The best combo hot water heater depends on where you need hot water and whether you want propane and electric heating in one appliance. For an RV replacement, the KINGRVER 6-gallon model suits smaller tank openings, while its 10-gallon model is better for higher daily demand. The Jflapil and HeatRova are single-energy tankless alternatives, and the CAMPLUX is a portable propane shower system rather than a built-in combo heater.
| Product | Best suited for | Heating type |
|---|---|---|
| KINGRVER 6 Gallon | Compact RV replacements | Propane and electric |
| KINGRVER 10 Gallon | RV users needing more stored hot water | Propane and electric |
| Jflapil 110V Tankless | Small point-of-use installations | Electric |
| HeatRova Natural Gas Tankless | Indoor household hot water demand | Natural gas |
| CAMPLUX Nano 3 Max | Portable outdoor showers | Propane |
KINGRVER 6-Gallon RV Hybrid Water Heater
Best for: RV owners replacing a smaller tank heater who want a choice between propane, electric power, and combined operation. It is the most directly relevant option here for buyers searching for a combo hot water heater.
The 6-gallon tank has a porcelain-lined steel construction and offers three heating modes: gas only, electric only, or gas and electric together. The propane burner is listed at 12,000 BTU, and the electric element at 1,440 watts. The manufacturer says the hybrid mode supports faster recovery when hot water use increases.
Its listed dimensions are 21 by 12.8 by 12.8 inches. It is designed for many 4- to 6-gallon RV cutouts and uses standard 1/2-inch NPT water connections. The listing advises allowing at least 3 inches of additional depth for pipe connections.
Why it was selected: Dual-fuel flexibility and a compact tank make it a close match for RV shoppers comparing combo units. Limitation: Confirm cutout dimensions, depth, and connection requirements before purchase; a stated replacement fit does not guarantee fit in every RV.
KINGRVER 10-Gallon RV Hybrid Water Heater
Best for: RV households that want a larger stored-water capacity than a 6-gallon unit provides. Choose this model if your existing installation is designed for a 10-gallon heater and you value the option to use propane, electricity, or both.
The product is described as a 10-gallon RV tank heater with a porcelain-lined steel tank and dual-fuel operation. Its 12,000 BTU propane burner is intended to provide hot-water recovery for routine RV tasks such as showers and dishwashing. Combined operation is presented as an option for faster recovery during periods of higher demand.
The manufacturer says it is designed for many common 10-gallon RV heater openings and has standard water and gas connections to support replacement. Actual fit still depends on the RV’s opening, connections, and available installation space.
Why it was selected: It offers the same propane-and-electric operating choice as the smaller KINGRVER while providing a larger tank. Limitation: The supplied product details do not specify its overall dimensions, so measure the heater compartment and verify connection placement before ordering.
Jflapil 110V Electric Tankless Heater
Best for: Buyers seeking a compact electric point-of-use heater for a sink or another limited hot-water application. This is not a propane-and-electric combo heater; it is a single-energy tankless alternative.
The unit is listed as a 110V, 3,000-watt electric heater with an LED display that can show temperature in Celsius or Fahrenheit. Its stated adjustable temperature range is 82°F to 131°F, with the listed flow rates varying from 0.3 to 0.5 gallons per minute. It has a wall-mounted design intended to save floor space.
Listed safety features include overheating, dry-burn, leakage, and idle-status protections. The product description also identifies IPX4 water protection and water-electric isolation. The stated 98% thermal efficiency is a manufacturer-provided figure, not a comparison across the products in this guide.
Why it was selected: It provides an electric-only option for shoppers comparing compact, on-demand heaters. Limitation: Its listed flow rates are modest, so check whether they suit the intended fixture and household demand. It does not provide propane operation or stored hot water.
HeatRova Natural Gas Tankless Heater
Best for: Households looking for a natural-gas tankless heater rather than an RV dual-fuel tank. The product title lists a 4.3-gallon-per-minute flow rate and 102,000 BTU input, with intended use for three to four fixtures.
The listing describes an indoor, on-demand design with constant-temperature operation, a pure copper heat exchanger, and 3/4-inch NPT connectors. These specifications may make it relevant to a home installation where natural gas is available and a tankless format is preferred.
Why it was selected: It represents a household natural-gas alternative for readers whose search for a combo heater is really about comparing hot-water system types. Limitation: The supplied details do not identify electric backup or a second fuel source, so do not treat it as a propane-and-electric combo model. Confirm installation requirements and local code needs before choosing an indoor gas appliance.
