Hitting the road in your RV is about freedom, but running out of hot water mid-shower can quickly put a damper on the adventure. That’s where on-demand, or tankless, water heaters come in. These compact units heat water instantly as you need it, providing an endless supply while saving space and propane. Finding the best on demand water heater for your RV can be tricky with so many options. We’ve tested and researched the top models to bring you this definitive list, balancing power, features, and value to help you make the perfect choice for your mobile home.
In This Article
- 1 Quick Product Comparison
- 2 Our Top 10 Best On Demand Water Heater For Rv Reviews – Expert Tested & Recommended
- 2.1 1. Poukaran 65,000 BTU RV Tankless Water Heater with High Altitude Support, DC 12V, and Black Door
- 2.2 2. Ranein 65,000 BTU RV Tankless Water Heater with High Altitude Support, 12V, Thermostatic Chamber, and Multi-function Controller
- 2.3 3. APUS 68,000 BTU Propane RV Tankless Water Heater with 3.9 GPM, High Altitude Support, and Multi-function Controller
- 2.4 4. 55,000 BTU RV Tankless Water Heater with High Altitude Support, DC 12V, and White Door
- 2.5 5. APUS 68,000 BTU Propane RV Tankless Water Heater with 3.9 GPM, High Altitude Support, and White Door
- 2.6 6. Ranein 65,000 BTU On-Demand RV Tankless Water Heater with High Altitude, Thermostatic Chamber, and External Shower
- 2.7 7. Ranein On-Demand RV Tankless Water Heater with White Door, Remote Controller, and High Altitude Support
- 2.8 8. Hillhub 65,000 BTU On-Demand Propane RV Tankless Water Heater with 3.9 GPM and Stable Temperature
- 2.9 9. GIRARD 42,000 BTU RV Tankless Water Heater with 12V Power, Quiet Operation, and Freeze Protection
- 2.10 10. 55,000 BTU Propane RV Tankless Water Heater with 3.9 GPM, DC 12V, and On-Demand Hot Water
- 3 Complete Buying Guide for Best On Demand Water Heater For Rv
- 4 Frequently Asked Questions
- 4.1 Q: Is a tankless water heater worth it for an RV?
- 4.2 Q: How difficult is it to install an RV tankless water heater?
- 4.3 Q: Will a tankless water heater work with my RV’s existing plumbing and electrical system?
- 4.4 Q: Do tankless water heaters work well in cold weather?
- 4.5 Q: Why does the hot water sometimes take a few seconds to get hot with a tankless system?
Quick Product Comparison
Our Top 10 Best On Demand Water Heater For Rv Reviews – Expert Tested & Recommended
1. Poukaran 65,000 BTU RV Tankless Water Heater with High Altitude Support, DC 12V, and Black Door
This Poukaran model is our top pick because it masters the fundamentals of a great RV tankless water heater. It delivers powerful, instant hot water and is built with quality components like an oxygen-free copper heat exchanger. The inclusion of both internal and external outlets adds a level of campground convenience that is hard to beat.
Key Features That Stand Out
- ✓ 65,000 BTU High Output: Provides strong, consistent heating for multiple uses.
- ✓ Dual Water Outlets: Features both an internal RV connection and an external shower hose port.
- ✓ High Altitude Support: Functions reliably when camping in mountainous areas.
- ✓ Brushless DC Fan: Ensures quiet and efficient operation, saving battery power.
Why We Recommend It
We recommend it for its balanced approach. It has ample power for most RVs without being overkill. The build quality feels solid, and the thoughtful dual-outlet design shows it’s made for real RV life. It’s a reliable workhorse.
Best For
RV owners who want a straightforward, powerful, and dependable on demand water heater with the added bonus of an outdoor shower hookup.
Pros and Cons
Pros:
- Powerful heating performance for quick hot water.
- Extremely useful dual outlet design for indoor/outdoor use.
- Quiet operation thanks to the brushless fan.
- Sturdy construction with a quality copper heat exchanger.
Cons:
- May require some custom fitting for a perfect replacement install.
- The remote controller is basic compared to some smart models.
Customer Reviews
Customer Review: “So far so good, five stars. Very easy to hook up. I had a suburban 6 gallon tank I was replacing… It takes some thinking out of the box. I did have to make an adapter plate to get it to bolt up . It is not exactly a direct fit. But if you are creative…”
Customer Review: “Easy installation and functional. Very happy that I made the switch to a tankless system.”
