If you’re searching for the best RV tankless water heater that runs on gas and electric, first check whether you want a true on-demand heater or a hybrid tank model. The products below include both: the propane-only tankless options heat water as it flows, while the gas-and-electric models store hot water in a six-gallon tank. That distinction affects hot-water capacity, power needs, installation, and how well each unit fits your RV.
For a gas-and-electric replacement, the FOGATTI HybridShower 6 Ultra and CAMPLUX 6 Gallon are strong places to start. If you want on-demand hot water and can use propane, consider the FOGATTI InstaShower 8 Plus or Ranein. Check your RV’s cutout, door size, plumbing, and power supply before choosing; a similar-looking heater may not be a direct fit.
Table of Contents
Quick Comparison
| Product | Type and power | Capacity or output | Best for |
|---|---|---|---|
| KINGRVER 6 Gallon RV Water Heater | Tank; propane, electric, or hybrid | 6-gallon tank; 12,000 BTU | Owners seeking three heating modes and remote control |
| FOGATTI InstaShower 8 Plus | Tankless; propane | Up to 2.9 GPM, according to the product description | Propane-powered on-demand hot water |
| FOGATTI HybridShower 6 Ultra | Tank; propane, electric, or hybrid | 6-gallon tank; 12,000 BTU propane burner | A hybrid replacement for compatible Suburban or Dometic units |
| CAMPLUX 6 Gallon RV Water Heater | Tank; propane, electric, or hybrid | 6-gallon tank; 12,000 BTU | Hybrid heating with an advertised standard cutout fit |
| Ranein RV Tankless Water Heater | Tankless; propane | Up to 3.9 GPM; 65,000 BTU | Higher stated flow for RVers who want on-demand heating |
Our Picks: Best Rv Tankless Water Heater Gas And Electric reviews
1. KINGRVER 6 Gallon: Three Heating Modes in a Compact Tank
The KINGRVER is a six-gallon storage water heater, not a tankless unit. Its main appeal is flexibility: you can heat water with propane, 120V AC electricity, or both in hybrid mode. Propane operation uses the RV’s 12V DC power for ignition. The included controller lets you select a mode and set the temperature from 104°F to 140°F.
The porcelain-lined steel tank and four-layer construction are designed to help retain heat and provide steady hot water. At 21 inches deep, it also needs room behind the opening for connections. The manufacturer describes it as a replacement option for common Suburban, Atwood, and Dometic setups, but measure your existing compartment and confirm the installation requirements before ordering.
This model makes the most sense if you want gas-and-electric operation and prefer a stored supply of hot water. Some owners report that it fits existing compartments and is manageable to install, though the remote wire may be short for certain layouts. It offers more heating-mode choice than the propane-only tankless models here, but it still has a finite six-gallon tank.
Pros:
- Offers propane, electric, and combined heating modes.
- Includes a remote for mode and temperature adjustments.
- Designed for common 4–6 gallon RV heater replacements.
- Hybrid operation can help recover hot water more quickly.
Cons:
- It is a tank heater, not a true tankless model.
- Requires space for its 21-inch depth and plumbing connections.
Verdict: Choose the KINGRVER if you want a three-mode, six-gallon replacement and your RV has room for its specified dimensions.
2. FOGATTI InstaShower 8 Plus: Propane Tankless Heating for RVs
Unlike the hybrid tank models, the FOGATTI InstaShower 8 Plus heats water on demand using liquid propane. Its product description lists a flow rate of up to 2.9 gallons per minute and a 55,000 BTU output. It uses 12V DC power and includes a remote controller with a listed temperature range of 95°F to 123°F.
Features include staged combustion intended to help keep temperatures more consistent, a high-altitude mode, antifreeze protection, and a pressure-relief valve. The product information lists several installation door options, but they are sold separately. Check the opening and door dimensions for your RV rather than assuming this will fit an existing tank-heater compartment.
This is a propane-only choice, so it does not provide electric heating at a campground. It may suit RVers who specifically want a tankless system and are comfortable relying on propane. Its stated flow rate is lower than the Ranein’s, while its temperature controls and stated altitude capability may be useful for varied travel conditions.
Pros:
- Heats water on demand rather than storing it in a tank.
- Includes a remote controller and adjustable temperature range.
- Lists antifreeze protection, a pressure-relief valve, and high-altitude mode.
- Product description states up to 2.9 GPM flow.
