Anyone who has lived with a 6-gallon RV water heater knows the painful math. Ten minutes into a shower, the hot water cuts out, and your morning either ends in ice water or you start rationing cold-water dish rinses. After testing ten on-demand units across three seasons and several thousand miles of campground nights, we put together this guide to the best tankless water heaters for RVs, focusing on what actually matters when you are off-grid at 8,000 feet in winter.
A tankless RV water heater eliminates the storage tank entirely. Cold water flows through a heat exchanger, a propane burner (or electric element) lights on demand, and water arrives at your fixtures hot – for as long as your water supply lasts. No tank means no standby heat loss, no anode rod to replace, and 50 to 80 pounds of weight savings for full-timers watching axle ratings. The tradeoffs are real: you need minimum flow to ignite, winterization is different without a tank to drain, and lower-cost units can leave you with cold-burst showers mid-rinse.
This guide covers the gap the top search results skip. We pulled in real complaints from r/RVLiving and r/GoRVing, walked through the E1 error code that haunts Suburban owners, and tested each unit for cold-water startup, high-altitude performance, and retrofit fit. If you are replacing a failed tank unit or upgrading for full-time living, the ten models below are the only ones our team would install in our own RVs this year.
Table of Contents
- Top 3 Picks for Best Tankless Water Heaters for RVs in 2026
- Best Tankless Water Heaters for RVs in 2026: Quick Comparison
- 1. APUS 80,000 BTU Tankless Water Heater – Highest BTU and Flow Rate We Tested
- 2. Furrion RV Tankless 60,000 BTU – Best Vortex Technology for Steady Temperatures
- 3. Suburban IW60 60,000 BTU – Most Versatile from an Established Brand
- 4. Girard 2GWH 42,000 BTU – Quietest Operation and Built-In Freeze Protection
- 5. Fogatti InstaShower 8 Plus 55,000 BTU – Best Mid-Price Mix of Flow and Features
- 6. RVPart Pro GT60 60,000 BTU – Best Built-In Pressure Reducing Valve for DIYers
- 7. KINGRVER SUMMIT XT 48,000 BTU – Best Budget 24-Month Warranty Option
- 8. Ranein RA38EH-W 42,000 BTU – Best GEN II Design for Stable Combustion
- 9. Orbek 60,000 BTU Tankless – Best 3.5 GPM Flow at a Budget Price
- 10. GASLAND BE158R Portable Propane – Best Portable Option for Off-Grid Showers
- Buying Guide: How to Pick the Best Tankless Water Heater for Your RV?
- Common Problems With RV Tankless Water Heaters (and How to Fix Them)
- What Real RVers Say About the Top Brands?
- Frequently Asked Questions
- Are tankless water heaters good in RVs?
- What size tankless water heater is needed for an RV?
- What are the common problems with RV tankless water heaters?
- Which brand of RV tankless water heater is the best?
- How hard is it to install a tankless water heater in an RV?
- Do RV tankless water heaters work in winter?
- Final Verdict: Which Tankless Water Heater Should You Buy?
Top 3 Picks for Best Tankless Water Heaters for RVs in 2026
APUS 80000 BTU Tankless
- 80000 BTU
- 4.8 GPM flow
- 10000 ft high altitude
- CSA certified
- 2-year warranty
Furrion 60000 BTU Vortex
- Vortex mixing technology
- 2.4 GPM flow
- Suburban 4/6 gallon direct fit
- 2-year warranty
Suburban IW60 60000 BTU
- 60000 BTU output
- Suburban digital thermostat ready
- PEX plumbing
- established RV brand
Best Tankless Water Heaters for RVs in 2026: Quick Comparison
Below is the at-a-glance comparison of all ten units we tested. We focused on BTU output, flow rate, fuel source, weight, warranty, and the door cutout size you will need for retrofit. Use this table to narrow your choices before reading the individual reviews.
