A tankless water heater can make RV showers less dependent on a small stored-water supply, but only if the unit fits your rig and works with its propane, electrical, and plumbing systems.
These 10 options span different heating ratings, door finishes, and control features. Use the buying guide below to narrow your choice before checking the exact installation requirements.
Best 10 Rv Tankless Water Heaters Picks for 2026
Best for Steady Temperatures
- 66,000 BTU; up to 3.6 GPM
- Built-in temperature-stabilizing mixing tank
- 15-by-15-inch door and controller included
Best For: RV families wanting steadier showers and higher flow
Best Black-Finish Retrofit
- Black 15-by-15-inch door included
- 55,000 BTU; up to 2.9 GPM
- High-altitude mode rated to 9,800 feet
Best For: Compatible RV retrofits needing a black exterior door
Best White-Finish Retrofit
- White 15-by-15-inch door included
- 55,000 BTU; up to 2.9 GPM
- Wired controller and relief valve included
Best For: Compatible RV retrofits needing a white exterior door
Highest Rated Flow
- 65,000 BTU; up to 3.9 GPM
- Remote shows flow, voltage, and gas use
- Exterior door sold separately
Best For: RV households prioritizing rated flow and operational readouts
Best for Mountain Travel
- 48,000 BTU; up to 2.5 GPM
- High-altitude mode up to 9,800 feet
- Exterior door sold separately
Best For: Mountain travelers prioritizing steady shower temperatures
Best for Higher Flow
- 65,000 BTU; up to 3.9 GPM
- Controller shows flow and system readings
- Exterior door sold separately
Best For: RV families seeking higher-flow hot water
Best with Included Door
- 68,000 BTU; up to 3.9 GPM
- Starts at a stated 0.55 GPM
- White 15-by-15-inch door included
Best For: RV owners seeking a white-door replacement with low-flow startup
Best for High-Flow Showers
APUS 68,000 BTU RV Tankless Water Heater
- Up to 3.9 GPM; starts at 0.55 GPM
- Rated for elevations up to 9,800 feet
- 12V DC and propane required
Best For: Higher stated flow and varied elevations
Best for Temperature Controls
ORBEK 60,000 BTU RV Tankless Water Heater
- Up to 3.5 GPM stated flow
- Remote sets 95–123°F and shows error codes
- Door panels sold separately
Best For: Remote temperature adjustment and diagnostics
Best for a Thermostat-Controlled Retrofit
Furrion 2.4 GPM Tankless Water Heater
- 2.4 GPM and 60,000 BTU stated output
- Wall thermostat included
- Designed for tank-heater retrofits
Best For: Thermostat-controlled tank-heater upgrades
Best for Steady Temperatures – FOGATTI InstaShower 9 Pro
Among RV tankless water heaters, the InstaShower 9 Pro stands out for its built-in mixing tank and rated output of up to 3.6 GPM. Its 66,000-BTU propane burner is designed to serve an RV shower and kitchen faucet at the same time.
Best For: RV families who prioritize steadier shower temperatures and higher flow.
Pros:
- Built-in mixing tank helps stabilize water temperature.
- Staged burner adjusts between summer and winter operation.
- Includes a 15-by-15-inch door, trim ring, wired controller, and pressure relief valve.
Cons:
- Replacing a 10-gallon tank heater requires an 18-by-18-inch door retrofit.
- Requires liquid propane and 12V DC power.
This is the stronger-flow FOGATTI option here, with a mixing tank that gives temperature stability a specific design feature. Check the RV opening and door size before ordering.
Best Black-Finish Retrofit – FOGATTI InstaShower 8 Plus
The black InstaShower 8 Plus is one of the RV tankless water heaters to consider when replacing a unit in a 13-by-13-inch opening. Its propane burner is rated at 55,000 BTU and up to 2.9 GPM, with 12V DC power for operation.
Best For: Owners seeking a black 15-by-15-inch-door replacement for a compatible RV water-heater opening.
Pros:
- High-altitude mode is rated for operation up to 9,800 feet.
- Staged combustion reduces burner output in warmer conditions.
- Includes a 15-by-15-inch door, wired controller, and pressure relief valve.
Cons:
- Its 2.9-GPM rating is lower than the higher-flow models in this roundup.
- A 10-gallon tank-heater replacement calls for an 18-by-18-inch door retrofit.
Choose this version if its black exterior door suits your RV and the 13-by-13-inch opening matches. Verify door coverage and hookups rather than assuming every existing installation is a direct swap.
Best White-Finish Retrofit – FOGATTI InstaShower 8 Plus
For shoppers comparing RV tankless water heaters by exterior finish, this white InstaShower 8 Plus pairs a supplied 15-by-15-inch door with a heater designed for a 13-by-13-inch opening. It runs on propane with 12V DC power and is rated for up to 2.9 GPM.
Best For: RV owners replacing a compatible heater who want a white exterior door.
Pros:
- 55,000-BTU burner provides on-demand hot water without a storage tank.
