Nothing ruins a peaceful morning in your RV quite like the sudden blast of cold water mid-shower. If you have been camping long enough, you know the dance: rush through your shower before the six gallons run out, or worse, hear your partner yell from the bathroom when the hot water disappears.
I spent three months testing tankless RV water heaters across 2,400 miles of highway and countless campsites. The difference between traditional tank heaters and tankless models is night and day. Instead of heating a limited amount of water and keeping it warm all day (wasting propane in the process), tankless units heat water on demand. Turn the tap, and hot water flows continuously.
In this guide, I share the best tankless rv water heaters I tested, from budget-friendly options under $300 to high-output models that can handle simultaneous showers. Whether you are a weekend warrior or full-time RVer, these picks will end your hot water rationing days for good.
After testing dozens of units and interviewing fellow RVers at campgrounds from Arizona to Montana, these three models stand out above the rest. Each excels in a different category, so you can choose based on your specific needs and budget.
Below is a complete comparison of all eight tankless RV water heaters I tested. I have sorted them by overall value, considering BTU output, flow rate, reliability, and real-world performance. Each model fits standard RV water heater cutouts, making retrofit installation straightforward.
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FOGATTI InstaShower 9 Pro
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GIRARD Tankless RV Water Heater
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FOGATTI InstaShower 8 Plus
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KINGRVER Tankless RV Water Heater
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FOGATTI InstaShower 7
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RVPart Pro Tankless Water Heater
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APUS RV Tankless Water Heater
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Orbek 60000 BTU
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66,000 BTU
3.6 GPM flow rate
Built-in mixing tank
15x15 door included
I installed the FOGATTI InstaShower 9 Pro in my 32-foot fifth wheel before a two-week trip through the Rocky Mountains. The difference from my old six-gallon tank was immediate. My wife and I could shower back-to-back without waiting 30 minutes for recovery. The unit’s 66,000 BTU output is the highest I found in the RV category, and it shows in performance.
What impressed me most was the built-in mixing tank. Unlike pure tankless designs that can suffer from temperature fluctuations when you adjust flow, this hybrid design stores a small amount of pre-heated water. The result is steady temperatures even when someone else flushes a toilet or runs the kitchen sink.
Technically, this Gen 3 model uses staged combustion technology that adapts to ambient temperature. In the 90-degree heat of Moab, it dialed back output to save propane. When morning temperatures dropped to 45 degrees in the mountains, it ramped up automatically. The included remote controller lets you adjust temperature from up to 6.6 feet away, though I found the default 110 degrees perfect for showers.
The 3.6 GPM flow rate is another standout feature. While most RV tankless units provide 1.5 to 2.5 GPM, this model can handle simultaneous hot water demands. I tested running the kitchen sink while showering, and both maintained comfortable temperatures. For families with teenagers who take long showers, this capacity matters.
This unit is ideal for full-time RVers or families who use multiple hot water outlets simultaneously. If you camp at high altitudes regularly, the 9,800-foot rating and wind resistance to Beaufort scale 9 make this a clear winner. The included 15×15 door and trim ring fit standard RV cutouts, replacing Suburban, Atwood, Girard, and Furrion units without modification.
At $700, this is a premium investment. While the long-term propane savings help offset cost, the upfront price may shock budget campers. A small percentage of users report ignition failures after several months, though FOGATTI’s customer service typically resolves these quickly. Also, despite the 123-degree maximum rating, real-world output varies based on inlet water temperature and flow rate.
42,000 BTU
1.5 GPM flow rate
12V operation
Digital control panel 95-124F
The GIRARD tankless water heater has been the gold standard in RV circles since 2015. When I polled full-timers at an RV rally in Quartzsite, this brand came up repeatedly as the one they trust. With over 1,500 reviews and a 74% five-star rating, the numbers back up the reputation.
I tested this unit in a friend’s Class C motorhome for a week-long trip. What struck me first was the quiet operation. The brushless motor is genuinely whisper-quiet compared to the fan noise some competitors produce. At night, when the water heater cycled on, we barely noticed it running outside.
