatile enough for both. It’s important to know the type you’re purchasing and where you plan to install it.
The first two water heaters reviewed in this article are outdoor models. These must be installed outside or require a vent pipe if installed inside to safely handle exhaust. Outdoor models are great for saving interior space and are often easier to install.
The last two reviewed are designed for indoor installation, making them suitable replacements for traditional 6-gallon RV water heaters. These are typically installed in the same location as the original unit.
Some models can work for both indoor and outdoor use, but always verify with the manufacturer’s specifications.
Will a propane tankless water heater work without power?
No, most propane tankless water heater won’t work without some power. While the propane provides the heat, a small amount of electricity is needed to regulate temperature, water flow, and ignition. Most models use an electric igniter rather than a pilot light, so power is essential for operation.
The water pump requires the most power. For camping and off-grid use, a 12V water pump is ideal, as it can be powered by your RV’s battery system. Ensure your setup includes a reliable 12V power source if you plan to use the water heater while camping or boondocking.
When do I clean an RV tankless water heater?
You should flush out and clean your tankless water heater at least once a year.
How do I clean a propane tankless water heater?
Cleaning a propane tankless water heater is a straightforward process but requires careful attention to detail. Here’s a general guide:
- Turn Off the Unit: Shut off the power and propane supply to the water heater for safety.
- Close Main Water Valves: Shut off the cold water inlet and hot water outlet valves to isolate the unit from the rest of the plumbing system.
- Open the Purge Port Valves: Use the purge valves to release any water remaining in the heater. Make sure the valves are connected to hoses that direct the water to a safe drainage area.
- Prepare a Cleaning Solution: Mix vinegar and water. Vinegar is safe and effective for cleaning as it removes mineral deposits without using harmful chemicals.
- Flush the System: Using a pump, circulate the vinegar solution through the water heater for about 45 minutes to an hour. This process removes scale buildup and ensures the heater operates efficiently.
- Rinse the System: Flush the system with clean water to remove any remaining vinegar.
- Close the Purge Ports and Reconnect: Securely close the purge valves, reconnect the water supply, and open the inlet and outlet valves.
- Restart the Unit: Turn on the propane and power, and test the system to ensure it’s functioning properly.
Always read the manual for your specific water heater, as cleaning procedures can vary slightly between models.
If you can’t find it, here’s a more detailed post about cleaning out a tankless water heater.
How does an RV tankless water heater work?
An RV tankless water heater works by heating water on demand as it flows through the unit. Inside, a pipe carries cold water past a gas or electric heating element, which rapidly warms the water.
Since only a small amount of water is heated at a time, the process is quick and efficient. Gas-powered models generally heat water faster than electric ones, though both can deliver consistent hot water.
Most RV tankless water heaters can provide 2–5 gallons of hot water per minute, enough to support one or two showers simultaneously. Unlike traditional water heaters, they never run out of hot water because they heat only the water being used.
For more information, check out this post.
Have any questions or comments about RV tankless water heaters? Leave a comment below.
Do you happen to have a pdf version of the install instructions for the Excel Tankless Gas Water Heater? It seems to be really difficult to find a version of it online.
Hello,
This is what I could find (click to view on Google Drive).
Jesse
All are great, thanks for providing such great options.