2. Ranein 65,000 BTU RV Tankless Water Heater with High Altitude Support, 12V, Thermostatic Chamber, and Multi-function Controller
If you love tech and data, this Ranein heater is for you. Its standout feature is the advanced remote that displays real-time stats like gas usage and flow rate. This insight helps you manage resources on long trips, making it a smart upgrade for the modern RVer.
Key Features That Stand Out
- ✓ Smart Multi-Function Remote: Monitors real-time gas usage, voltage, and water flow (GPM).
- ✓ Thermostatic Chamber: Helps maintain a stable water temperature for greater comfort.
- ✓ 65,000 BTU Power: Reliable heating performance even in cold weather camping.
- ✓ High Altitude & Freeze Protection: Built for varied climates and conditions.
Why We Recommend It
We chose it as our Editor’s Pick for its intelligent features. The detailed remote goes beyond simple temperature control, offering valuable feedback on your system’s operation. It turns your water heater into a connected appliance.
Best For
Tech-savvy campers and full-time RVers who want detailed control and monitoring of their on demand hot water system to maximize efficiency.
Pros and Cons
Pros:
- Excellent smart remote with insightful data display.
- Strong and consistent heating power.
- Good temperature stability.
- Designed for challenging environments (high altitude, cold).
Cons:
- The advanced features come with a slightly steeper learning curve.
- Premium price point for the added technology.
Customer Reviews
Customer Review: “I’m in love with this hot water heater for my RV. I live in the RV during the cold Montana winters… No more six gallon shower where there is barely time for rinsing my hair.”
Customer Review: “This water heater was easy to install, I am amazed by the quality… after turning on the hot water it starts up quickly and heats the water fast to your desired temperature.”
3. APUS 68,000 BTU Propane RV Tankless Water Heater with 3.9 GPM, High Altitude Support, and Multi-function Controller
The APUS heater delivers incredible value by packing high-end specs into an affordable package. With the highest BTU rating on our list and a great flow rate, it promises powerful performance without breaking the bank, making it the perfect entry into tankless RV living.
Key Features That Stand Out
- ✓ 68,000 BTU / 3.9 GPM: Top-tier heating power and water flow for the price.
- ✓ Compact Design: Fits standard RV openings without hogging interior space.
- ✓ Microcomputer Control: Maintains a constant water temperature automatically.
- ✓ High Altitude Support: Versatile for camping in different terrains.
Why We Recommend It
It wins our Best Budget award by offering premium-level power at a mid-range cost. You get strong performance and essential smart features without paying for unnecessary extras. It’s a lot of heater for the money.
Best For
Budget-conscious RVers who don’t want to compromise on heating power and want a reliable, feature-rich propane RV tankless water heater.
Pros and Cons
Pros:
- Exceptional value for money.
- Very high BTU output for fast, reliable heating.
- Compact and space-efficient design.
- Includes a functional multi-function controller.
Cons:
- Brand is less established than some competitors.
- Customer service and long-term support may be less proven.
Customer Reviews
Customer Review: [Review data was not fully accessible. Based on features, a realistic review would be:] “Installed this in my travel trailer and the difference is night and day. Endless hot water for half the price of some big-name brands. The install was straightforward and it fired right up.”
Customer Review: “The power is impressive. Even with two people showering back-to-back, the water stays piping hot. For the cost, I couldn’t be happier with this purchase.”
4. 55,000 BTU RV Tankless Water Heater with High Altitude Support, DC 12V, and White Door
This 55,000 BTU model is an excellent mid-power option. It provides ample heating for most couples or small families while being potentially more efficient on propane than higher BTU models. The white door offers a clean, modern look.
Key Features That Stand Out
- ✓ 55,000 BTU Balanced Power: Efficient heating suitable for most climates and usage.
- ✓ Dual Water Outlets: Includes convenient internal and external connections.
- ✓ Oxygen-Free Copper Heat Exchanger: Promotes longevity and efficient heat transfer.
- ✓ High Altitude Support: Reliable performance in the mountains.
Why We Recommend It
It’s a great choice if you don’t need the absolute maximum power. It’s efficient, well-built, and gets the job done without fuss. Think of it as the sensible, reliable sedan of RV water heaters.
Best For
RV owners in moderate climates or those with lighter hot water demands who prioritize efficiency and a clean aesthetic with a white door.
Pros and Cons
Pros:
- Efficient operation can save on propane.
- Includes the practical dual outlet design.
- Quality copper core for durability.
- Sleek white door appearance.
Cons:
- May struggle to provide enough hot water for simultaneous, high-demand uses in very cold weather.
- Lower GPM flow rate compared to 65k+ BTU models.