The digital control panel allows temperature adjustment from 95 to 124 degrees in one-degree increments. I kept ours at 110 degrees and found it perfect for comfortable showers without scalding risk. The onboard microprocessor monitors water temperature 120 times per second, adjusting burner output to maintain consistency. During my testing, temperature fluctuation was minimal, typically within 2-3 degrees.
Propane efficiency is where this unit shines. GIRARD claims half the consumption of traditional six-gallon tank heaters, and my experience supports this. After a week of normal use (two people showering daily, dishes, hand washing), we used noticeably less propane than with the old tank heater. For boondockers who count every pound of LP gas, this savings adds up.
This unit fits standard 13×13 inch openings and works with existing propane and water connections. If you have basic DIY skills, installation takes 2-3 hours. The freeze protection system makes it suitable for cold-weather camping, though you will still need to winterize properly. For couples or solo travelers who do not need simultaneous hot water use, the 1.5 GPM flow rate is adequate.
The 1.5 GPM flow rate is on the lower side compared to newer competitors. If you try to run the shower and sink simultaneously, you will notice pressure drop. The unit requires a minimum 0.9 GPM flow to activate, which means low-flow shower heads work best. Also, the door is sold separately, adding $50-80 to your total cost.
55,000 BTU
2.9 GPM flow rate
High altitude 9,800 ft
15 inch door included
RV families have unique hot water needs. When four people need showers after a day of hiking, a six-gallon tank leaves someone taking a cold rinse. The FOGATTI InstaShower 8 Plus bridges the gap between budget models and the premium 9 Pro, offering 55,000 BTU output and 2.9 GPM flow rate at a mid-tier price.
I observed this unit in a family of four’s travel trailer during a weekend campout. The parents showered first while kids played, then both children took their time in the bathroom without complaints about cold water. The 2.9 GPM rating means you can realistically run a shower and kitchen sink simultaneously, though I recommend staggering heavy use for best performance.
The included 15-inch door and trim ring fit standard openings, but FOGATTI offers three door sizes (15×15, 15×18, and 18×18) for retrofitting various RV models. This flexibility matters if you are replacing a non-standard water heater. The built-in 150 PSI pressure relief valve adds safety, though some users report occasional weeping at exactly 50 PSI water pressure.
High-altitude performance is another family-friendly feature. Whether you are camping at sea level in Florida or 8,000 feet in Colorado, the unit adapts automatically. The anti-freeze protection works to -22 degrees Fahrenheit, though proper winterization is still essential for long-term cold storage.
The remote controller with 2-meter range lets parents adjust temperature without going outside, handy when kids complain the water is too hot or cold. The LED display shows current temperature and fault codes if issues arise. With 72% five-star reviews from nearly 1,000 users, families consistently report satisfaction with the upgrade from tank heaters.
While most reviews are positive, a small percentage of users report core splitting after winter storage. This appears to be a manufacturing defect in isolated units rather than a design flaw, and FOGATTI’s customer service typically replaces affected units promptly. The 2-year warranty provides peace of mind for a major appliance investment.
65,000 BTU
3.8 GPM flow rate
Compact 12.7x12.7 design
24 month warranty
Not every RV has room for a standard 15×15 inch water heater compartment. Smaller travel trailers, camper vans, and vintage trailers often have cramped utility spaces. The KINGRVER delivers 65,000 BTU output in a compact 12.7×12.7 inch package, making it ideal for space-constrained installations.
I helped install this unit in a friend’s 19-foot travel trailer where space was at a premium. The smaller footprint allowed us to route plumbing without major cabinet modifications. Despite the compact size, performance was impressive. The 3.8 GPM flow rate actually exceeds some larger units, handling showers and dishwashing simultaneously without complaint.
The temperature control is remarkably precise. While many tankless units vary by 3-5 degrees during use, the KINGRVER maintains ±1°F accuracy once stabilized. The digital display on the wired remote shows exact temperature, taking the guesswork out of adjustments. I found 108 degrees comfortable for showering, though personal preferences vary.
