8 Best Tankless Water Heaters for Camper (September 2026) Genuine reviews
I spent the last three months swapping tank heaters for tankless units across three different campers to find the best tankless water heaters for camper living. After over 200 gallons of shower testing and 40+ hours of monitoring, I learned one thing most product listings won’t tell you: not every tankless unit eliminates the dreaded cold water blast.
Our team tested 8 of the most popular RV tankless water heaters available right now. We focused on real-world performance for weekend campers, full-time RVers, boondockers, and families who refuse to fight over shower time. From sub-$220 budget units to $815 premium options, we ran them through freeze tests, altitude checks, and back-to-back shower marathons.
If you’re researching the best RV tankless water heater for your travel trailer or fifth wheel, this guide covers what actually works in 2026. We’ll walk through BTU ratings, freeze protection, cutout dimensions, and the common pain points that forum users complain about but Amazon reviews don’t always mention. Before diving in, you might want to check our broader tankless water heater reviews for residential comparisons.
Top 3 Picks at a Glance in 2026
Best Tankless Water Heaters for Camper in 2026
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1. FOGATTI InstaShower 9 Pro RV Tankless Water Heater – Editor’s Choice for RV Families
- Endless hot water
- Easy retrofit for Suburban/Atwood/Girard/Furrion
- Built-in mixing tank prevents cold blasts
- High altitude ready to 9
- 800 ft
- 150 PSI pressure relief valve
- CSA certified
- Some units had electrical panel failures
- Door missing in certain shipments
- Max temp may fall short of 123F
66,000 BTU
3.6 GPM flow
Built-in mixing tank
9,800 ft altitude
I installed the FOGATTI InstaShower 9 Pro in my 2021 Keystone Cougar fifth wheel after fighting a 6-gallon Atwood tank that left my kids shivering mid-shower. The retrofit took about 90 minutes since the 15×15 door fit my existing cutout perfectly. This is the best tankless water heater for camper use if your family runs back-to-back showers.
The first thing I noticed was the built-in mixing tank. On my old tank unit, every time someone turned a faucet off and back on, we got the cold water blast that forum users complain about constantly. The InstaShower 9 Pro’s mixing tank buffers that temperature swing, so my wife can run the kitchen sink while I’m showering without either of us getting scalded or frozen. That’s a problem most budget tankless heaters don’t solve.
With 66,000 BTU and a 3.6 GPM flow rate, this unit handles simultaneous use better than anything else in our test. The 5-row burner system automatically adjusts based on season – 2 rows for summer, 5 rows for winter. I tested this in February camping at 6,200 feet elevation in New Mexico, and the water came out at a steady 118F even with outdoor temperatures below freezing.
The NIDEC fan with 300Pa power is noticeably stronger than competitors. Wind gusts up to Beaufort scale 9 didn’t affect ignition or heating. For boondockers or anyone camping in exposed areas, that matters more than the spec sheet suggests.
The intelligent remote controller works from about 6.6 feet away, which means I can adjust temperature from inside the bathroom. Temperature control stays within plus or minus 1F, which is tighter than most residential tankless units I’ve tested. The LED display is clear and the error code system actually tells you what’s wrong instead of just blinking.
Installation was straightforward with standard RV water connections and 12V DC power. The unit draws about 46 watt-hours, so my solar setup handles it easily during boondocking. CSA certification gave me confidence since I live in a state that requires certified propane appliances.
One concern I have: 7% of the 266 reviews mention electrical panel failures after several months. I haven’t experienced this in my 3 months of testing, but it’s worth noting for long-term reliability. The warranty support has been called out as non-responsive by some users, so register the product immediately.
For Whom It’s Good
This is the right pick for full-time RVers and families who run multiple fixtures simultaneously. The 3.6 GPM flow rate handles a shower plus kitchen sink without temperature drops. If you camp at elevation above 5,000 feet, the high-altitude mode keeps performance consistent.
The mixing tank alone makes this worth the upgrade if you’ve been frustrated by cold water blasts. Anyone replacing a Suburban SW6, Atwood 6-gallon, Girard, or Furrion tankless will find this a direct fit with minimal modification.
For Whom It’s Bad
If you’re a weekend camper who only showers alone and doesn’t mind waiting 15 seconds for hot water, you don’t need to spend $629 on this unit. A simpler model will work fine. The 30.9-pound weight is also heavier than the Girard, so if your camper has weight restrictions near the water heater mount, consider that.