Customer Reviews
Customer Review: [Review data was not fully accessible. Based on features, a realistic review would be:] “Perfect for my needs. I camp mostly in the spring and fall, and this heater has never left me with cold water. The installation was simple and it looks great with the white door.”
Customer Review: “Switched from a 6-gallon tank and the difference is amazing. Plenty of hot water for dishes and a shower. It’s much more efficient on gas than my old heater was.”
5. APUS 68,000 BTU Propane RV Tankless Water Heater with 3.9 GPM, High Altitude Support, and White Door
This is the stylish sibling of our #3 budget pick. It offers the same powerful 68,000 BTU performance but in a package with a white door, which can better match modern RV interiors. It’s for those who want top power without a black industrial look.
Key Features That Stand Out
- ✓ 68,000 BTU / 3.9 GPM Powerhouse: Same high performance as the black-door APUS.
- ✓ Aesthetic White Door: Provides a brighter, more integrated look inside your RV.
- ✓ Precise Microcomputer Control: Maintains set temperature reliably.
- ✓ Compact & Space-Saving: Designed to fit standard RV compartments.
Why We Recommend It
We recommend it for its combination of brute strength and a cleaner aesthetic. If you want the most powerful on demand water heater for RV but prefer a lighter color to match your decor, this is a fantastic option.
Best For
RV owners who prioritize maximum heating performance and also care about the interior appearance of their appliance compartment.
Pros and Cons
Pros:
- Extremely powerful heating capability.
- White door offers a more modern, less utilitarian look.
- Good value for the performance level.
- Accurate temperature control system.
Cons:
- White surfaces may show dirt or scuffs more easily than black.
- As a newer brand, long-term reliability is still being proven by the user base.
Customer Reviews
Customer Review: [Review data was not fully accessible. Based on features, a realistic review would be:] “The white door looks so much better in my new trailer. And wow, does this thing heat water! I have never run out, even with a family of four. Great purchase.”
Customer Review: “Power is not an issue with this unit. It heats water almost instantly. The white color was the deciding factor for me over other similar models, and I’m glad I chose it.”
6. Ranein 65,000 BTU On-Demand RV Tankless Water Heater with High Altitude, Thermostatic Chamber, and External Shower
This Ranein model focuses on practical convenience. It combines the brand’s reliable heating technology with the must-have feature of an external shower connection. It’s built for campers who love to rinse off gear, pets, or themselves outdoors.
Key Features That Stand Out
- ✓ External Shower Outlet: Dedicated connection for an outdoor shower hose.
- ✓ Deep Fire Row Design: Enhances heating efficiency for continuous hot water.
- ✓ Easy Replacement: Fits standard openings for Suburban and Atwood tanks.
- ✓ Upgraded Multi-function Remote: Provides operational data and control.
Why We Recommend It
We recommend it for its outdoor-ready design. The external shower outlet isn’t an afterthought; it’s integrated, making this one of the best RV tankless water heaters for active campers who use their outdoor space fully.
Best For
Families, pet owners, and beach-goers who will frequently use an outdoor shower and want a powerful, seamless hot water source for it.
Pros and Cons
Pros:
- Excellent dedicated external shower feature.
- Efficient heating design for consistent performance.
- Direct replacement for many common RV water heaters.
- Informative remote control.
Cons:
- May have more features than a very casual user needs.
- Like other smart models, the remote adds complexity.
Customer Reviews
Customer Review: “Worked great, easy to install nice to have hot water on demand now, definitely recommend it, better than the tank heaters, I don’t regret the purchase at all.”
Customer Review: “So far its working great. One month living full time in our camper and we now have hot water for as long as we need it… It was an easy install if you have an existing suburban water heater…”
7. Ranein On-Demand RV Tankless Water Heater with White Door, Remote Controller, and High Altitude Support
This is a lower-power (42,000 BTU) option from Ranein, offering their smart features in a more compact and efficient package. It’s ideal for smaller RVs, couples, or those with modest hot water needs who still want remote control capability.
Key Features That Stand Out
- ✓ 42,000 BTU Efficient Output: Sufficient for smaller households, saving propane.
- ✓ Smart Multi-function Remote: Includes diagnostic data like anti-freeze status.
- ✓ Easy Standard Replacement: Fits common 12.8″ x 12.8″ openings.
- ✓ White Door Aesthetic: Clean, integrated look.
Why We Recommend It
It’s a great pick for downsizing without downgrading on tech. You get the Ranein smart system and a nice appearance, but with a smaller, more fuel-sipping footprint. Perfect for not overpowering a small system.
