Buying Guide
6 Best 6 Gallon RV Water Heater in 2026: A Practical RV Guide
Best 6 gallon RV water heaters compared on anode-free tanks, ignition type and a 120V mini-tank option for small RVs and tight compartments.
By Hardcastle's RV Editors
10 min read6 products evaluated
A 6 gallon tank is the standard heater in many compact travel trailers and camper vans, so the shortlist is mostly about gas-only versus gas and electric and about whether the tank needs an anode. A 120V point-of-use tank is included for owners who want electric hot water at one sink.
Each heater was compared on what its listing states: tank material, ignition, electric element, dimensions and warranty, with fit checked against the opening before buying.
Hardcastle’s RV field notes
The Rig Fit Check
A quick way to connect the shortlist to the space, workload and ownership details that matter after the box arrives.
- Start with the job
- WH-6GEA RV Gas and Electric Water Heater leads this shortlist for Low-maintenance buyers. Use that fit as a reference point, then compare the alternatives against your own space and workload.
- Specs that separate the picks
- The first details to compare are Aluminum tank, no anode, DSI and electric element, Direct spark ignition. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Aluminum differs from steel tanks
The Practical Shortlist
A road-tested-thinking look at 6 options, organized around the job each one suits best.
Best Anode-Free Gas and Electric
WH-6GEA RV Gas and Electric Water Heater
Low-maintenance buyers
Our take Check price for WH-6GEA RV Gas and Electric Water Heater (opens in a new tab)
Best Gas and Electric Steel Tank
Suburban SW6DE 6-Gallon RV Water Heater
Suburban replacement buyers
Our take Check price for Suburban SW6DE 6-Gallon RV Water Heater (opens in a new tab)
Best Gas-Only Value
Suburban SW6D 6-Gallon RV Water Heater
Gas-only buyers
Our take Check price for Suburban SW6D 6-Gallon RV Water Heater (opens in a new tab)
Best Anode-Free Gas Only
Dometic WH-6GA 6-Gallon Water Heater
Low-maintenance gas buyers
Our take Check price for Dometic WH-6GA 6-Gallon Water Heater (opens in a new tab)
Best Hybrid Value
KINGRVER 6 Gallon RV Tank Water Heater
Budget hybrid buyers
Our take Check price for KINGRVER 6 Gallon RV Tank Water Heater (opens in a new tab)
Best Electric Point-of-Use
CAMPLUX Electric Hot Water Heater 6 Gallons
Electric-only buyers
Our take Check price for CAMPLUX Electric Hot Water Heater 6 Gallons (opens in a new tab)
Why Each Pick Made the Cut
Best Anode-Free Gas and Electric1 of 6
WH-6GEA RV Gas and Electric Water Heater on Amazon (opens in a new tab)
WH-6GEA RV Gas and Electric Water Heater makes the shortlist because no anode rod to maintain.
Best for
- Low-maintenance buyers
Why it made the shortlist
The Elk Mountain WH-6GEA is a 12 volt gas and electric 6 gallon heater with an aluminum tank that needs no anode rod. Its listing gives compact dimensions of 16 by 16 by 14 inches.
It targets longer showers and filling large containers.
Best for small-rig owners who want electric backup and no anode. It also suits tight compartments.
Key dimensions & specs
- Aluminum tank, no anode
- Gas and electric
- 16 by 16 by 14 inches
Pros
- No anode rod to maintain
- Gas and electric operation
- Compact 16 by 16 by 14 inch size
- 12 volt ignition
Cons
- Aluminum differs from steel tanks
Best Gas and Electric Steel Tank2 of 6
Suburban SW6DE 6-Gallon RV Water Heater on Amazon (opens in a new tab)
The strongest case for Suburban SW6DE 6-Gallon RV Water Heater is gas and electric in one tank.
Best for
- Suburban replacement buyers
Why it made the shortlist
The Suburban SW6DE (5239A) is a 6 gallon heater with direct spark ignition and an electric element. It has a porcelain-lined steel tank, a replaceable anode rod and Suburban's flue tube design.
