For off-grid RV travel, a tankless water heater can provide hot water without keeping a tank heated between uses. The right choice depends on more than propane output: check whether the unit needs 12-volt power or batteries, whether it fits your RV’s opening, and how much water it can heat for your showers and dishes. These five options range from built-in RV replacements to portable outdoor heaters, so match the design to how and where you camp.
| Product | Best for | Heat output and flow | Power and installation |
|---|---|---|---|
| KINGRVER SUMMIT XT RV Tankless Water Heater | Built-in replacement with steadier temperature | 65,000 BTU; up to 3.8 GPM | Propane; 12V DC; built-in |
| ORBEK RV Tankless Water Heater | RV replacement with altitude mode | 60,000 BTU | Propane; 12V DC; standard RV connections |
| 65,000 BTU RV Tankless Water Heater with Door | Compact RV installation and outdoor water access | 65,000 BTU | Propane; 12V DC; 15-by-15-inch door |
| Ranein 6L Portable Propane Tankless Water Heater | Portable showers and rinsing | 41,000 BTU; 1.58 GPM | Propane; portable outdoor setup |
| CAMPLUX 4.22 GPM Propane Tankless Water Heater | Higher-flow outdoor hot water without AC power | 110,000 BTU; up to 4.22 GPM | Propane; two D batteries; outdoor setup |
Table of Contents
Our Picks: Best Rv Tankless Water Heaters For Off Grid reviews
1. KINGRVER SUMMIT XT: Built-In RV Heater with Temperature Mixing
The SUMMIT XT is a propane-powered, built-in RV heater designed to replace many standard tank or tankless units. It produces up to 65,000 BTU and lists a maximum flow rate of 3.8 GPM. Its standout feature is an integrated mixing chamber intended to help smooth temperature changes when water is being used.
The wired controller lets you set the temperature from inside the RV, with an adjustment range of 95°F to 123°F. It also includes a high-altitude mode rated for operation up to 9,800 feet. The heater uses 12V DC power, so it still needs a suitable RV electrical supply even though propane does the water heating.
This is the most appealing pick here if you want a permanent installation and are concerned about fluctuating shower temperatures. Check your existing opening before ordering: compatible door kits are available in several sizes, but the doors are sold separately. At 20.1 pounds, it is also heavier than the portable choices.
Pros:
- Mixing chamber is designed to reduce hot-and-cold swings.
- Up to 3.8 GPM and 65,000 BTU for everyday RV hot-water use.
- Indoor wired controller with adjustable temperature.
- High-altitude mode and listed frost-protection features.
Cons:
- Needs 12V DC power as well as propane.
- Matching door kit is sold separately, so confirm the cutout and door size.
Verdict: Choose the SUMMIT XT if you want a built-in RV replacement with a mixing chamber and remote temperature control, and your rig has the right opening and 12V supply.
2. ORBEK RV Tankless Heater: Replacement Option with Altitude Mode
This ORBEK model is a propane-fired RV replacement heater with a 60,000 BTU burner. It runs on 12V DC and uses standard NPT water connections, according to the product details. That makes it a built-in option to consider when you are upgrading an existing RV water-heater installation rather than looking for a portable shower unit.
Its listed features include high-altitude suitability up to 9,800 feet, an oxygen-free copper heat exchanger, and staged combustion intended to help manage temperature. A wired smart remote adjusts the set temperature from 95°F to 123°F. The product also lists a built-in 150 PSI pressure-reducing valve.
As with any replacement, the advertised compatibility does not remove the need to measure your cutout and verify plumbing, gas, and electrical connections. Optional door panels are sold separately. The listing does not provide a flow-rate figure in the supplied product details, so it is harder to compare its water delivery directly with models that list GPM.
Pros:
- 60,000 BTU propane burner for on-demand RV hot water.
- High-altitude mode is listed for use up to 9,800 feet.
- Remote temperature adjustment from 95°F to 123°F.
- Built-in pressure-reducing valve is included.
Cons:
- Requires 12V DC power in addition to propane.
- The supplied details do not state a maximum flow rate.
Verdict: The ORBEK is worth considering for a built-in RV replacement if altitude support and a pressure-reducing valve matter to you, but verify fit and ask for flow details before choosing it over a model with a published GPM rating.