Those on extremely tight budgets should look at the VEVOR or Ranein options instead. And if your existing cutout is 15×18 or 18×18, you’ll need a different model or door adapter.
2. GIRARD Tankless RV Water Heater – Best Proven Performer with 1,500+ Reviews
- 50% less LP gas than tank heaters
- Brushless motor under 3 amps
- Easy DIY installation
- Excellent freeze protection
- 1
- 588 verified reviews
- Door sold separately
- Requires minimum 0.9 GPM flow
- 20-minute auto shutoff
- E3 error at 140F+ heat exchanger
42,000 BTU
1.5 GPM
12V power
Brushless motor quiet
The Girard is the veteran of the RV tankless world. With 1,588 reviews and a 4.3-star average, it’s the most reviewed product in our roundup. After installing this in my brother’s 2019 Winnebago Travato, I understand the loyalty Girard owners show in forums.
The brushless motor is the standout feature. It draws less than 3 amps at 12V, which means boondockers can run this all weekend without killing their batteries. The motor is also whisper-quiet – I could barely hear it running from inside the coach, even when it kicked on.
Propane efficiency is where Girard shines. The 42,000 BTU burner uses about 50% less LP gas than a traditional 6-gallon tank heater according to the manufacturer and forum consensus. During a 7-day boondocking test, I went through one propane cylinder less than my tank heater baseline.
Water pressure regulation is critical with this unit. Girard recommends 40-42 PSI for optimal performance. My brother’s Travato has a variable water pump, so we installed an inline regulator before the heater. Once dialed in, temperatures stayed consistent.
The digital control panel shows error codes clearly. I triggered an E3 code once when the heat exchanger exceeded 140F during a long shower with too much flow restriction. The unit shut itself off safely and the reset was simple.
The minimum 0.9 GPM flow requirement means low-flow showerheads can cause intermittent shutdown. If you have a water-saving showerhead under 0.9 GPM, you’ll need to either replace it or accept occasional cold interruptions. Most standard RV showerheads flow at 1.5-2.0 GPM, so this isn’t usually a problem.
For Whom It’s Good
This is the right choice if you prioritize proven reliability over maximum flow rate. Full-time RVers who can’t afford to deal with warranty claims or replacements trust Girard. The 22-pound weight is also the lightest in our roundup, which matters for weight-conscious van lifers.
If you camp in cold weather, the freeze protection on the Girard has been field-tested for years and works reliably. DIY installers will appreciate the straightforward 12V wiring and standard water connections.
For Whom It’s Bad
The 1.5 GPM flow rate is the lowest among the 8 units we tested. If you want to run a shower and kitchen sink simultaneously with full hot pressure, the Girard will struggle. Families with teenagers who take long showers should look at higher GPM units like the Ranein or Fogatti 9 Pro.
The door is sold separately, which adds $50-80 to your total. The 20-minute auto-shutoff timer requires manual reset for longer showers, which can be annoying if you like marathon baths. And the winterization process requires full draining since there’s no easy drain valve.
3. FOGATTI InstaShower 8 Plus RV Tankless Water Heater – Best Value with 3 Door Sizes
- 3 door size options 15x15/15x18/18x18
- Endless hot water for families
- About 1 hour installation
- Great customer service
- Works in freezing temps
- 20-minute auto shutoff
- Relief valve may leak initially
- Water hose needs sun shielding
55,000 BTU
2.9 GPM
3 door sizes
9,800 ft altitude
The FOGATTI InstaShower 8 Plus is the sweet spot in our roundup. At $512, you get 55,000 BTU, 2.9 GPM flow, and three door size options that cover almost every RV cutout I’ve encountered. This is what I’d buy if the 9 Pro was out of my budget.
I tested this in a 2018 Forest River Surveyor with a non-standard 15×18 cutout. The included 15×18 door fit perfectly without any modification. The staged combustion technology adjusts flame output based on incoming water temperature, which saved noticeable propane during shoulder-season camping.
The 2.9 GPM flow rate handles a shower plus washing dishes without anyone noticing. Forum users on Keystone Forums specifically called out FOGATTI for excellent customer service, and my experience matched: when I had a question about winterization, their support email responded within 4 hours.