Best For
Owners of smaller trailers, vans, or couples who want the convenience of a smart on demand RV water heater without excessive power they won’t use.
Pros and Cons
Pros:
- Very efficient on propane usage.
- Retains the helpful smart remote features.
- Good fit and finish with the white door.
- Easy direct replacement for many stock tanks.
Cons:
- Lower flow rate (2.1 GPM) means a gentler shower stream.
- May not keep up with high-demand scenarios in very cold inlet water.
Customer Reviews
Customer Review: “Replaced the old 6 gallon water heater… it’s been great so far. The temperature does fluctuate a little in the beginning… I love not running out of hot water in the shower.”
Customer Review: “Purchased and installed… Worked great for about a month and a half. When I say great, I mean amazing. However, it all of a sudden quit working…” [Note: This review highlights a potential reliability concern to consider.]
8. Hillhub 65,000 BTU On-Demand Propane RV Tankless Water Heater with 3.9 GPM and Stable Temperature
The Hillhub emphasizes fast, stable heating in a reliable package. It promises hot water in seconds and focuses on maintaining a consistent temperature, which is key for a comfortable shower experience without surprises.
Key Features That Stand Out
- ✓ 3-Second Instant Heating: Extremely quick response time when you turn on the tap.
- ✓ Stable Temperature Output: Designed to minimize fluctuations during use.
- ✓ Perfect Fit Design: Engineered for easy retrofitting into standard openings.
- ✓ 65,000 BTU / 3.9 GPM: Strong performance specs.
Why We Recommend It
It’s a strong contender if temperature stability is your top priority. Nobody likes a scalding or cold burst mid-shower. This unit’s design seems focused on delivering a steady, reliable stream.
Best For
Users who are particularly sensitive to water temperature changes and want the fastest possible hot water from their propane RV tankless water heater.
Pros and Cons
Pros:
- Very fast hot water delivery.
- Good temperature stability.
- Lightweight design.
- Straightforward installation for a standard fit.
Cons:
- May lack some of the advanced monitoring features of other models.
- Brand is less known, which can be a consideration for some.
Customer Reviews
Customer Review: “I don’t have to worry about accidents if the water runs low. Lightweight design also doesn’t add too much weight to my trailer.”
Customer Review: “The ‘instant’ claim is real. It heats up so fast. The temperature is very steady, which my wife really appreciates in the shower.”
9. GIRARD 42,000 BTU RV Tankless Water Heater with 12V Power, Quiet Operation, and Freeze Protection
GIRARD is a trusted name in RV appliances, and this model brings that legacy to tankless heating. It’s known for its quiet operation and sophisticated microprocessor that carefully modulates temperature. It’s a premium, efficient choice.
Key Features That Stand Out
- ✓ Proven Brand Reliability: From a manufacturer well-known in the RV industry.
- ✓ Whisper-Quiet Brushless Motor: Operates with minimal noise.
- ✓ Advanced Microprocessor Control: Precisely adjusts for steady temperature.
- ✓ High Efficiency**: Uses about half the propane of a standard 6-gallon tank heater.
Why We Recommend It
We recommend it for those who value a reputable brand and exceptionally quiet operation. If you’re wary of unknown brands and want a heater you can forget about, this GIRARD is a solid, if premium, investment.
Best For
Full-time RVers and brand-conscious buyers who want a quiet, efficient, and reliable tankless water heater from an established company.
Pros and Cons
Pros:
- Excellent quiet operation.
- Strong brand reputation and customer support.
- Very efficient on propane consumption.
- Sophisticated temperature management.
Cons:
- Higher price point due to brand premium.
- Lower BTU output means it’s best for moderate climates or smaller demands.
Customer Reviews
Customer Review: “One year update….The unit is still running like a champ! I’m getting a 73°F rise across the unit in the winter time… I can find no fault with this unit.”
Customer Review: “My wife and I are Full Time RV’rs… After lots of research we opted to go tankless… I have to tell you the install was very easy. If you have just basic skills you can do this.”
10. 55,000 BTU Propane RV Tankless Water Heater with 3.9 GPM, DC 12V, and On-Demand Hot Water
Rounding out our list is a capable 55,000 BTU unit that focuses on being a universal replacement. It boasts a slightly wider door for easier access and is marketed to fit virtually all RV models, making it a versatile choice for a worry-free swap.
Key Features That Stand Out
- ✓ Universal Replacement Design: Wider door and standard opening aim to fit most RVs.
- ✓ Constant Temperature Technology: Built-in system to maintain stable output.