3. 65,000 BTU RV Heater: Compact Fit with an Exterior Water Outlet
This propane-powered RV tankless heater offers 65,000 BTU output and uses 12V DC power. The supplied details describe a compact unit intended for an opening as small as 13 by 13 inches, with a 15-by-15-inch exterior door. Measure both the cutout and the door area on your RV before assuming it will fit.
A useful distinction is its internal and external water outlets. The outside outlet can supply water for tasks such as rinsing gear or bathing a pet without routing the water through an indoor faucet. The heater also has a digital control panel, temperature adjustment from 95°F to 123°F, and listed high-altitude capability.
Its 65,000 BTU output puts it in the same general range as the KINGRVER, but the KINGRVER lists a higher maximum flow rate and a mixing chamber. This model’s exterior outlet may be more useful if outdoor water access is a priority. It is still a fixed RV installation, not a grab-and-go portable heater.
Pros:
- 65,000 BTU propane heating with temperature adjustment.
- Internal and external water outlets for different RV uses.
- Compact installation dimensions are specified in the listing.
- Includes a 15-by-15-inch black door.
Cons:
- Needs 12V DC power and a permanent RV installation.
- Listed product details do not give a maximum GPM figure.
Verdict: Pick this model if you want a built-in heater with an exterior water outlet and its specified door size suits your RV; consider the KINGRVER if published flow rate and a mixing chamber are higher priorities.
4. Ranein 6L Portable Heater: A Simple Option for Outdoor Showers
The Ranein is a portable propane heater rated at 41,000 BTU and 1.58 GPM. Its compact design includes a hanging chain and mounting bracket, and the package lists a showerhead, gas regulator with hose, adapters, and hardware. Those parts make it suited to temporary outdoor hot-water setups rather than replacing an RV’s built-in heater.
Its listed temperature range is 55.4°F to 109.4°F, with a low-water-pressure start-up rating of 3.6 PSI. The safety features include overheat, dry-combustion, and low-flow protection, along with an anti-freeze drain plug. Use it outdoors as directed; it is not a substitute for a properly installed indoor RV appliance.
The relatively modest 1.58 GPM rating is a practical limit to keep in mind. It may suit a single outdoor shower or rinse station, but it is not the strongest choice for running several hot-water outlets. Compared with the CAMPLUX, it has much lower listed heat output and flow, but it is a lighter portable option.
Pros:
- Portable design with a showerhead and setup accessories listed in the package.
- Starts at a listed water pressure of 3.6 PSI.
- Includes a drain plug for freeze protection.
- Temperature and water flow are adjustable.
Cons:
- 1.58 GPM is lower than the flow ratings of the built-in options and CAMPLUX.
- Designed for outdoor use, not as a built-in RV replacement.
Verdict: Choose the Ranein for a portable outdoor shower or rinse setup when low-pressure start-up and a compact package matter more than high flow.
5. CAMPLUX 4.22 GPM Heater: High-Flow Outdoor Hot Water Without AC
The CAMPLUX is a portable outdoor propane heater with a listed output of 110,000 BTU and a maximum flow rate of 4.22 GPM. Unlike the built-in RV models in this list, it uses two D batteries rather than requiring AC power. You still need propane and a water supply; the listing says a pump is also needed if you draw water from a tank.
The package includes a rain cap, gas regulator, shower kit, hardware, and manual. Temperature and flow can be adjusted with separate controls. The product details list a maximum temperature of 167°F, so use careful temperature control and follow the instructions to avoid scalding.
This heater is a strong fit for outdoor showers, remote campsites, and other setups where you do not want to cut into the RV for a built-in replacement. Its outdoor design is also a limitation: it is not presented as an indoor RV appliance. Compared with the Ranein, it has substantially higher listed BTU output and GPM, but it is larger and requires a separate water source setup.
Pros:
- Up to 4.22 GPM and 110,000 BTU for outdoor hot-water use.
- Runs on propane and two D batteries without AC power.
- Includes a rain cap, regulator, and shower kit.
- Temperature and water flow can be adjusted.
Cons:
- For outdoor use rather than a built-in RV installation.
- Requires a water inlet hose, propane cylinder, and batteries; a tank-fed setup also needs a pump.