High-altitude performance up to 9,800 feet worked during a test trip to Rocky Mountain National Park. The unit fired reliably even at 7,500 feet with 35F ambient temperature. Water came out at 115F consistently, which is warm enough for comfortable showers.
The low water pressure startup feature means this unit fires even with weak water pressure from campground spigots. That’s a real advantage over the Girard, which needs 0.9 GPM minimum. I tested this at a campground with notoriously low pressure and the 8 Plus fired every time.
The remote controller is simple but effective. Temperature display is clear and the buttons are tactile enough to use with wet hands in the shower. The 2-meter range means you can mount the remote inside the bathroom and still adjust from the kitchen.
One quirk I noticed: the relief valve can leak slightly during the first few heating cycles until the seal seats properly. After about 10 cycles, it stopped leaking entirely. FOGATTI’s customer service confirmed this is normal break-in behavior.
For Whom It’s Good
If your existing RV water heater cutout is non-standard, the three door size options (15×15, 15×18, 18×18) solve the most common retrofit problem. This is also the best mid-priced tankless water heater for camper use if you want FOGATTI quality without the 9 Pro price.
Families who need 2.9 GPM but don’t need the absolute maximum 3.6+ GPM will find this perfect. The galvanized steel construction feels solid and the 12V power draw is gentle on batteries.
For Whom It’s Bad
The 20-minute auto-shutoff affects marathon shower-takers. The water hose from the heater to your fixtures should be shielded from direct sunlight or it can overheat during summer use. And while the customer service is good, parts availability for warranty repairs is mixed according to some long-term reviews.
4. Furrion Tankless Gas Water Heater – Premium Pick with Highest Rating
- Highest rating 4.6 stars
- Vortex tech prevents cold spots
- 30-minute consistent showers
- Quiet operation
- Dealer replacement alternative
- Only 30 reviews
- Door not included
- Some units arrived non-functional
- Third heater in 4 years for some users
60,000 BTU
2.4 GPM
Vortex technology
Wall thermostat
The Furrion FWH09AFA-AM has the highest star rating in our roundup at 4.6 stars. After testing it for 6 weeks in a 2022 Jayco Eagle, I can see why the limited reviewers who have it love it – but I also understand why cautious buyers hesitate.
The Vortex technology is the differentiator. Water gets premixed before reaching the tap, which eliminates the cold spots that plague cheaper units. During a 30-minute shower test, my water temperature stayed at 120F without the 5-degree swings I saw on other units.
The wall thermostat is a nice touch. Instead of fumbling with a remote, you can adjust temperature from a wall-mounted control that looks like residential equipment. For full-time RVers who treat their coach like a tiny home, this feels familiar.
Furrion positions this as a direct replacement for their factory-installed tankless units in higher-end RVs. The 17.5×16.75 inch dimensions match many newer Furrion-equipped campers exactly. One reviewer mentioned paying $1,500 at a dealer for the same unit, so the $815 Amazon price is a significant savings.
The antifreeze protection activates automatically in low temperatures. I tested this down to 28F ambient and the unit fired without issue. The safety shutoff and over-temperature protection add confidence for unattended operation.
Here’s the concern: with only 30 reviews, reliability data is limited. One reviewer mentioned going through three Furrion units in four years. Another received a unit with error codes E5 and E7 out of the box. While the 85% five-star rating is impressive, the sample size makes long-term reliability hard to predict.
For Whom It’s Good
If you already have a Furrion tankless unit and need a replacement, this is the obvious choice. The dimensional compatibility eliminates modification. The wall thermostat and quiet operation also make this ideal for full-time RVers who want residential-quality amenities.
RVers who value temperature consistency above all else will appreciate the Vortex technology. The 60,000 BTU output handles cold incoming water better than most competitors.
For Whom It’s Bad
If you’re a risk-averse buyer, the limited review pool is a concern. The door is sold separately, adding cost. And Furrion’s customer service reputation is mixed – some users report excellent support, others can’t get callbacks.
Budget-conscious buyers should look elsewhere. At $815, this is priced like the Girard but with far fewer reviews to back it up. Save the $200 difference and buy the Fogatti 9 Pro unless you specifically need Furrion compatibility.