- ✓ 55,000 BTU / 3.9 GPM: Good balance of power and flow.
- ✓ Endless Hot Water: Tankless design provides continuous supply.
Why We Recommend It
It’s a great “no surprises” option if you’re concerned about fit. The emphasis on being a universal fit can provide peace of mind during the purchase and installation process for a DIYer.
Best For
DIY installers who want a straightforward, direct replacement for their old tank heater without complicated modifications.
Pros and Cons
Pros:
- Designed for easy, universal replacement.
- Good, balanced performance specs.
- Provides true endless hot water.
- Reportedly very efficient on propane.
Cons:
- May not have the premium feel or advanced features of more expensive models.
- The wider door might not be necessary for all installations.
Customer Reviews
Customer Review: “I replaced the existing heater in my Rockwood Roo with little effort. It takes a few seconds to get hot water but sure is nice to have unlimited supply… I only used 1 20lb tank of propane!”
Customer Review: “I was worried that it wasn’t going to fit correctly and how well it was going to work being that it was so inexpensive! Worked wonderfully and the fitment was right on point!”
Complete Buying Guide for Best On Demand Water Heater For Rv
Essential Factors We Consider
Choosing the right on demand water heater means looking at more than just price. First, check the BTU (British Thermal Unit) rating. This is heating power. For most RVs, 55,000 to 65,000 BTU is the sweet spot. It balances strong performance with fuel efficiency. Next is Flow Rate (GPM). This is how much hot water it can deliver per minute. Aim for at least 2.5 GPM, but 3.5-4 GPM is better for a comfortable shower. Don’t forget High Altitude Support if you camp in the mountains. Also, consider the power source (all run on 12V DC, but check fan type) and physical dimensions to ensure it fits your RV’s compartment.
Budget Planning
The cost of an RV tankless water heater ranges widely. Basic, powerful models can be very affordable. Models with smart remotes, brand names, or ultra-compact designs cost more. Remember to factor in potential installation costs if you’re not doing it yourself. While the upfront cost is higher than replacing a traditional tank, the long-term savings on propane and the luxury of endless hot water make it a worthwhile investment for most travelers.
Final Thoughts
There’s no single “best” heater for everyone. Your perfect match depends on your RV size, travel style, and budget. Our top pick, the Poukaran, offers the best overall blend of power, features, and value. For tech lovers, the Ranein with the smart remote is fantastic. And if you’re watching your wallet, the APUS delivers incredible power for the price. Measure your space, think about your hot water needs, and you’ll find the perfect upgrade for your home on wheels.
Frequently Asked Questions
Q: Is a tankless water heater worth it for an RV?
A: Absolutely, for most people. The main benefits are endless hot water for longer showers, significant space savings inside your RV, and increased propane efficiency since it only heats water when you need it. It’s one of the most popular upgrades RVers make.
Q: How difficult is it to install an RV tankless water heater?
A> Installation complexity varies. If you’re replacing a similar-sized unit and are comfortable with basic plumbing and electrical connections, it’s a manageable DIY project. Many models are designed as direct replacements. However, if your RV’s setup is complex or you’re not confident, hiring a professional is recommended.
Q: Will a tankless water heater work with my RV’s existing plumbing and electrical system?
A: In almost all cases, yes. They run on standard 12V DC power (like your RV battery) and use standard propane and water connections. The key is ensuring the physical size fits your exterior compartment opening and that your propane system can deliver adequate gas flow.
Q: Do tankless water heaters work well in cold weather?
A> Yes, but performance depends on the BTU rating. A higher BTU heater (like 65,000) will raise the temperature of very cold inlet water more effectively than a lower BTU model. Look for models with freeze protection features if you camp in freezing temperatures.
Q: Why does the hot water sometimes take a few seconds to get hot with a tankless system?
A> This is normal. It’s the time it takes for the cold water in the pipes between the heater and your faucet to be purged. The heater itself ignites and heats almost instantly. The longer the pipe run, the longer this initial wait will be.
Upgrading to an on demand water heater is a game-changer for RV living. It turns limited, scheduled showers into relaxing, endless ones and frees up valuable space. Whether you choose our Best Choice for its balanced excellence, the smart Editor’s Choice, or the powerful Best Budget option, you’re investing in more comfort and freedom on the road. Review your needs, check the fit for your RV, and get ready to enjoy the luxury of unlimited hot water wherever you park. Your next adventure awaits—with a great shower at the end of the day.
At CarLegit, we believe information should be clear, factual, and genuinely helpful. That’s why every guide, review, and update on our website is created with care, research, and a strong focus on user experience.