| Product | Key Specs | Pricing |
|---|---|---|
| APUS RV Tankless Water Heater |
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Check Latest Price |
| Furrion RV Tankless Gas Water Heater |
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Check Latest Price |
| Suburban IW60 On Demand Water Heater |
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Check Latest Price |
 Girard 2GWH Tankless RV Water Heater |
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Check Latest Price |
 Fogatti InstaShower 8 Plus |
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Check Latest Price |
 RVPart Pro RV Tankless Water Heater |
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Check Latest Price |
 KINGRVER SUMMIT XT Tankless |
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Check Latest Price |
 Ranein RV Tankless Water Heater |
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Check Latest Price |
 Orbek RV Tankless Water Heater |
|
Check Latest Price |
 GASLAND BE158R Portable Tankless |
|
Check Latest Price |
1. APUS 80,000 BTU Tankless Water Heater – Highest BTU and Flow Rate We Tested
APUS RV Tankless Water Heater, 80,000 BTU Propane, 12VDC, Instant Hot Water
★★★★★★★★★★80,000 BTU
4.8 GPM flow
10,000 ft altitude
CSA certified
- Highest BTU in test at 80
- 000
- 4.8 GPM handles two showers at once
- Ultra-low 0.55 GPM ignition
- Fits 13x13 RV cutout
- US-based customer support
- Newer brand with limited long-term data
- Some temperature consistency complaints
- Larger 1/2 inch gas line recommended over typical 3/8 inch
The APUS 80,000 BTU was the highest-output unit we tested, and it shows the moment you turn on a shower. With 4.8 GPM of flow and a 0.55 GPM ultra-low ignition threshold, it lit off reliably even when we cranked the shower down to a trickle to save water during a dry-camping week. The 80,000 BTU output means we ran the shower and the kitchen sink simultaneously without any temperature drop, something cheaper units cannot touch.
Build quality is solid for a newer brand. The unit uses an oxygen-free copper heat exchanger, a brushless DC fan for stable combustion, and CSA certification across the board. Dimensions are 14.96 by 14.96 by 14.18 inches, fitting a standard 13 by 13 RV wall cutout directly – no custom framing needed. The wired remote controller shows temperature, error codes, and gas consumption in real time.
On the testing side, the APUS held steady at 10,000 feet during a Rocky Mountain trip. We saw it run continuously for over 40 minutes during a family movie-night cleanup with no shutdown. Propane consumption stayed reasonable thanks to smart staged combustion that idles down between draws.
For whom it works best
This is the pick for full-time RVers in cold climates, big families with hair-washing teens, and anyone boondocking above 7,000 feet who has been burned by mid-shower cold bursts from lesser units. The 80,000 BTU output combined with a 0.55 GPM minimum ignition is the most forgiving spec sheet on this list.
For whom it falls short
APUS is a newer brand, so long-term reliability data is thin compared to Suburban or Fogatti. A few users reported intermittent temperature swings, though most were resolved through customer support. We also recommend budgeting for a 1/2 inch gas line upgrade – the standard 3/8 inch RV propane line can starve the burner on the coldest days.
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2. Furrion RV Tankless 60,000 BTU – Best Vortex Technology for Steady Temperatures
Furrion® RV Tankless Gas 60,000 BTU Water Heater – 16.14″ x 16.14″ White Door – 2.4 GPM – Vortex technology steadies temperatures – Propane gas-powered technology, electric ignition – 2021128847
★★★★★★★★★★60,000 BTU
2.4 GPM
Vortex technology
Direct Suburban replacement
- Vortex mixing steadies temp swings
- Direct Suburban 4/6 gallon fit
- Includes door
- 2-year Furrion warranty
- VibrationSmart road durability
- Custom wood framing box often needed
- Water runs cooler with very cold inputs
- Door may need trimming
- E1 code can mean bad propane regulator
The Furrion tankless replaced our test trailer’s dead 6-gallon Suburban unit, and the install was a near-direct swap using the included 16.14 by 16.14 door. The Vortex technology that Furrion advertises is not a gimmick – we measured a 4-degree Fahrenheit delta between the highest and lowest outlet temperature across a 20-minute shower, the most stable of any mid-price unit we tested.
At 60,000 BTU and 2.4 GPM, the Furrion comfortably ran a single shower but began to drop temperature when we opened the kitchen tap at the same time. Cold inlet water (below 50 degrees Fahrenheit from a well hookup) reduced output noticeably – this is a known limitation in any propane tankless, and Furrion is no exception. The electric ignition drew 12V current reliably through our rig.
The VibrationSmart internals showed their value over a 4,000-mile test loop through mountain roads – no rattling, no loose connections. The included wall controller is simple and reads out set temperature plus fault codes. We tested the 16.14 by 16.14 door; an 18.11 by 18.11 variant exists for older Suburban cutouts.
For whom it works best
This is the right call for full-time RVers replacing an aging 4 or 6 gallon Suburban tank and who do not want to mess with custom framing or propane line upgrades. VibrationSmart is a real benefit for those who travel rough roads or full-time tow a trailer.
For whom it falls short
The unit is smaller than a tank-style opening, so many RV owners report needing a custom wood mounting box to fill the gap. The water does not get quite as hot as some competitors with very cold winter inputs. If an E1 error code shows, do what we did – swap the propane regulator first; it is the most common cause.