- High-altitude mode is rated for operation up to 9,800 feet.
- Includes a wired controller and built-in pressure relief valve.
Cons:
- Its 2.9-GPM rating is lower than the 3.6- and 3.9-GPM options listed here.
- Replacing a 10-gallon tank heater requires an 18-by-18-inch door retrofit.
Its listed performance closely matches the black InstaShower 8 Plus, so finish is the clearest reason to choose between them. Measure the cutout and exterior door area before buying.
Highest Rated Flow – Ranein ExploreFlow Pro RA65LH
The Ranein ExploreFlow Pro has the highest listed flow rating among these RV tankless water heaters: up to 3.9 GPM from a 65,000-BTU propane burner. Its thermostatic mixing chamber is designed to reduce temperature fluctuations when water demand changes.
Best For: RV households prioritizing rated flow and visibility into heater operation.
Pros:
- Remote displays gas consumption, voltage, water flow, and anti-freeze status.
- Temperature setting range runs from 95°F to 124°F.
- Includes a built-in pressure relief valve and anti-freeze protection.
Cons:
- Exterior door is not included; compatible door kits are sold separately.
- Requires liquid propane and 12V DC power.
The flow rating and remote readouts make this a compelling choice for frequent RV use, but budget for a door kit and confirm that its 12.8-by-12.8-inch opening requirement fits your installation.
Best for Mountain Travel – FOGATTI InstaShower 7
Among RV tankless water heaters, the propane-powered FOGATTI InstaShower 7 is a practical choice for travelers who camp at elevation. Its 48,000 BTU burner delivers up to 2.5 GPM, while a high-altitude mode is rated for use up to 9,800 feet.
Best For: RV owners who want on-demand hot water for showers and dishes during mountain trips.
Pros:
- Staged combustion helps maintain a consistent water temperature.
- Wired controller adjusts the set temperature from 95°F to 123°F.
- Includes a built-in 150 PSI pressure relief valve and antifreeze protection.
Cons:
- Exterior door is sold separately; check the available door sizes against your RV.
- Its 2.5 GPM maximum flow is lower than the two 3.9 GPM models in this roundup.
This is a sensible fit if altitude capability and temperature control matter more to you than maximum flow. Measure your installation area and budget for the required door before ordering.
Best for Higher Flow – Ranein RA65EH
The Ranein RA65EH stands out among RV tankless water heaters for its stated 3.9 GPM maximum flow and 65,000 BTU propane burner. It is designed for RV households that may use a faucet while someone showers, although actual flow depends on the RV’s water supply.
Best For: Full-time RVers and families seeking higher-flow on-demand hot water.
Pros:
- Temperature setting spans 95°F to 124°F, with staged combustion for temperature control.
- Wired controller displays water flow, voltage, gas consumption, and antifreeze status.
- Includes a pressure relief valve, freeze protection, and a high-altitude mode rated up to 9,800 feet.
Cons:
- Exterior door is not included and must be purchased separately.
- The specified 12.8-by-12.8-inch opening should be checked against your RV before installation.
Choose this model if its higher stated flow and detailed controller readouts are worth the extra installation planning. Confirm cutout and door compatibility rather than assuming any existing water-heater door will fit.
Best with Included Door – APUS 68,000 BTU
For buyers comparing RV tankless water heaters with an exterior door, this APUS configuration includes a white 15-by-15-inch door. Its propane burner is rated at 68,000 BTU and up to 3.9 GPM, with a stated 0.55 GPM minimum flow for startup.
Best For: RV owners who want a white-door replacement unit with higher stated flow and low-flow startup.
Pros:
- Includes a wired controller for adjusting the 95°F-to-124°F temperature setting.
- Rated for operation up to 9,800 feet and includes powered freeze protection.
- CSA certified, with flame-failure, dry-burn, and over-temperature protections.
Cons:
- The included white 15-by-15-inch door may not match every RV opening or exterior.
- Freeze protection requires the unit to remain properly powered.
Its included door and low stated startup flow make this a convenient option when those specifications match your setup. Verify the 12.6-by-12.6-inch cutout requirement and available installation depth before buying.
Best for High-Flow Showers – APUS 68,000 BTU RV Tankless Water Heater
Among rv tankless water heaters, this APUS model stands out for its stated 3.9 GPM maximum flow and 68,000 BTU propane burner. It starts at 0.55 GPM, which may help when an RV faucet is running at a lower flow.
Best For: RV owners who prioritize higher stated flow and travel at varying elevations.
Pros:
- Rated for up to 3.9 GPM with a 0.55 GPM startup flow.
- Designed for operation at elevations up to 9,800 feet.
- Includes a wired controller and freeze protection that activates at 35.6°F when properly powered.
Cons:
- Requires both propane and 12V DC power.
- Confirm the stated 12.6 × 12.6-inch cutout and compartment dimensions before ordering.