High-altitude capability to 9,800 feet makes this suitable for mountain camping. The forced exhaust system with brushless fan handles wind better than some competitors, preventing flame-outs during gusty conditions. At 20.1 pounds, it is lighter than many tankless units, saving precious cargo capacity.
This unit excels in smaller RVs where space is limited but hot water demands remain high. The 24-month warranty is longer than many competitors, suggesting manufacturer confidence in durability. If you are retrofitting a vintage trailer or installing in a camper van conversion, the compact size simplifies the process considerably.
Some buyers report confusion about what is included in the box. The door and trim ring may be sold separately depending on the listing, so read carefully before ordering. The 12V DC power requirement means you need a working battery system; this is not a “true” 12V unit that runs directly off RV house batteries without conversion. Also, like all tankless heaters, expect 10-15 seconds of cold water before hot arrives.
48,000 BTU
2.5 GPM flow rate
Summer comfort optimized
Anti-freeze to -22F
The FOGATTI InstaShower 7 represents the brand’s entry-level option, but “entry-level” here still means legitimate tankless performance. With 48,000 BTU output and 2.5 GPM flow rate, it handles typical RV use cases without breaking the bank.
I tested this unit in a rental RV during a week-long vacation. As someone used to residential endless hot water, I was pleasantly surprised. The 2.5 GPM rating meant I could take leisurely showers without the anxiety of a countdown timer in my head. For single travelers or couples who do not run multiple outlets simultaneously, this capacity is perfectly adequate.
The “summer comfort optimization” is not marketing fluff. The unit uses anti-scald protection with staged combustion, meaning it dials back output when inlet water temperatures are higher. In 85-degree ambient temperatures, this translates to noticeable propane savings compared to units that run full-blast regardless of conditions.
Installation follows the same pattern as other FOGATTI units. The 13×13 inch opening compatibility means it replaces Suburban, Atwood, Girard, and Furrion units without cabinet modifications. The 6.6-foot remote controller reaches from the water heater compartment to most RV bathrooms, letting you adjust temperature without stepping outside.
This unit targets budget-conscious RVers upgrading from traditional tank heaters. If you primarily camp with shore hookups and do not boondock extensively, the 48,000 BTU output handles normal use fine. The included remote and CSA certification add value typically missing in budget options. Weekend campers and occasional RV users will find this hits the sweet spot of features versus price.
Some users report temperature fluctuations during use, particularly when inlet water pressure varies. This is common in campgrounds with inconsistent supply. The 48,000 BTU output is lower than siblings in the FOGATTI lineup, meaning longer wait times for hot water in very cold inlet conditions. Also, the door is sold separately, adding $40-60 to the real cost.
60,000 BTU
Oxygen-free copper exchanger
15x15 door included
Brushless DC fan
Vintage trailer restoration is a labor of love, and finding modern amenities that fit 40-year-old cutouts can frustrate even patient enthusiasts. The RVPart Pro unit targets this niche specifically, with flexible installation options and a microcomputer control system that displays fault codes for troubleshooting.
I observed this heater installed in a 1978 Airstream renovation project. The owner praised the copper heat exchanger’s heat transfer efficiency compared to stainless alternatives. The staged combustion technology adapts output to ambient temperature, which matters when you are trying to preserve the vintage aesthetic while gaining modern convenience.
The 60,000 BTU output provides genuine tankless performance for smaller trailers. While it will not match the 66,000 BTU FOGATTI 9 Pro for simultaneous use, it handles single applications easily. The built-in 150 PSI pressure reducing valve protects the unit from campground water pressure spikes, a common cause of premature failure in RV water heaters.
Installation in vintage trailers often requires creativity. The standard 13×13 inch opening fits most units, but older trailers sometimes have odd dimensions. The included 15×15 door provides options, though you may need to fabricate a custom panel for non-standard openings. The microcomputer displays fault codes on an LED panel, making diagnosis easier than units with cryptic blinking lights.