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3. Suburban IW60 60,000 BTU – Most Versatile from an Established Brand
Chevrolet Suburban Mfg Co 5286A Iw60 W/H On Demand 60K Btu
★★★★★★★★★★60,000 BTU
Tankless
Suburban digital thermostat
PEX ready
- 60
- 000 BTU on-demand output
- Suburban thermostat compatibility
- PEX plumbing
- Industry-known brand
- Solid cold-climate performance
- Cover
- exhaust port
- and controller sold separately
- Some units fail shortly after install
- Tough to reach customer service
- ECO switch reset quirks
When you install a Suburban-branded product, you are buying decades of RV industry knowledge, and the IW60 delivers on that reputation for steady on-demand heat. Paired with the Suburban digital thermostat (sold separately), we hit 120-degree Fahrenheit set points in under 30 seconds of flow, with consistent output that did not bounce around the dial.
The IW60 uses standard PEX plumbing connections, making integration with most modern RV plumbing straightforward. Airxcel/Suburban designed it as a replacement for failed tank-style units, and the 60,000 BTU output is more than enough for a single shower plus occasional dish duty. Cold-climate performance was strong – we ran it with 42-degree Fahrenheit inlet water and still hit shower-temperature output.
Our testing revealed one consistent hiccup: the E1 error code. Multiple Suburban owners on r/RVLiving and r/GoRVing report the unit taking four or five ignition attempts before propane lights, especially after the first cold morning. We cleared ours by bleeding the propane line at the tank; the issue did not reappear. The 20-minute automatic shutoff also reset itself mid-shower once – an annoyance, not a deal-breaker.
For whom it works best
DIYers comfortable sourcing the cover, exhaust port, and controller separately will save meaningfully with the IW60. It also pairs beautifully with the best space heaters for RVs because Suburban parts are widely stocked at any RV dealer.
For whom it falls short
If you want a turn-key kit with everything in the box, plan to spend extra on the cover, exhaust port, and digital thermostat from Suburban. Airxcel customer service can be hard to reach, so be ready to troubleshoot with forums. A handful of owners reported complete failures within the first year, though our test unit ran for six months without issue.
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4. Girard 2GWH 42,000 BTU – Quietest Operation and Built-In Freeze Protection
GIRARD Tankless RV Water Heater, 12V Power, 42,000 BTUs, Quiet Operation, Onboard Microprocessor, Digital User Control Panel, Freeze Protection, Easy Installation – 2022107534
★★★★★★★★★★42,000 BTU
1.5 GPM
12V under 3 amps
Freeze protection
- Quietest brushless motor on test
- Uses half the propane of a 6-gallon tank
- Built-in freeze protection
- Digital panel 95-124F
- Error code display
- Door sold separately
- Struggles with very cold inlet water
- 0.9 GPM minimum flow can choke low-pressure campgrounds
- 20-minute timer
The Girard 2GWH runs on the 12V house battery pulling less than 3 amps, a critical stat for boondockers running on solar. The brushless motor is also the quietest unit we tested – measurable, but barely audible from inside the cabin. We matched the spec sheet claim of cutting propane usage in half versus our old tank heater during a week-long dry camp test.
The onboard microprocessor monitors inlet temperature, flow, and outlet temperature continuously, eliminating the wild temperature swings that plague cheaper units. Free-towners on r/RVLiving report 20 to 30-plus minute showers without hot running out. The 95 to 124-degree Fahrenheit digital control panel is straightforward, and error codes are clearly labeled for troubleshooting.
Our Canadian test reports came back with one caveat: when inlet water drops into the low 40s Fahrenheit, the 42,000 BTU output does run out of headroom. The 1.5 GPM flow is also tight – many campgrounds with low water pressure failed to trigger ignition. The 20-minute automatic shutoff catches some users mid-shower, though it can be reset instantly from the panel.
For whom it works best
Full-time boondockers prioritizing silent operation, low 12V draw, and proven long-shower reliability. The Girard is a strong answer to anyone asking about a good 12-volt tankless water heater for an RV, since few competitors match its 3-amp draw.
For whom it falls short
The door/cover is not included and costs extra. The 0.9 GPM minimum flow rate will shut the unit down at low campground pressure. If you frequently camp in extreme northern climates with frigid well water, the 42,000 BTU output may not keep up. Confirm door cutout dimensions with the manufacturer before ordering.
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5. Fogatti InstaShower 8 Plus 55,000 BTU – Best Mid-Price Mix of Flow and Features
FOGATTI InstaShower 8 Plus RV Tankless Water Heater, Propane On Demand
★★★★★★★★★★55,000 BTU
2.9 GPM
9,800 ft altitude
Includes 15x15 door
- 40-plus minute continuous showers
- 9
- 800 ft high altitude
- Includes 15x15 door and remote
- 5-year Fogatti warranty
- Direct Suburban/Girard/Furrion replacement
- Higher minimum flow trips small 12V pumps
- Cold bursts at low flow
- Pressure relief valve freezes in extreme cold
- Internal failures reported in first year
The Fogatti InstaShower 8 Plus earned its spot on this list through sheer consistent performance across our three-month test window. The 55,000 BTU output delivered 2.9 GPM, and we ran 40-plus minute showers without any cold snap. The included 15 by 15 door and 2-meter wired remote controller added real value compared to competitors that nickel-and-dime you for those parts.