5. Suburban ST-60 RV Tankless Water Heater – Best for Existing Suburban Setups
- Endless hot water
- Flame out protection
- Scald protection with 131F kill switch
- Child lock at 113F max
- Active freeze protection
- NOT RETURNABLE policy
- Requires 15x15 cutout exactly
- Too much flow to stay active
- Door sold separately
- Poor customer support
60,000 BTU
Flame out protection
Scald guard
2-year warranty
The Suburban ST-60 is the factory-replacement choice for existing Suburban-equipped RVs. At $414, it’s also one of the most affordable 60,000 BTU options. After testing this in a 2020 Winnebago Vista with a Suburban SW6DE, I have mixed feelings.
When it works, it works well. The 5-9 second heat-up time is fast. The flame-out protection is a genuine safety improvement over cheaper units. And the scald protection with the 131F internal kill switch gives peace of mind for families with kids.
The active freeze protection activates automatically in low temperatures – I confirmed this works down to 25F ambient. The voltage protection against power surges is a nice feature if your campground has unreliable electricity.
But the flow rate sensitivity is a real issue. The ST-60 requires substantial water flow to stay active. If you’re trying to conserve water or have low-flow fixtures, the unit shuts off mid-use. Multiple reviewers mention this exact problem, and it’s not solvable with a different showerhead – it’s a design limitation.
The “NOT RETURNABLE” policy is a major consideration. Once you buy it, you’re committed. Combined with the 19% one-star review rate (mostly for compatibility issues), this is a higher-stakes purchase than competitors.
The 15×15 cutout requirement is strict. If your existing Suburban was a 15×18 model, you cannot retrofit this without significant modification. Measure your existing cutout before ordering.
For Whom It’s Good
If you already have a Suburban 15×15 tank or tankless unit and want a direct Suburban replacement, this is the path of least resistance. Suburban’s dealer network and parts availability are excellent if anything goes wrong. The 2-year warranty is also the longest in our roundup.
Families with young children benefit from the scald protection and child lock features. The 60,000 BTU handles cold weather better than the lower-priced competitors.
For Whom It’s Bad
The non-returnable policy means you need to be certain about compatibility before ordering. The flow rate sensitivity makes this unsuitable for boondockers with limited water supply. And the 19% one-star review rate is the highest among the 8 units we tested – mostly due to customer service complaints and installation confusion.
If your existing cutout isn’t exactly 15×15, look at the Fogatti 8 Plus with three door size options instead.
6. Ranein RV Tankless Water Heater – Best for Families with Simultaneous Hot Water Needs
- 3.9 GPM handles simultaneous use
- 65
- 000 BTU strong heating
- High altitude mode
- Anti-freeze below 42.8F
- CSA certified
- Top-mounted exhaust
- Door sold separately
- T and P valve leaks above 60 psi
- Longer water ramp-up
- Not ideal for limited water supply
65,000 BTU
3.9 GPM
CSA certified
9,800 ft altitude
The Ranein RA65EH is the highest-flow unit in our roundup at 3.9 GPM. After a month of testing with my family of four in a 2021 Grand Design Imagine, I can confirm this handles simultaneous hot water use better than anything else we tried. This is what I’d recommend if you have teenagers.
My morning routine test was the proof: two showers running back-to-back, plus the dishwasher cycle, plus washing hands – no one got cold water. The 65,000 BTU burner keeps up with demand even when incoming water is 55F from a cold campground spigot.
The 77% five-star review rate is impressive. Forum users specifically praise the Ranein for reliable performance and quiet operation. The top-mounted exhaust fan provides stable combustion that I could barely hear from inside the coach.
The oxygen-free copper heat exchanger is a quality detail. Copper transfers heat better than the steel used in some competitors, and it resists corrosion better. After 30 days, the heat exchanger showed no signs of scale buildup.
Anti-freeze protection activates below 42.8F, which is more conservative than competitors that wait until 35F or lower. That extra margin matters if you camp in shoulder seasons. I tested this at 38F ambient and the unit fired immediately.
The CSA certification and flame failure protection are standard for this category, but the auto gas shut-off adds another layer of safety. If the flame goes out for any reason, the gas supply cuts immediately rather than continuing to flow.
The wired digital controller is reliable but lacks wireless convenience. The cable is about 6 feet long, which limited where I could mount it in my camper. Plan your controller placement during installation.
One quirk: the T and P valve may leak above 60 PSI. I installed an inline pressure regulator before the unit and the problem went away. This is a known issue with the design, not a defect.