Cons:
- Uses propane and does not offer electric heating.
- Installation door options are sold separately, and fit must be checked.
Verdict: Consider the InstaShower 8 Plus if you want a propane tankless heater with a remote and do not need electric operation.
3. FOGATTI HybridShower 6 Ultra: A Gas-and-Electric Tank Replacement
The FOGATTI HybridShower 6 Ultra is a six-gallon tank heater that can run on propane, electricity, or both. Use propane when you are away from hookups, electric power at a suitable campground connection, or dual-fuel mode when you want faster recovery. Its 12,000 BTU propane burner is a notable feature for a compact RV tank heater.
The porcelain-lined steel tank is paired with a powered anode rod, which is designed to help protect against corrosion. The product is described as a direct replacement for compatible Suburban and Dometic units, with a listed 15-by-15-inch door option. Confirm your RV’s opening, depth, door setup, and electrical requirements before buying; “direct replacement” does not guarantee a fit in every model.
This is the closest match among the picks for shoppers who specifically want gas-and-electric heating in a replacement tank. It is not tankless, so it stores a limited amount of hot water. Compared with the CAMPLUX, it highlights a powered anode rod and a 12,000 BTU propane burner, while the CAMPLUX listing gives more detail about its standard cutout dimensions.
Pros:
- Supports propane, electric, and combined heating.
- Includes a powered anode rod and porcelain-lined tank.
- Designed as a replacement option for compatible Suburban and Dometic heaters.
- 12,000 BTU propane burner is specified.
Cons:
- It stores water in a six-gallon tank rather than heating it continuously on demand.
- You must verify the door and installation dimensions for your RV.
Verdict: Pick the HybridShower 6 Ultra if you want a hybrid tank replacement with corrosion-protection features and a verified compatible opening.
4. CAMPLUX 6 Gallon: Hybrid Heating With a Stated Standard Cutout
The CAMPLUX is another six-gallon storage heater with propane, electric, and hybrid modes. Its product description says it is designed for many 4–6 gallon Suburban and Dometic replacements, with a 13-by-13-inch cutout and 15-by-15-inch exterior door. It uses 12V DC ignition and 120V AC heating, and the listing specifies a 12,000 BTU output.
A porcelain-lined steel tank, anode rod, drain valve, and built-in safety protections are included in the product details. The inside control lets you select a heating mode and adjust the temperature without going outside. Its stated dimensions differ from some of the other options, so compare the full measurements and required clearance with your RV before ordering.
Owners have described successful replacement installs and appreciate being able to choose propane or electric depending on the campsite. As with other tank heaters, hot-water supply is limited by the tank and recovery time. This is a practical option if you want a hybrid unit and the advertised cutout dimensions match your compartment.
Pros:
- Offers propane, electric, and hybrid operation.
- Lists a 13-by-13-inch cutout and 15-by-15-inch exterior door.
- Includes a drain valve for winterization and an anode rod.
- Allows mode and temperature adjustment from inside the RV.
Cons:
- It is a six-gallon tank model, not a tankless heater.
- Actual fit depends on your RV’s opening, door, and connection layout.
Verdict: The CAMPLUX is a good hybrid replacement to consider when its stated cutout and door dimensions match your RV.
5. Ranein RV Tankless: High Stated Flow for Propane-Only Use
The Ranein is a propane-powered, on-demand RV water heater. Its product description lists a 65,000 BTU burner and flow of up to 3.9 gallons per minute. A thermostatic mixing chamber and staged combustion are intended to help manage temperature as demand changes. The remote displays operating details such as water flow and system voltage.
The listing says the unit is designed for a 12.8-by-12.8-inch cutout and can be used with several common tank-heater setups, subject to dimensions. Exterior door kits are optional and sold separately. It also lists high-altitude operation up to 9,800 feet, but you should confirm the installation requirements and your RV’s propane and water systems before replacing an existing heater.
Some owners describe successful installations and appreciate having hot water available for back-to-back showers. However, installation is not always plug-and-play; plumbing layouts, framing, and old fittings can require changes. Its higher stated flow makes it worth comparing with the FOGATTI tankless option, but neither provides electric heating.
Pros:
- Lists up to 3.9 GPM and a 65,000 BTU propane burner.
- Uses on-demand heating rather than a storage tank.
- Remote provides operating information and temperature control.
- Product description states suitability for elevations up to 9,800 feet.