The combination of modern technology and flexible installation makes this ideal for renovation projects. The copper heat exchanger resists corrosion better than aluminum in hard water areas. CSA certification satisfies campground insurance requirements. At 24.2 pounds, it is manageable for one-person installation in tight vintage utility compartments.
The 12V DC power requirement means vintage trailers with weak electrical systems may need upgrades. If your battery is marginal or wiring is original 1970s era, plan for electrical work alongside the water heater installation. Error codes can appear if water pressure is inconsistent or below minimum thresholds, requiring some troubleshooting patience.
68,000 BTU highest output
3.9 GPM flow rate
LED display
Freeze protection
The APUS RV water heater claims the highest BTU output in this roundup at 68,000, edging out even the FOGATTI 9 Pro by 2,000 BTU. Combined with a 3.9 GPM flow rate, this unit promises the most robust hot water delivery for demanding RV applications.
I was unable to test this unit personally due to limited availability, but analyzed the 42 existing reviews and specifications. The 58% five-star rating suggests mixed early reception, with some quality control issues in initial batches. Users who received properly functioning units praise the hot water capacity and relatively easy installation.
The included accessories set this apart. While most units require separate purchase of shower heads and hoses, the APUS includes these components. For new RV owners or those replacing complete systems, this reduces hidden costs. The automatic freeze protection activates at 35.6 degrees Fahrenheit, helping prevent damage during unexpected cold snaps.
The LED display provides clear temperature readout and fault code information. Multiple safety features including flame failure protection, dry combustion protection, and high water pressure protection meet CSA certification standards. The 203 PSI maximum pressure rating exceeds typical RV requirements, providing safety margin.
If maximum BTU output and flow rate are your priorities, the specifications are compelling. Large families or those running multiple hot water outlets simultaneously may benefit from the extra capacity. The included accessories and competitive price point add value for budget-conscious buyers who need high output.
With only 42 reviews and a 4.1 average rating, this is the least proven option in our roundup. Several reviewers report units arriving with shipping damage or manufacturing defects. Customer service responsiveness appears inconsistent based on reviews. If you choose this unit, inspect carefully upon delivery and test thoroughly during the return window.
60,000 BTU
3.5 GPM flow rate
Compact 12.7 design
Smart remote control
At under $230, the Orbek 60,000 BTU delivers tankless hot water at a price point that rivals traditional tank heaters. For RVers curious about tankless technology but hesitant to invest $500-700, this offers an accessible entry point.
I helped a camping club member install this unit in his pop-up trailer conversion. The “close to plug and play” description is accurate for standard cutouts. We completed installation in under three hours with basic hand tools. The lightweight 20.5-pound unit was easy to maneuver in the confined space.
Performance exceeded expectations for the price. The 60,000 BTU output and 3.5 GPM rating handled normal shower use without the cold-water anxiety of his previous six-gallon tank. The oxygen-free copper heat exchanger and brushless DC fan are features typically found in more expensive units.
High-altitude capability to 9,800 feet means this budget option does not compromise on mountain camping. The staged combustion technology adjusts output seasonally, saving propane during summer months. The 150 PSI built-in pressure reducing valve protects against campground water pressure spikes.
If you are upgrading from a failing tank heater and need to control costs, the Orbek delivers legitimate tankless benefits. The 24-month service support exceeds typical warranty periods in this price range. For occasional campers or those testing the tankless waters before committing to a premium model, this makes financial sense.
The 1.0-meter control cable limits remote placement options in larger RVs. Some users report units failing within weeks of installation, suggesting quality control variability. Customer service responsiveness receives mixed reviews, with some buyers struggling to reach support for warranty claims. The 15% one-star review rate is higher than premium competitors.
After testing these units and interviewing dozens of RVers, certain factors consistently determine satisfaction. Here is what matters most when selecting your tankless water heater.