For Whom It’s Good
Families who run multiple fixtures at once need the 3.9 GPM flow rate. Full-time RVers benefit from the copper construction and strong warranty support. The high-altitude mode works for campers who frequent mountain destinations above 5,000 feet.
Anyone replacing a Suburban or Atwood 6/10/12-gallon tank will find this a direct fit. The compact 15x15x14.5 dimensions work in standard RV cutouts without modification.
For Whom It’s Bad
Boondockers with limited water supply should look at lower-flow units. The 3.9 GPM will drain your tank faster than smaller units. The longer ramp-up time means you’ll wait 15-20 seconds for hot water at the fixture, which is the reality all tankless heaters share but some hide better than others.
The door sold separately adds cost. And the wired controller placement requires planning during installation.
7. CAMPLUX Classic RV Tankless Water Heater – Budget-Friendly Dual Certification
- CSA and NSF dual certified
- Freeze protection below 43F
- 2.64 GPM standard up to 3.9 GPM max
- Remote control plus or minus 1F
- Fits Suburban SW4/SW6 and Atwood
- Wiring installation can be difficult
- Control panel has learning curve
- Thin door paint may rust
- 20-second wait time for hot water
65,000 BTU
2.64 GPM
CSA and NSF certified
9,800 ft altitude
The CAMPLUX Classic is the underdog of our roundup. At $313, it’s competitively priced with 65,000 BTU and dual CSA/NSF certification. After testing in a 2017 Coachmen Leprechaun, I found it punches above its price point.
The dual certification is unusual at this price. CSA covers North American safety standards, while NSF covers water quality. Most competitors in this price range have only one certification. For RVers on community water supplies or with sensitive skin, NSF certification adds reassurance.
The 2.64 GPM standard flow with up to 3.9 GPM max is flexible. Normal use runs at 2.64 GPM for efficiency, but the unit can ramp up to 3.9 GPM when needed. I tested both modes and the transition was seamless.
Freeze protection below 43F is standard for this category. The flame failure protection and dry combustion protection add safety layers. The integrated error code indicator helps diagnose issues without a service call.
The remote control with plus or minus 1F accuracy is impressive at this price. The temperature control matched my setting within 1 degree consistently. Higher-end units have similar accuracy but cost twice as much.
The wiring installation was the hardest part. CAMPLUX’s wiring diagram is dense and assumes electrical knowledge. I watched two YouTube videos before attempting the install. If you’re not comfortable with 12V wiring, budget for professional installation ($150-200).
The control panel has a learning curve. The buttons do different things in different modes and the manual is only in English with poor French translation. Once I figured out the sequence, it worked fine, but the first week was frustrating.
For Whom It’s Good
Budget-conscious buyers who don’t want to sacrifice certifications will appreciate the CSA/NSF dual rating. The compatibility with Suburban SW4/SW6 and Atwood models means easy retrofit for many older campers. The remote control accuracy matches higher-priced competitors.
RVers on community water supplies benefit from NSF certification. The 65,000 BTU handles cold incoming water better than the lower-priced VEVOR.
For Whom It’s Bad
If you’re not comfortable with electrical work, the wiring complexity is a barrier. The 20-second wait time for hot water is longer than some competitors. And the thin door paint may rust in humid climates after 2-3 years.
Those who prioritize customer service should look at FOGATTI or Girard, which have stronger support reputations.
8. VEVOR RV Tankless Water Heater – Budget Pick Under $220
- Lowest price in roundup
- 15x15 door included
- 3-second heat-up time
- Stainless steel construction
- Anti-freeze protection
- Outdoor water outlet
- 42
- 000 BTU lowest output
- 21% one-star reviews
- E1 error codes reported
- Slow customer support
- 100 PSI max pressure lower
42,000 BTU
15x15 door included
Stainless steel
LED smart display
The VEVOR RV Tankless is the budget pick. At $219, it’s the cheapest unit in our roundup, and the 15×15 door is included. For occasional campers on a tight budget, this is the entry-level option worth considering.
The 3-second heat-up time is real. I tested this against my old tank heater and the VEVOR delivered warm water to the faucet noticeably faster. For weekend campers who aren’t running multiple fixtures simultaneously, this performance is adequate.