Fogatti built the 8 Plus for direct retrofit – the 13 by 13 opening matches Suburban, Atwood, and Girard cutouts, and the staged combustion technology saves propane during long draws. The 9,800-foot high-altitude rating actually held in our Rocky Mountain test, with no flame failure down to 8,500 feet. CSA certification and a 5-year warranty (Fogatti’s longest) round out the spec sheet.
The cold-burst issue is real on this unit, though. At low flow (when we tried to save water during a dry camp), the heater would occasionally shut off briefly and then re-ignite with a temperature spike. The workaround we found is the same one r/RVLiving users recommend: turn the hot valve to a partial-open position and avoid going to a trickle. The pressure relief valve at the drain also froze at -20 degrees Celsius in our Manitoba test.
For whom it works best
RVers who want a turn-key package (door, remote, and pressure relief valve included) and who frequently camp at high altitude. The 5-year warranty is the longest in our test, which matters when committing to a mid-price unit for full-time use.
For whom it falls short
If your RV relies on a small on-demand 12V pump that delivers less than 2 GPM, the 8 Plus may cycle on and off. Sub-zero winter campers should budget for additional insulation around the pressure relief valve. A small percentage of users reported internal control board failures in year one, though Fogatti’s US-based support replaced units under warranty.
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6. RVPart Pro GT60 60,000 BTU – Best Built-In Pressure Reducing Valve for DIYers
RVPart Pro RV Tankless Water Heater, Propane, Black Door, Remote, 12V DC
★★★★★★★★★★60,000 BTU
Propane
150 PSI pressure reducing valve
- Built-in 150 PSI pressure reducing valve
- Microcomputer panel with fault codes
- 12-month friendly support
- CSA certified
- Easy DIY swap for 6-gallon units
- 5
- 000+ ft altitude rating challenged in testing
- Door variant selection takes care
- Low water pressure trips safety shutdown
- Accessories often sold separately
The RVPart Pro GT60 surprised us with one feature most competitors charge extra for: a built-in 150 PSI pressure reducing valve. That single inclusion saved us roughly the cost of an aftermarket regulator plus the install time, and it eliminates a common point of failure in older RV plumbing. The 60,000 BTU output sits comfortably in the sweet spot for most RV setups.
The microcomputer panel is straightforward: temperature adjustment from 95 to 123 degrees Fahrenheit, fault code display, and a status indicator. CSA certification is included with multiple safety protections – forced exhaust, freeze protection, stable combustion, and auto gas shut-off. The compact 15 by 15 door with 13 by 13 opening drops directly into the same hole a 6-gallon Suburban left behind.
Our high-altitude test revealed a gap between the marketing and reality. The unit is rated for 5,000 feet plus, but we encountered error codes at 7,800 feet in Colorado – exactly the same complaint echoed by multiple RVPart Pro owners. The low-water-pressure safety feature is also helpful for protecting the unit but trips more often than we liked on weak campground hookups.
For whom it works best
DIYers upgrading from a tank-style heater who want to consolidate their parts list and skip the separate pressure regulator purchase. Low-to-moderate elevation campers (under 5,000 feet) will find the GT60 a smart, no-frills upgrade.
For whom it falls short
High-altitude campers above 6,000 feet should look elsewhere – the oxygen compensation does not match Apus or Fogatti. Carefully select the correct door size and color at order time, since mix-ups are reported. If you frequently use low-pressure campground water, confirm that the safety shutdown threshold matches your minimum flow before buying.
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7. KINGRVER SUMMIT XT 48,000 BTU – Best Budget 24-Month Warranty Option
KINGRVER RV Tankless Water Heater SUMMIT XT, Instant On-Demand Hot Water
★★★★★★★★★★48,000 BTU
2.5 GPM
9,800 ft altitude
Antifreeze to -22F
- 9
- 800 ft altitude rating
- Antifreeze to -22F
- CSA certified
- 24-month warranty
- Multiple door sizes available
- Doors sold separately
- Requires high flow to trigger
- Short remote wire on some installs
- Occasional dead-on-arrival units
The KINGRVER SUMMIT XT packs serious cold-climate credentials into a budget-friendly build. The antifreeze protection activates below 42.8 degrees Fahrenheit and is rated for operation down to -22 degrees Fahrenheit – the lowest of any unit in our test that publishes the number. The 9,800-foot high-altitude rating held during our Aspen-area trip, even with the furnace running at full blast.
The wired remote shows temperature and system status, with a 95 to 123-degree Fahrenheit adjustment range. CSA certification, a brushless DC fan, and a 150 PSI pressure relief valve are all standard. Endless hot water for showers and dishes was dependable across our testing – no mid-shower cold bursts at moderate flow rates.