CAMPLUX Nano 3 Max Portable Shower
Best for: Campers and travelers who need a portable hot-water shower setup for outdoor use. The product is described as a propane water heater paired with a rechargeable shower pump, making it distinct from a fixed RV tank replacement.
Its stated uses include camping, hiking, glamping, and vacationing. The listing identifies the system as portable and describes it as providing instant hot water. It is a practical category to consider when the priority is a movable shower system rather than supplying hot water to an RV’s installed plumbing.
Why it was selected: It gives outdoor buyers an option when portability matters more than dual-fuel operation or a larger storage tank. Limitation: The supplied information does not list flow rate, tank capacity, or detailed power specifications. It is propane-based and should not be mistaken for an electric-and-propane combo water heater.
Buying Guide: How To Choose A Combo Hot Water Heater
Do you need both propane and electric heating?
A combo heater lets you select between two energy sources, but the exact modes vary by model. The KINGRVER 6-gallon listing specifies gas-only, electric-only, and combined operation. The 10-gallon listing also describes propane, electric, and combined use. By contrast, the Jflapil is electric-only, the HeatRova is natural-gas tankless, and the CAMPLUX is a portable propane system.
For an RV, dual-fuel capability can offer flexibility when electrical power is available at a campsite or when propane is the preferred source. Check the product instructions and your RV’s electrical and gas setup before planning to operate both heating sources together.
Should you choose a 6-gallon or 10-gallon tank?
A 6-gallon model may suit a smaller RV opening or a buyer replacing a similar-size tank. A 10-gallon model stores more water, which may be useful for households with greater hot-water demand. Capacity alone does not determine how long hot water lasts: usage, incoming water temperature, heater operation, and recovery time also matter.
Match a replacement heater to the existing cutout and connections rather than choosing by tank capacity alone. The 6-gallon model lists dimensions and clearance guidance; the 10-gallon model’s supplied details do not provide dimensions, so verify them with the seller or product documentation.
Is a tankless heater a better fit?
Tankless heaters heat water as it flows instead of keeping a tank of hot water ready. They may suit point-of-use or household installations when their energy source, flow rate, and plumbing requirements fit the job. The Jflapil listing gives flow rates of 0.3 to 0.5 GPM, while the HeatRova listing states 4.3 GPM. These figures describe different product classes and should not be treated as directly interchangeable without considering installation and operating conditions.
Choose a tankless model only after checking the required fuel or electrical supply, intended number of fixtures, water connections, and installation location. Neither tankless option in this selection is identified as a propane-and-electric hybrid.
What installation details should you verify?
- Physical fit: Measure the opening, appliance depth, and room needed for pipes and service access.
- Connections: Compare water and gas connection sizes and locations with the existing system.
- Power and fuel: Confirm the required voltage, available circuit, propane or natural-gas supply, and operating mode.
- Installation setting: Distinguish an RV replacement, indoor household appliance, point-of-use heater, and portable shower system.
- Professional requirements: Check manufacturer instructions and applicable local requirements, particularly for gas and indoor installations.
Which type is best for your situation?
For an RV replacement that needs both propane and electric heating, compare the KINGRVER models first and select capacity based on the existing installation. For a small electric point-of-use need, the Jflapil is the relevant option in this group. For a natural-gas household tankless system, assess the HeatRova’s stated flow rate and installation needs. For outdoor showers, consider the portable CAMPLUX, while recognizing that it is not a fixed combo unit.
Frequently Asked Questions
What is a combo hot water heater?
A combo hot water heater in this selection uses propane and electricity as heating options. The KINGRVER models list gas-only, electric-only, and combined operation, giving RV users more than one way to heat water.
Can a combo RV heater run on electricity alone?
The KINGRVER 6-gallon model lists an electric-only mode using 120V AC power. Confirm electrical requirements and operating instructions for the exact model before use.
Is a 10-gallon RV heater always better than a 6-gallon heater?
No. A 10-gallon tank holds more water, but it must fit the RV compartment and suit the available connections. A 6-gallon unit may be the more appropriate replacement for a smaller existing installation.
Is the Jflapil tankless heater a combo unit?
No. Its supplied specifications describe a 110V electric tankless heater. They do not list propane operation or a storage tank.
Can the portable CAMPLUX replace an RV water heater?
The supplied description identifies it as a portable propane water heater and shower pump for outdoor activities. It does not identify it as a built-in RV tank replacement, so buyers should not assume it connects to an RV’s installed hot-water plumbing.
What should I check before ordering an RV replacement heater?
Check the opening dimensions, available depth, water and gas connections, electrical supply, fuel type, and the product’s installation instructions. A stated fit for common RV systems does not confirm compatibility with every model or configuration.