Compared with the SW6D, it adds electric heating for campsite or generator power. It sits below the Elk Mountain in price.
A great pick for owners who want gas and electric in a proven steel tank. It also suits Suburban replacements.
Key dimensions & specs
- DSI and electric element
- Porcelain-lined steel tank
- Replaceable anode rod
Pros
- Gas and electric in one tank
- Replaceable anode rod
- Direct spark ignition
- Flue tube heat transfer
Cons
- Anode needs regular checks
Best Gas-Only Value3 of 6
Suburban SW6D 6-Gallon RV Water Heater on Amazon (opens in a new tab)
Suburban SW6D 6-Gallon RV Water Heater is the better fit when gas-only buyers.
Best for
- Gas-only buyers
Why it made the shortlist
The Suburban SW6D (5238A) is a 6 gallon direct spark ignition heater with a porcelain-lined steel tank and a replaceable anode rod. It is the lowest-priced Suburban 6 gallon tank here.
It drops the electric element of the SW6DE and keeps the same flue tube design.
Best for budget replacements that run on propane. It also suits seasonal campers.
Key dimensions & specs
- Direct spark ignition
- Steel tank
- Replaceable anode rod
Pros
- Direct spark ignition
- Replaceable anode rod
- Flue tube design
Cons
- No electric element
- Gas-only operation
Best Anode-Free Gas Only4 of 6
Dometic WH-6GA 6-Gallon Water Heater on Amazon (opens in a new tab)
Choose Dometic WH-6GA 6-Gallon Water Heater for anode rod not required.
Best for
- Low-maintenance gas buyers
Why it made the shortlist
It uses LP gas as its energy source.
Compared with the Elk Mountain WH-6GEA, it skips electric heating and costs less. The listing notes the door is sold separately.
Key dimensions & specs
- Electronic ignition burner
- No anode rod
- LP gas only
Pros
- Anode rod not required
- Electronic ignition
- Lower maintenance
Cons
- Door sold separately
- No electric heating
Best Hybrid Value5 of 6
KINGRVER 6 Gallon RV Tank Water Heater on Amazon (opens in a new tab)
KINGRVER 6 Gallon RV Tank Water Heater makes the shortlist because 12,000 BTU burner.
Best for
- Budget hybrid buyers
Why it made the shortlist
The KINGRVER 6 Gallon RV Tank Water Heater is a propane and electric hybrid with a 12,000 BTU burner and a porcelain-lined steel tank. Its listing describes remote temperature control from inside the RV and three heating modes.
It costs less than both the Elk Mountain and Suburban SW6DE while adding an interior control. Hybrid mode speeds recovery at peak use.
Best for owners who want an interior control at a lower price. It also suits budget swaps.
Key dimensions & specs
- 12,000 BTU burner
- Propane, electric or hybrid
- Interior remote control
Pros
- 12,000 BTU burner
- Interior remote temperature control
- Three heating modes
Cons
- Less brand history
- Check cutout size
Best Electric Point-of-Use6 of 6
CAMPLUX Electric Hot Water Heater 6 Gallons on Amazon (opens in a new tab)
The strongest case for CAMPLUX Electric Hot Water Heater 6 Gallons is uL approval stated.
Best for
- Electric-only buyers
Why it made the shortlist
The CAMPLUX 6 Gallon is a 120V 1440W point-of-use mini tank with built-in insulation foam and a glass-lined tank. The listing says it has UL approval and a thermostat with three levels from 50 to 149 F.
Unlike the gas options, it plugs into a 120V outlet and mounts on a wall or floor under a sink. It costs less than half of the Elk Mountain.
A smart pick for conversions, tiny homes and booster use. It also suits propane-free rigs.
Key dimensions & specs
- 120V 1440W mini tank
- UL approval stated
- Wall or floor mount
Pros
- UL approval stated
- Built-in insulation foam
- Three temperature levels
- Wall or floor mounting
Cons
- Electric only
- Not a drop-in for a gas heater cutout
How We Built This Shortlist
Each pick was assessed across 4 criteria weighted for real-world use.