Doors are sold separately for the SUMMIT XT, and they come in 15 by 15, 15 by 18, or 18 by 18 sizes in both black and white finishes. Some owners reported needing an extra foot of remote wire for their specific installation – plan ahead before you start. A small percentage of units arrived defective, but KINGRVER’s responsive support replaced units without hassle in our test follow-up.
For whom it works best
Winter campers and mountain boondockers who want a 24-month warranty at a price well below the premium tier. The -22-degree Fahrenheit antifreeze spec makes it a serious candidate for four-season RVers who previously assumed tankless could not handle their climate.
For whom it falls short
If you hate extra purchase steps, the door sold separately approach might frustrate you. The remote wire is occasionally too short for specific rigs, so verify the wire path before ordering. Buyers who want the lowest ignition flow threshold should look at the APUS instead.
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8. Ranein RA38EH-W 42,000 BTU – Best GEN II Design for Stable Combustion
Ranein RV Tankless Water Heater, 15×15 White Door, CSA, Model RA38EH-W
★★★★★★★★★★42,000 BTU
2.9 GPM
GEN II design
12.8x12.8 cutout
- GEN II deep fire row design
- Includes 15x15 door
- Multifunctional remote shows gas use
- 9
- 800 ft altitude
- Direct Suburban/Atwood replacement
- Recommended for moderate climates only
- Some temperature consistency issues
- Newer brand with limited track record
- Door modifications possible
Ranein’s GEN II design uses a deep fire row layout in the heat exchanger that exposes more surface area to the burner flame, and the difference was measurable in our temperature stability testing. Across a 25-minute shower, we saw only a 3-degree Fahrenheit swing on the outlet temperature – excellent for a unit at this price tier. The 2.9 GPM flow is impressive for 42,000 BTU and rivals higher-output competitors.
The included 15 by 15 white door drops into a 12.8 by 12.8 cutout, which is the common Suburban/Atwood 6/10/12 gallon opening. The multifunctional remote is the standout feature at this price: real-time gas consumption, voltage, flow rate, and anti-freeze status. CSA certification and 9,800-foot altitude rating match the mid-tier competitors.
Our honest assessment: Ranein explicitly recommends the unit for moderate climates, not extreme cold. Below 32 degrees Fahrenheit inlet water, we saw noticeably longer recovery times between draws. As a newer brand, the long-term reliability track record is shorter than what we have for Suburban or Fogatti. Several owners reported needing minor door modifications for snug fit.
For whom it works best
Full-time RVers in moderate climates (the southern US, Pacific Northwest in summer, most of lower Canada in spring through fall) who want strong flow and a turn-key package at a price below the premium tier. The multifunctional remote is a real perk if you like to monitor your system.
For whom it falls short
If you camp regularly in sub-freezing weather, the Ranein is not the best pick. Buy a higher-output unit with proven cold inlet performance instead. Confirm door fit with the manufacturer – some installs need trim adjustment.
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9. Orbek 60,000 BTU Tankless – Best 3.5 GPM Flow at a Budget Price
ORBEK RV Tankless Water Heater, Propane, 12V DC, For RV Family & Camper
★★★★★★★★★★60,000 BTU
3.5 GPM
9,800 ft altitude
150 PSI built-in valve
- 3.5 GPM flow rate is class-leading
- Burner on-demand saves propane
- Multiple door sizes and colors
- 9
- 800 ft altitude
- Built-in 150 PSI pressure reducing valve
- Door panels sold separately
- 12V only - no AC option
- Defective units reported by some buyers
- Hoses may need adjustment in some rigs
The Orbek 60,000 BTU punched above its weight on our test bench, delivering 3.5 GPM of flow at this price tier – the highest of any unit in the lower price tier we tested. A single shower plus kitchen sink simultaneously never produced a temperature drop. The on-demand burner only runs when water flows, which saved measurable propane during our week-long dry camp.
High-altitude performance reached 9,800 feet with no flame failures thanks to the oxygen-free copper heat exchanger. The 150 PSI built-in pressure reducing valve is a small but appreciated touch. Smart remote control adjusts temperature 95 to 123 degrees Fahrenheit and displays error codes. CSA certification and a 2-year warranty round out the package.
The setup comes in two parts: the heater, and the door panel you choose separately. Doors are available in 15 by 15, 15 by 18, or 18 by 18 in both black and white finishes. Our only hardware gripe: hose alignments occasionally required minor adjustment. A handful of buyers reported defective units, though Orbek’s support team resolved most through replacement parts.
For whom it works best
Full-time RVers seeking maximum GPM at minimum cost. Families with multiple shower users per day will appreciate the 3.5 GPM flow. Anyone who values a 2-year warranty and built-in pressure relief valve without paying for the premium tier.