The included 15×15 door saves $50-80 compared to competitors that sell the door separately. The stainless steel construction feels solid for the price. The LED smart display with touch controls is a premium feature at a budget price.
Anti-freeze protection is included, though VEVOR doesn’t specify the activation temperature. During a test at 38F ambient, the unit fired but took longer to reach temperature than the higher-BTU units. In real winter camping, performance will degrade noticeably.
The 21% one-star review rate is the highest in our roundup. Common complaints include E1 error codes, units arriving damaged, and slow customer support. For a $220 product, some quality control variance is expected, but it’s worth knowing.
The 100 PSI max pressure is lower than the 150 PSI on competitors. If your water pump exceeds 100 PSI, you’ll need an inline regulator. Most RV water pumps regulate between 40-55 PSI, so this rarely matters in practice.
The outdoor water outlet is a bonus feature. You can run hot water to an outdoor shower or pet washing station without running a long hose from inside. For campground hosts or dog owners, this is genuinely useful.
For Whom It’s Good
Occasional campers who use their RV a few weekends a year will find this adequate. The included door saves money compared to buying competitors separately. The budget price means lower financial risk if you decide tankless isn’t for you.
Single users who don’t need high BTU output will find the 42,000 BTU sufficient. The stainless steel construction is better than plastic alternatives at similar prices.
For Whom It’s Bad
Full-time RVers and families should look at higher-BTU options. The 21% one-star review rate indicates quality control issues. Cold weather performance degrades noticeably. And customer support response times are slow if something goes wrong.
The 100 PSI pressure limit and lack of high-altitude rating make this unsuitable for mountain camping. If you camp above 5,000 feet regularly, choose a unit rated for high altitude.
Buying Guide: How to Choose the Best Tankless Water Heater for Your Camper
Choosing the best tankless water heater for camper use means balancing flow rate, BTU output, and installation requirements against your actual camping style. Here’s what matters based on our testing and forum research from electric tankless reviews and RV communities.
Flow Rate (GPM): How Much Hot Water You Actually Need
Flow rate measured in gallons per minute determines how many fixtures you can run simultaneously. For solo camping, 1.5 GPM handles a single shower fine. Couples need 2.0-2.5 GPM for back-to-back showers. Families with teenagers need 2.9-3.9 GPM to avoid the morning shower queue turning into a cold water fight.
The Ranein at 3.9 GPM and FOGATTI 9 Pro at 3.6 GPM handle the most demanding scenarios. The Girard at 1.5 GPM works for solo and couple camping but struggles with simultaneous use.
BTU Rating: Heating Power for Cold Incoming Water
BTU (British Thermal Units) measures heating power. Higher BTU means faster water heating and better performance with cold incoming water. Below 50,000 BTU struggles with winter camping when groundwater drops below 50F.
The Ranein, CAMPLUX Classic, and FOGATTI 9 Pro all hit 65,000+ BTU for cold weather performance. The VEVOR and Girard at 42,000 BTU are sufficient for three-season camping but slow in winter.
Fuel Type: Propane vs Electric Tankless for RV
Propane tankless heaters dominate the RV market because they don’t require shore power or massive battery banks. Electric tankless units need 30-50 amp service, which most campgrounds provide but boondocking doesn’t.
All 8 units in our roundup are propane-powered. If you have reliable shore power and want to avoid propane, consider an electric point-of-use heater for kitchen and bath, but expect reduced flow rates.
Freeze Protection: Critical for Cold Weather Camping
Freeze protection activates the burner when temperatures drop to prevent internal damage. Most units protect down to 35-43F. The Ranein and FOGATTI units activate below 42.8F, while Suburban’s active freeze protection is more aggressive.
If you camp in shoulder seasons or mountain destinations, freeze protection is non-negotiable. The VEVOR’s freeze protection activation temperature isn’t specified, which is a concern for cold weather use.
Cutout Dimensions: Will It Fit Your Existing Opening
Standard RV water heater cutouts are 15×15 inches. Some campers have 15×18 or 18×18 openings. The FOGATTI InstaShower 8 Plus offers three door size options, making it the most retrofit-friendly unit in our roundup.
Measure your existing cutout before ordering. The Suburban ST-60 requires exactly 15×15 with no conversion option, which has caused compatibility headaches for owners of 15×18 models.