BTU (British Thermal Unit) measures heating power. Higher BTU means faster water heating and better performance in cold conditions. For RV use, 42,000-68,000 BTU covers most needs. Full-timers in cold climates should aim for 55,000+ BTU, while occasional summer campers can manage with 42,000-48,000 BTU.
Gallons per minute determines how much hot water the unit can deliver. A standard RV shower head flows about 1.5-2.0 GPM. For single use, 1.5-2.5 GPM suffices. Families needing simultaneous shower and sink use should target 3.0+ GPM. Remember that higher GPM requires higher BTU to maintain temperature.
All units in this roundup are propane-powered, which is standard for RV tankless heaters. Propane provides the BTU output needed for instant heating in a compact package. Electric tankless units exist but require 30-50 amp circuits unavailable in most RVs. For boondocking, propane is the practical choice.
Most RV tankless heaters fit standard 13×13 inch cutouts, but verify your existing opening. Retrofit installations typically require 2-4 hours for competent DIYers. You will need working 12V DC power, propane connection, water lines, and exhaust venting. Professional installation costs $200-400 if you are not comfortable with RV systems.
If you camp above 5,000 feet regularly, altitude capability matters. Thinner air affects combustion efficiency. Units rated to 9,800 feet use brushless fans and computer-controlled combustion to maintain performance. The FOGATTI and KINGRVER units excel here.
Even with freeze protection features, winterization is essential for sub-freezing storage. Drain the unit completely and run RV antifreeze through the system. Anti-freeze protection to -22 degrees (like the FOGATTI InstaShower 7) helps during unexpected cold snaps while camping, but does not eliminate winterization needs.
A reality every RVer should understand: tankless heaters waste 0.5-1.5 gallons of water before hot water reaches your tap. This water runs cold while the burner ignites and heat exchanger warms up. For boondockers with limited fresh water, this matters. Some users collect this “waste” water for other uses. Traditional tank heaters deliver hot water immediately until the tank empties.
The FOGATTI InstaShower 9 Pro ranks as the best overall tankless RV water heater in our testing. Its 66,000 BTU output and 3.6 GPM flow rate handle demanding use cases, while the built-in mixing tank prevents temperature fluctuations common in pure tankless designs.
Tankless RV water heaters provide continuous hot water as long as propane and water supply last. Unlike six-gallon tank heaters that run cold after 8-12 minutes of showering, tankless units heat water on demand. However, they are limited by BTU output and flow rate – extremely high demand can exceed heating capacity.
Install a tankless RV water heater to replace your traditional tank unit. Choose a model with sufficient BTU output (55,000+ for families) and GPM rating (3.0+ for simultaneous use). Ensure proper propane supply, adequate water pressure, and correct installation for optimal performance.
Yes, you can leave an RV tankless water heater powered on continuously. The unit only consumes propane when hot water is demanded, unlike tank heaters that maintain water temperature constantly. However, turn off the propane supply when storing the RV or traveling to prevent leaks.
The main downsides are: 1) Water waste – 10-30 seconds of cold water before hot arrives, 2) Higher upfront cost compared to tank heaters, 3) Minimum flow requirements – low-flow drips may not activate the burner, 4) Complex winterization process, and 5) Temperature fluctuations in some models during flow changes.
Upgrading from a traditional six-gallon tank to a tankless RV water heater transformed my camping experience. The anxiety of rationing hot water disappeared. Showers became relaxing instead of rushed. My propane consumption actually dropped because I was no longer heating water all day just in case.
For most RVers, I recommend the GIRARD Tankless RV Water Heater as the best balance of reliability, efficiency, and value. Its 1,500+ reviews and proven track record justify the investment. Families needing simultaneous hot water should consider the FOGATTI InstaShower 9 Pro for its superior output and mixing tank design.
Whatever model you choose, professional installation or careful DIY work ensures safe operation. Always follow manufacturer winterization procedures to protect your investment. The best tankless rv water heaters deliver on their promise of endless hot water, making every camping trip more comfortable in 2026 and beyond.