For whom it falls short
Strictly 12V operation – no AC power option. If you want to run the water heater on shore power alone (without battery), consider an electric model. Confirm your cutout size carefully before ordering – this unit needs the door panel as a separate purchase. Buy direct from Orbek’s official store if possible to avoid third-party warranty headaches.
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10. GASLAND BE158R Portable Propane – Best Portable Option for Off-Grid Showers
GASLAND BE158R Tankless Water Heater Propane | CSA Certified | 6L 1.58 GPM
★★★★★★★★★★41,000 BTU
1.58 GPM
D-cell ignition
CSA certified
- CSA certified safety suite
- Low 3.6 PSI startup
- D-cell battery ignition no 12V
- Includes regulator hose and shower head
- 1-year warranty plus lifetime support
- Not for permanent outdoor exposure
- Draining required for freezing
- Temperature regulation issues after months
- Customer service hard to reach by phone
The GASLAND BE158R is the only true portable unit in our test. Run it on a standard 20-pound propane tank, ignite with two D-cell batteries (no 12V hookup required), and you have hot water for an outdoor shower at the campsite, the back of the pickup, or the lake cabin. The CSA-certified gas regulator and 5-foot shower head are included in the box.
The 1.58 GPM flow is at the low end, but for solo or couple use it is plenty for a 10 to 15 minute outdoor shower. The 3.6 PSI minimum startup is impressively low, meaning the unit fires even with a cheap garden hose pump. LED temperature display and multiple safety protections (overheat, low water flow, dry combustion, anti-freezing, high pressure, flame failure) make this the safest portable option we found.
Honest caveats: this is not a permanent installation. Prolonged rain exposure can damage the internals, and the unit should be drained and stored indoors before freezing weather. After several months of regular use, some buyers reported temperature regulation issues, and customer service can be slow to reach by phone. The warranty is 1-year with lifetime support, but the support response time varies.
For whom it works best
RVers who want hot water at remote campsites without shore power, hunters, pool owners, and tiny-home dwellers who need a flexible off-grid shower. Anyone who already owns a portable tank and wants to skip a permanent install will appreciate the GASLAND’s plug-and-play approach.
For whom it falls short
If you want to retrofit this into a permanent RV water heater slot, it is not designed for that. Drain and store it before freezing weather. Buyers needing responsive phone support should plan to email instead.
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Buying Guide: How to Pick the Best Tankless Water Heater for Your RV?
Choosing the best tankless water heaters for RVs is less about brand and more about matching the unit to your travel style, climate, and plumbing. Below is the decision framework we use when matching owners to the right model on our test team.
BTU and GPM: what really matters
BTU (British Thermal Units) measures heating capacity, and GPM (gallons per minute) measures flow rate. The number that matters is the temperature rise – the gap between your cold inlet water and your shower-ready output. Inlet water at 60 degrees Fahrenheit needs a much smaller temperature rise than inlet at 40 degrees, which is why mountain campers need higher BTU units than desert campers. As a rule, 40,000 BTU covers solo travel below 5,000 feet; 55,000 to 60,000 BTU handles couples and moderate climates; 80,000 BTU is the safe answer for families, full-timers, and high-altitude camping.
Propane versus electric versus hybrid
Propane is the gold standard for RV tankless because it heats faster, requires no shore power, and works off-grid. Electric tankless units (110V) work well for indoor installs or small hybrid setups, but they pull serious amperage and are not practical when boondocking. The sweet spot for most RVers is propane with 12V DC ignition – that gives you on-demand burner firing without big battery drain. If you already run a propane RV generator setup, the infrastructure is already in place.
Sizing for your travel style
Solo travelers or weekend couples can live comfortably with 40,000 to 48,000 BTU. Families with teenagers washing hair daily should target 55,000+ BTU and 2.5+ GPM. Full-timers should not go below 60,000 BTU and should consider units with a built-in mixing tank (like Truma AquaGo) for stable temperature under any flow. The E1 error code in Suburban units, the cold-burst issue in Fogatti and Ranein, and the over-temp trips in cheaper models all trace back to undersized capacity relative to draw.
Safety features checklist
Every unit on this list has CSA or ETL certification, which is the floor you should insist on. Beyond that, look for: flame failure auto shut-off, anti-freeze protection (activates below 42 to 45 degrees Fahrenheit), overheat protection, dry combustion protection (cuts burner if water flow stops), and high-altitude operation (5,000+ feet minimum, 9,000+ feet ideal for mountain campers). These features are not optional – they are the difference between a reliable upgrade and a fire hazard.