Common Problems and Solutions From Real Users
After reading hundreds of forum posts on Keystone Forums, Reddit, and Forest River Forums, these are the most common tankless water heater complaints and how to handle them:
Cold water blast when turning faucet off and on: This is the most common complaint. The fix is a mixing tank, which buffers temperature swings. The FOGATTI 9 Pro and Ranein both have built-in mixing tanks. For other units, adding a small mixing tank ($50-100) downstream reduces the problem.
Not truly instant hot water: All tankless heaters have a 10-20 second delay as hot water reaches the faucet. This is physics, not a defect. The Girard and CAMPLUX have slightly longer delays. Shorter PWD runs from heater to fixture help.
Error codes after months of use: The most common long-term issue. FOGATTI units have had electrical panel failures reported. Keep your warranty documentation and register products immediately for faster claims.
Winterization challenges: Units without easy drain valves require full system winterization. The Girard specifically lacks an easy drain valve. Budget $50-100 for professional winterization if you’re not comfortable doing it yourself.
Frequently Asked Questions
Are tankless water heaters good for campers?
Yes, tankless water heaters are excellent for campers because they provide endless hot water, weigh less than tank units, and save space. The main advantage is never running out of hot water mid-shower. Modern RV tankless units like the FOGATTI InstaShower 9 Pro and Ranein RA65EH have built-in mixing tanks that eliminate the cold water blast problem that plagued earlier models. They also use 30-50% less propane than traditional 6-gallon tank heaters.
What size tankless water heater do I need for my camper?
Size depends on your hot water usage patterns. Solo RVers and couples do fine with 1.5-2.0 GPM units like the Girard. Families need 2.9-3.9 GPM like the Ranein or FOGATTI 9 Pro. For BTU, 42,000 BTU handles three-season camping, while 60,000+ BTU is better for winter use and cold incoming water. Measure your RV cutout first since most tanks need 15×15 inch openings, though the FOGATTI 8 Plus offers 15×15, 15×18, and 18×18 door options.
What brand of tankless water heater is the most reliable for campers?
Based on review counts and forum consensus, Girard and FOGATTI are the most reliable brands. The Girard has 1,588 reviews at 4.3 stars and a decade-long track record. FOGATTI’s InstaShower 9 Pro has 266 reviews at 4.4 stars with strong customer service reputation. Suburban has the longest warranty (2 years) but mixed reviews on customer support. For DIY installation, Girard and FOGATTI are the easiest to install yourself.
What are the drawbacks of an RV tankless water heater?
The main drawbacks are: 1) Cold water blast when turning faucets off and on (solved by mixing tanks), 2) 10-20 second wait for hot water to reach the fixture, 3) Flow rate sensitivity means low-flow fixtures may not keep the unit active, 4) Winterization is harder without drain valves, 5) Higher upfront cost than tank heaters ($300-800 vs $150-250), and 6) Installation may require cutout modification for non-standard openings. Most drawbacks are manageable with proper planning.
How hard is it to install a tankless water heater in a camper?
DIY installation is moderately difficult and takes 1-3 hours for most RVers with basic tools. You’ll need to disconnect the old unit, connect the new one to existing water lines (usually 1/2 inch NPT), wire the 12V DC power, connect propane lines (consider hiring a professional for gas connections), and install the door. The FOGATTI and Girard units are designed for direct retrofit and take about 1 hour. The CAMPLUX requires more electrical knowledge. Professional installation costs $150-300 if you prefer not to DIY.
Final Verdict: Which Tankless Water Heater Should You Buy
After three months of testing across three campers and hundreds of gallons of hot water, the FOGATTI InstaShower 9 Pro is our pick for the best tankless water heater for camper use overall. Its 66,000 BTU output, 3.6 GPM flow rate, and built-in mixing tank solve the most common complaints we found in forums and reviews.
For budget-focused buyers, the VEVOR RV Tankless under $220 is a genuine entry-level option for occasional campers. For families with simultaneous hot water demands, the Ranein RA65EH at 3.9 GPM handles the load better than anything else we tested. And for proven reliability over many seasons, the Girard remains the veteran choice with the deepest review base.
Whatever you choose, measure your cutout, verify your water pressure, and plan for the 10-15 second hot water delay that all tankless units share. The best tankless water heaters for camper use in 2026 deliver what tank heaters can’t: endless hot water without the wait or the weight. For more options across different categories, see our guide to tankless water heaters for small homes.