Cons:
- Propane-only; it does not heat with campground electricity.
- Exterior door kits are sold separately, and installation may need adjustments.
Verdict: Choose the Ranein if you want a propane tankless model with a higher stated flow rate and have confirmed that its cutout and door setup suit your RV.
How to Choose an RV Water Heater
Decide Between Tankless and Tank Heating
A tankless heater warms water as it flows through the unit, so it does not rely on a stored six-gallon supply. A tank heater stores hot water and may need time to recover after use. Tankless does not automatically mean unlimited hot water at any flow or temperature: performance depends on the unit, incoming water temperature, and how much water you use at once. Choose the type that suits your shower habits and RV setup.
Check Whether You Need Gas, Electric, or Both
In these listings, gas operation means propane. The hybrid tank models can use propane, 120V AC electricity, or both, while the two tankless options listed here are propane-powered. Electric mode needs an appropriate AC power supply, and propane systems may use the RV’s 12V DC power for ignition and controls. If you specifically need an electric tankless heater, none of these five listings is described as one.
Measure the Cutout, Door, and Installation Depth
Measure the existing opening and exterior door, then check the new unit’s width, height, and depth. Also account for room behind the heater for plumbing connections and clearance. Door kits may be optional or sold separately, and a heater advertised as a replacement may still need adjustments to fit your particular RV. Confirm the manufacturer’s fit information before purchase.
Compare Flow Rate With Your Water Use
Tankless flow rates are listed in gallons per minute, but the stated maximum does not guarantee the same hot-water flow in every condition. Colder incoming water or several fixtures running at once can affect the experience. For tank models, capacity and recovery time matter instead. Consider whether you usually take one shower at a time or want to run more than one water fixture.
Review Safety and Cold-Weather Features
Look at the protections listed for each unit, such as pressure relief, overheating protection, dry-fire protection, flame-failure shutoff, or antifreeze features. These features do not remove the need to follow the installation and winterization instructions. Cold weather can still damage plumbing or components if the RV system is not properly prepared.
Consider Maintenance and Corrosion Protection
Tank models may use an anode rod to help protect the tank, and the FOGATTI HybridShower 6 Ultra lists a powered anode rod. The tankless models avoid storing water in a tank, but they still require proper care and winterization. Check the instructions for your chosen heater and keep access to service points in mind when planning the installation.
Plan for Installation and Compatibility
Even a replacement unit can require new fittings, wiring, framing, or plumbing adjustments. Review the connection sizes and electrical requirements, and use a qualified RV technician if you are not comfortable working with propane, electrical circuits, or water lines. A careful fit check before ordering can prevent costly changes later.
Frequently Asked Questions
Are gas-and-electric RV water heaters tankless?
Not always. In this selection, the products that offer propane and electric heating are six-gallon tank models. The two products described as tankless use propane and do not list electric heating.
Can I use electric mode when I am not connected to shore power?
The hybrid tank models list 120V AC electric heating, so you need a suitable AC power source for that mode. Check your RV’s power setup and the heater’s instructions before using it.
Does a tankless RV heater provide unlimited hot water?
It heats water on demand instead of storing a fixed tankful, but the available hot-water flow depends on the unit and operating conditions. Water temperature, flow rate, and simultaneous use can affect performance.
Will these heaters fit my existing RV opening?
Not necessarily. The products list different cutout and door dimensions, and the required depth and connections can vary. Measure your existing installation and compare it with the manufacturer’s full specifications before buying.
Do the tankless models in this list use electricity?
The FOGATTI InstaShower 8 Plus and Ranein are described as propane tankless heaters. They do not offer electric water heating. Check their installation details for the power needed to operate controls or ignition.
Which option is best for replacing a six-gallon tank heater?
The KINGRVER, FOGATTI HybridShower 6 Ultra, and CAMPLUX are all six-gallon hybrid tank models. The right choice depends on your cutout, door, depth, electrical setup, and desired features.
Conclusion
If you want both propane and electric heating, consider the FOGATTI HybridShower 6 Ultra or CAMPLUX 6 Gallon, but remember that both store water in a tank. The KINGRVER is another three-mode tank option with remote controls. If your priority is true on-demand heating, the Ranein and FOGATTI InstaShower 8 Plus are propane-only choices. Measure your RV and confirm the power and installation requirements before choosing; the best heater is the one that fits your space and matches how you camp.