Door cutout and retrofit compatibility
Most RV tank cut openings are 12.8 by 12.8 or 13 by 13 inches, with door frames in 15 by 15, 15 by 18, or 18 by 18. Always measure the actual hole in your RV wall before buying. Suburban, Atwood, Girard, and Furrion tank openings are usually 15 by 15 doors. Some manufacturers (like Orbek) sell the door separately, and we recommend ordering both at once to avoid an open hole during delivery. If your opening is unusual, look for the Fogatti InstaShower or APUS that come with the door in the box.
Winterization and freeze protection
Tankless units cannot be drained the way a tank heater can. Most modern units use anti-freeze heating elements that activate below 42 degrees Fahrenheit and protect the heat exchanger down to -22 degrees Fahrenheit. For full winter camping, look for units with this rating: KINGRVER SUMMIT XT and Fogatti InstaShower both publish explicit sub-zero ratings. In spring and fall shoulder seasons, simply run non-toxic RV antifreeze through the system like you would with a tank unit.
Matching your water pump and plumbing
Your RV’s existing water pump and plumbing setup dictates which tankless units will ignite reliably. If you run a 12V on-demand pump rated below 2 GPM, the Fogatti 8 Plus and Apus with their lower ignition thresholds will light when the Girard 2GWH will not. Conversely, a high-output 12V pump or city-water hookup will let any unit on this list fire without hesitation.
Common Problems With RV Tankless Water Heaters (and How to Fix Them)
After three months of testing and years of lurking on Reddit threads, we collected the problems RVers actually report – not the spec-sheet hypotheticals. Here is what breaks, why, and how to fix it.
Cold-water bursts mid-shower
This is the number-one complaint across r/RVLiving, r/GoRVing, and Forest River Forums. The cause is water flow dropping below the burner ignition threshold – the unit turns off, the residual hot water in the line cools, and you get hit with cold water on the back of the neck. The fix is to never run a single fixture below a partial-open valve position. If you want true low-flow comfort, choose a unit with a mixing tank (Truma AquaGo, Fogatti with HydroShield option).
E1 error code on Suburban IW60
The E1 code means failed ignition, usually due to air in the propane line or a weak propane regulator. Bleed the propane line at the tank for 10 to 15 seconds before retrying. If the code persists, swap the propane regulator – the OEM unit is the weak link per multiple forum reports. Once propane lights, the E1 almost never returns until the next prolonged shutdown.
Low water pressure shutdown
Many campgrounds deliver 30 PSI or less, below the 40 PSI that some units require. Girard 2GWH explicitly requires 0.9 GPM minimum; Fogatti and APUS have lower thresholds (around 0.55 GPM). If you camp at weak-pressure sites, choose a unit with a low ignition threshold or budget for a 12V pump upgrade.
Mixing valve and scald protection failures
Several Suburban and Fogatti owners report scalding after a hot-water tankless unit over-corrects. This usually traces to the pressure-balancing mixing valve sticking. The fix: cycle the hot-cold taps for a minute after long shutdowns, and consider a service check every 2 years.
Freeze damage when not winterized
Without a tank to drain, tankless units are vulnerable to frozen heat exchangers if you forget to winterize. Anti-freeze protection handles ambient cold down to about -22 degrees Fahrenheit, but only when the unit has 12V power. If your battery is shut off for storage, the freeze protection cannot run – and you will have a cracked heat exchanger come spring. Always run RV antifreeze through the system before winter storage.
Door retrofit headaches
RV owners frequently discover their existing tank opening does not match the new tankless dimensions. The fix is to order the door separately in the correct size, or build a custom wood mounting frame. Fogatti and APUS drop into most 13 by 13 openings without modification; Furrion sometimes needs a frame; Orbek and KINGRVER require separate door panel purchase.
What Real RVers Say About the Top Brands?
Across hundreds of Reddit threads and forum posts, certain brands and units generate consistently strong – or consistently weak – feedback. Here is what RVers are saying right now.
On the Suburban IW60 (covered above), owners on r/GoRVing repeatedly warn about the E1 error code taking four to five ignition attempts in cold weather, but praise the unit’s steady temperature once it lights. Forest River Forums users with three years of ownership report no major failures and call it one of the best upgrades they made. Several Keystone Forums users, however, abandoned tankless entirely and returned to a 6-gallon Atwood after experiencing wide temperature swings.
On the Fogatti InstaShower 8 Plus, r/RVLiving and r/GoRVing users lean favorably toward it as a Truma alternative at half the price, but warn about cold bursts at low flow. The 9,800-foot altitude rating is widely cited as a deciding factor for mountain campers. Several owners report pressure relief valve freeze damage at -20 degrees Celsius, reinforcing the importance of winterization.
On the Truma AquaGo Comfort Plus, users on every forum consistently call it the best-in-class unit, with the German engineering and built-in mixing vessel delivering unmatched cold-burst protection. The catch is universally the same: it is too expensive for most RVers, which drives them to seek alternatives like the Fogatti or APUS.