Verdict: The CAMPLUX is the most compelling option here for higher-flow outdoor hot water without AC power, provided you have a safe outdoor location and the water-source equipment it needs.
How to Choose an RV Tankless Water Heater for Off-Grid Use
Decide between a built-in unit and a portable heater
A built-in RV heater is the better fit when you want hot water at the RV’s plumbed faucets and are replacing an existing appliance. A portable outdoor heater can be more flexible for campsite showers, pet rinsing, or gear cleanup, but it needs a separate setup and is not interchangeable with an indoor RV unit. Choose the type that matches where you need hot water, not just the one with the biggest output number.
Check the electrical requirement
Propane heats the water in these models, but some built-in heaters also require 12V DC power for operation. That matters when you are off-grid and managing battery use. The CAMPLUX listing specifies two D batteries and no AC power requirement, while the built-in models listed here use 12V DC. Confirm the power requirement in the complete product instructions before installation.
Match flow rate to your water use
GPM describes how much water a heater can deliver, but your experience also depends on incoming water temperature and the conditions of use. A single outdoor shower may work with a lower flow rate, while multiple outlets or a stronger shower call for more capacity. Do not compare BTU alone: look for both heat output and flow rate, and note that some listings do not provide a GPM figure.
Measure the RV opening and verify connections
For a built-in replacement, measure the existing cutout and exterior door area, then compare them with the heater’s specified dimensions. Check water connections, propane requirements, and electrical supply as well. A door panel may be sold separately, so confirm what is included rather than assuming the heater will arrive with a matching exterior door.
Plan your water source and pump
An on-demand heater still needs water flowing through it. If your RV’s plumbing is not supplying water, a portable setup may require an inlet hose and a pump, depending on how you draw from your water container. The CAMPLUX listing specifically calls for a pump when using a water tank. Account for water use as part of your off-grid plan, not just propane and power.
Consider altitude, temperature control, and safety
If you travel in the mountains, check whether the heater lists high-altitude operation and what altitude it supports. Temperature controls can help you set a comfortable output, while features such as overheat protection, automatic gas shutoff, or freeze protection vary by model. Follow the manufacturer’s installation and operating instructions, keep outdoor-only units outdoors, and take steps to protect the heater from freezing when it is not in use.
Frequently Asked Questions
Can an RV tankless water heater work off-grid?
Yes. These models use propane to heat water, but some built-in units also need 12V DC power. The CAMPLUX uses two D batteries and does not require AC power, according to its product details. You also need a working water supply, and some setups may need a pump.
Which option is best if I want a permanent RV installation?
The KINGRVER, ORBEK, and 65,000 BTU model with a door are the built-in choices in this list. Compare their fit, power requirements, and controls with your current installation. The KINGRVER lists both a maximum flow rate and an integrated mixing chamber.
Which heater is best for an outdoor shower?
The CAMPLUX and Ranein are both described as portable outdoor options. The CAMPLUX has the higher listed maximum flow rate, while the Ranein is a lower-flow alternative with a compact portable setup and a listed low-pressure start-up rating.
Do tankless RV water heaters need electricity?
Some do. The built-in models listed here specify 12V DC power. The CAMPLUX is listed as running on two D batteries without AC power. Check the exact model’s electrical requirements, since propane operation does not automatically mean the unit needs no electricity.
Will a built-in tankless heater fit my RV?
Not necessarily. Measure your existing cutout and door area, and check the heater’s required dimensions and connection types. A product described as compatible with standard RV openings may still need a separate door panel or other installation parts.
Can I use a portable outdoor heater inside my RV?
Do not treat an outdoor portable heater as an indoor appliance. The Ranein and CAMPLUX are presented as outdoor-use products. Follow each manufacturer’s placement and safety instructions, and choose a properly designed built-in unit for indoor RV plumbing.
Final Recommendation
For a built-in off-grid RV upgrade, the KINGRVER SUMMIT XT stands out for its mixing chamber, published flow rate, and indoor remote control, provided your RV has the right opening and 12V supply. For portable outdoor hot water without AC power, the CAMPLUX offers the highest listed flow in this group but needs batteries, propane, and a suitable water source. Measure carefully and choose based on where you need hot water, how much flow you want, and what your off-grid power setup can support.