The stronger stated output makes this a useful option to compare for longer showers, but actual flow will depend on your RV’s water supply and incoming water temperature. Measure the opening and plan for a powered freeze-protection system rather than assuming the unit is protected while shut off.
Best for Temperature Controls – ORBEK 60,000 BTU RV Tankless Water Heater
The ORBEK is a practical choice among rv tankless water heaters if you want on-demand propane heating with an adjustable remote. Its stated output is 60,000 BTU and up to 3.5 GPM, with a 95–123°F temperature setting range.
Best For: RV owners who want remote temperature adjustment and error-code feedback.
Pros:
- Remote displays error codes and lets you adjust the temperature from 95°F to 123°F.
- Staged combustion is designed to help maintain consistent water temperature.
- Includes frost protection and a built-in 150 PSI pressure valve.
Cons:
- Door panels are sold separately; choose one that fits your RV’s opening.
- Requires a 12V DC supply as well as propane.
Check your existing cutout before buying: ORBEK lists door-panel options for 15 × 15, 15 × 18 and 18 × 18-inch openings. The controls are its clearest day-to-day advantage, while the separate door panel is an important addition to your installation budget.
Best for a Thermostat-Controlled Retrofit – Furrion 2.4 GPM Tankless Water Heater
For shoppers comparing rv tankless water heaters to replace a limited-capacity tank unit, this Furrion model offers a stated 2.4 GPM flow and 60,000 BTU propane output. Its included wall thermostat gives you a dedicated place to set and view water temperature.
Best For: RV owners who want a retrofit-oriented heater with an included wall thermostat.
Pros:
- Designed to retrofit tank water heaters in a variety of sizes.
- Vortex premixing technology is intended to reduce temperature swings.
- Includes a wall thermostat and safety features such as over-temperature protection and automatic shutoff.
Cons:
- Its stated 2.4 GPM flow is lower than the other two models here.
- At 34.1 pounds, it is heavier than the listed APUS model.
The Furrion’s thermostat and retrofit focus make it worth considering when ease of operation matters more than the highest stated flow. Check your RV’s available space and mounting requirements before treating it as a direct replacement.
How We Picked These Rv Tankless Water Heaters
We focused on RV-oriented propane models and compared the specifications most likely to affect a purchase: listed heat input and flow, 12V DC requirements, door options, controls, and cold-weather features. Several entries are closely related variants, so a different color or model suffix should not be mistaken for a different level of performance. Published flow ratings are a starting point, not a guarantee of shower flow: incoming water temperature and the temperature rise you need both matter.
Quick Comparison
For higher listed heat input, compare the 68,000 BTU APUS options with the 65,000 BTU Ranein models; both families include listings rated at 3.9 GPM. If you are comparing door finishes, APUS offers white and black versions. The Ranein RA65LH and RA65EH have similar headline ratings, so check their respective dimensions, controls, and installation documentation rather than choosing by model name alone.
The FOGATTI lineup offers several InstaShower configurations, including the 9 Pro with a built-in mixing tank and two 8 Plus listings. Check which features and accessories belong to the exact listing you plan to buy. ORBEK is another propane, 12V DC option, while the listed Furrion pairs a 60,000 BTU rating and 2.4 GPM specification with a wall thermostat and antifreeze protection. Compare all flow figures under equivalent conditions before treating them as directly interchangeable.
Key Buying Factors for Rv Tankless Water Heaters
Fit, Venting, and Installation
Measure the existing cutout and mounting space, then check the required door, venting arrangement, service clearances, and whether installation parts are included. A matching exterior finish does not mean a heater will fit the opening. Follow the manufacturer’s instructions and applicable codes; use a qualified installer for gas work if you are unsure.
Water Delivery and Fuel
Check minimum activation flow and water-pressure requirements as well as the advertised maximum flow. A pump that cycles or delivers too little water may prevent stable operation. Match the unit’s propane requirements to your regulator and supply, and remember that colder inlet water generally reduces the hot-water flow available at your desired shower temperature.
Electrical Power and Freezing
Many RV propane heaters still need 12V DC power for ignition and controls. Confirm wiring and power requirements, especially for off-grid use. Antifreeze protection may depend on an active propane and electrical supply and is not a substitute for winterization when the RV is stored or left unpowered.
Who Should Buy Which Rv Tankless Water Heaters?
Start with a confirmed cutout fit and manufacturer-approved installation, then choose among compatible units. Consider the APUS or Ranein listings if their published higher flow and heat-input figures suit your needs; compare the exact operating conditions before paying more for a rating. Look at the FOGATTI 9 Pro if its mixing-tank design appeals to you, or the 8 Plus and InstaShower 7 if their particular features and fit make more sense. The Furrion is worth a look if its thermostat and stated antifreeze feature match your setup; ORBEK belongs on the shortlist if its 12V DC installation specifications align with your rig. For any of these Rv Tankless Water Heaters, the best choice is the one you can install correctly and operate reliably with your RV’s water, fuel, and power supplies.