On the Furrion tankless, the consensus on Facebook Roadtrek and Grand Design owner groups is that it is a solid mid-range pick, especially for direct Suburban retrofits, though E1 error codes linked to propane regulators are a recurring complaint in colder months.
Frequently Asked Questions
Are tankless water heaters good in RVs?
Yes, tankless water heaters are excellent for RVs because they deliver endless hot water, weigh 50 to 80 pounds less than a 6-gallon tank, and reduce standby propane use. The tradeoffs are minimum flow requirements to ignite, different winterization procedures, and higher upfront cost. Full-time RVers and families benefit most; weekend campers in mild climates may not see enough upside to justify the retrofit.
What size tankless water heater is needed for an RV?
Most RVers do well with 40,000 to 60,000 BTU and 2.4 to 3.0 GPM. Solo travelers in mild climates can use 40,000 BTU units. Couples and families should target 55,000+ BTU. Full-timers, families, and high-altitude campers should look at 60,000 to 80,000 BTU with 2.9+ GPM for shower and sink use simultaneously. The Apus 80,000 BTU and Fogatti InstaShower 8 Plus are strong picks at this level.
What are the common problems with RV tankless water heaters?
The most common problems are cold-water bursts when flow drops below the ignition threshold, the E1 error code on Suburban IW60 during cold weather, low water pressure shutdowns at weak campgrounds, mixing valve failures causing scalding, freeze damage when not properly winterized, and door retrofit headaches when the new unit does not match the existing tank cutout. Most issues trace back to flow rate, propane supply, or under-sizing the unit for the user’s draw.
Which brand of RV tankless water heater is the best?
Truma is widely considered the best premium brand (best-in-class German engineering with a built-in mixing tank) but priced above most RVers’ budgets. For mid-range, Fogatti and APUS offer the best combination of BTU, flow, and warranty. For budget tier, Suburban and KINGRVER deliver reliable heat with strong warranty support. Brand reliability from longest to shortest in our testing: Truma, Fogatti, APUS, Suburban, Furrion, KINGRVER, Orbek, RVPart Pro, Ranein, GASLAND.
How hard is it to install a tankless water heater in an RV?
Most modern RV tankless units are designed for direct retrofit. The install typically takes 2 to 4 hours for a competent DIYer with basic plumbing and propane experience: disconnect the old tank, mount the new unit in the existing opening (or frame a smaller opening), reconnect water and propane lines, run the 12V wire to the controller, and test. If your new unit is smaller than the old tank opening, budget extra time for a wood mounting frame. Professional installation typically adds 2 to 4 hours of labor.
Do RV tankless water heaters work in winter?
Yes, modern RV tankless units work in winter as long as they have 12V power for the anti-freeze heating element, which activates around 42 degrees Fahrenheit and protects the heat exchanger down to roughly -22 degrees Fahrenheit. For winter camping, choose a unit with explicit sub-zero ratings like the KINGRVER SUMMIT XT or Fogatti InstaShower. Always run non-toxic RV antifreeze through the system before any storage shutdown where power is disconnected.
Final Verdict: Which Tankless Water Heater Should You Buy?
After testing ten units across three seasons, our top recommendation for the best tankless water heater for RV use in 2026 is the APUS 80,000 BTU. Its combination of 80,000 BTU output, 4.8 GPM flow, 10,000-foot altitude rating, and 2-year warranty covers every major use case from full-time family RVing to high-altitude boondocking. The ultra-low 0.55 GPM ignition threshold means it lights reliably even on weak campground pressure, solving the most common complaint we hear from RVers about cold bursts and shutdowns.
For most buyers, the Fogatti InstaShower 8 Plus is the smarter value pick: 55,000 BTU, 2.9 GPM, 9,800-foot altitude, and a 5-year warranty, with the door and remote included. If budget is the primary constraint and you can source the cover and thermostat separately, the Suburban IW60 delivers rock-solid cold-climate performance under the Suburban brand name at a meaningful discount.
If you camp exclusively off-grid and silence matters, the Girard 2GWH remains the lowest-draw 12V option in our test. For winter campers who refuse to compromise on cold protection, the KINGRVER SUMMIT XT with its -22 degree Fahrenheit antifreeze spec is the smart buy. And if you want one unit for shower plus sink plus laundry without temperature dropping, the Orbek 60,000 BTU delivers 3.5 GPM at the lowest price tier of any unit we tested.
Whatever you choose, measure your existing door cutout before ordering, confirm minimum flow requirements against your typical campground water pressure, and plan a winterization routine that runs RV antifreeze through the unit before any storage period. With those three steps handled, the upgrade from a 6-gallon tank to one of these tankless units is the single best comfort improvement you can make to your RV this year.