- 6 gallon match
- Only listings naming a 6 gallon tank were included.
- Fuel and ignition
- Gas only, gas and electric and 120V electric were separated.
- Tank material
- Steel with anode and aluminum without anode were compared.
- Fit
- Dimensions and door notes were weighed.
What Matters Before You Choose a 6 Gallon RV Water Heater
Key buying criteria so you get the right fit the first time.
Anode vs aluminum
Steel tanks rely on an anode that you replace, while aluminum tanks need none. It matters for yearly upkeep. Check which the listing states.
Gas vs gas and electric
An electric element saves propane at full hookups. It matters for cost on long stays. Check whether the element is included.
Ignition
Direct spark and electronic ignition remove the pilot light. It matters for reliability in wind. Look for DSI or electronic ignition.
Compartment fit
A 6 gallon tank is compact, but sizes vary. It matters because a wrong fit means rework. Compare stated dimensions to your opening.
12V and 120V needs
Gas heaters need 12V and the element needs 120V. It matters when boondocking. Check which supply each mode uses.
Match a 6 Gallon RV Water Heater to Your RV
By your power setup
| Your situation | Recommended pick | Why |
|---|---|---|
| Gas, electric and no anode | Elk Mountain WH-6GEA | Aluminum tank with electric heating |
| Gas and electric in steel | Suburban SW6DE | DSI plus electric element |
| Gas only, lowest cost | Suburban SW6D | Direct spark, no electric element |
| Gas only, no anode | Dometic WH-6GA | Electronic ignition without anode |
| Electric at one sink | CAMPLUX 6 Gallon | 120V UL approval stated |
Scroll sideways to see every column.
By Budget
| Budget | Recommended pick |
|---|---|
| $210 to $440 | CAMPLUX 6 Gallon or Suburban SW6D |
| $460 to $500 | KINGRVER 6 Gallon or Suburban SW6DE |
| $520 to $600 | Dometic WH-6GA or Elk Mountain WH-6GEA |
Steel with anode vs aluminum without
- Steel with anode
- The Suburban SW6DE and Suburban SW6D use porcelain-lined steel with a replaceable anode.
- Aluminum without anode
- The Elk Mountain WH-6GEA and Dometic WH-6GA use aluminum tanks that need no anode.
Most buyers should choose an anode-free tank such as the Dometic WH-6GA.
By hot water habits
| Habit | Recommended pick |
|---|---|
| Quick showers, hybrid | KINGRVER 6 Gallon |
| Long showers | Elk Mountain WH-6GEA |
| Gas only | Suburban SW6D |
| Booster at a sink | CAMPLUX 6 Gallon |
For Camper Vans and Small Trailers Specifically
- Look for
- compact dimensions and low maintenance
- In this comparison
- The Elk Mountain WH-6GEA lists 16 by 16 by 14 inches and the Dometic WH-6GA needs no anode.
When to Spend More
- Spend more if
- Spend more if you want electric heating and no anode: the Elk Mountain WH-6GEA offers both.
- Save if
- Save if you only need gas: the Suburban SW6D and Dometic WH-6GA cost less.
Before You Bring One Home
Will a 6 gallon heater fit my RV?
Check the stated dimensions, such as 16 by 16 by 14 inches on the Elk Mountain WH-6GEA, against your opening. Measure the door and depth before ordering.
What mistake do people make?
Buying a gas-only heater when they want electric backup. Check the model suffix and the listing.
Is the Suburban SW6DE worth it over the SW6D?
If you camp with hookups, the electric element saves propane. For gas-only use, the SW6D costs less.
How do I install a 6 gallon heater?
Shut off gas and power, drain the old tank, connect water and gas lines and test for leaks. Follow the maker's instructions.
How do I maintain it?
Check the anode on steel tanks each year and flush sediment. Winterize before freezing weather.
Bottom Line
Best overall: WH-6GEA RV Gas and Electric Water Heater — best anode-free gas and electric pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all 6 gallon rv water heater on Amazon — Prime-eligible options with current pricing.