Buying Guide
6 Best RV Water Heater Replacement in 2026: A Practical RV Guide
Six ways to replace or repair an RV water heater: three whole units, a gas parts kit and a drain valve, matched to cutout size and failure type.
By Hardcastle's RV Editors
10 min read6 products evaluated
Replacing an RV water heater starts with what actually failed. A dead tank needs a whole unit that fits the cutout, a heater that will not light may only need an igniter and gas valve, and a leaking drain plug is a cheap valve swap.
This guide ranks six picks across those cases, from a 10 gallon hybrid to a drain valve. Measure the cutout and check the gas and electrical hookups before ordering, and note that the kit and valve are parts, not heaters, so they are ranked on how well they fit a repair.
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
- KINGRVER 6 Gallon RV Tank Water Heater leads this shortlist for Standard 6 gallon cutouts. 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 6 gal propane, DSI, 6 gal DSI, porcelain-lined, 10 gal propane and electric. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Needs about 3 inches extra clearance
The Practical Shortlist
A road-tested-thinking look at 6 options, organized around the job each one suits best.
Best Overall Tank Replacement
KINGRVER 6 Gallon RV Tank Water Heater
Standard 6 gallon cutouts
Our take Check price for KINGRVER 6 Gallon RV Tank Water Heater (opens in a new tab)
Best Established Tank
Suburban SW6D 6-Gallon RV Water Heater
Like-for-like Suburban swap
Our take Check price for Suburban SW6D 6-Gallon RV Water Heater (opens in a new tab)
Best Larger Tank Hybrid
KINGRVER 10 Gallon RV Tank Water Heater
10 gallon openings
Our take Check price for KINGRVER 10 Gallon RV Tank Water Heater (opens in a new tab)
Best Tankless Upgrade
ORBEK RV Tankless Water Heater
Tank to tankless swap
Our take Check price for ORBEK RV Tankless Water Heater (opens in a new tab)
Best Repair for No-Light Faults
AutoAlly 93844 91638 93868 RV Water Heater Kit for Atwood 6/10 Gallon
Atwood no-light repair
Our take Check price for AutoAlly 93844 91638 93868 RV Water Heater Kit for Atwood 6/10 Gallon (opens in a new tab)
Best Cheap Leak Fix
Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape
Leaking drain plug
Our take Check price for Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape (opens in a new tab)
Why Each Pick Made the Cut
Best Overall Tank Replacement1 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 sized for most 4 to 6 gallon cutouts.
Best for
- Standard 6 gallon cutouts
Why it made the shortlist
The KINGRVER 6 gallon tank heater is a propane, direct spark ignition unit sized for most 4 to 6 gallon cutouts, at 21 by 12.7 by 12.7 inches. It needs at least 3 inches of extra clearance, runs on 12V DC ignition and has a controller with three temperature levels.
Best for swapping a failed 6 gallon tank in a standard opening.
Key dimensions & specs
- 6 gal propane, DSI
- 21 x 12.7 x 12.7 inches
- 3-level remote controller
Pros
- Sized for most 4 to 6 gallon cutouts
- Remote controller with three temperature levels
- 12V DC ignition from the RV system
- Direct spark ignition
Cons
- Needs about 3 inches extra clearance
- Brand has less track record
Best Established Tank2 of 6
Suburban SW6D 6-Gallon RV Water Heater on Amazon (opens in a new tab)
The strongest case for Suburban SW6D 6-Gallon RV Water Heater is replaceable anode rod protects the tank.
Best for
- Like-for-like Suburban swap
Why it made the shortlist
The Suburban SW6D is a 6 gallon direct spark ignition heater with a porcelain-lined steel tank and a replaceable anode rod. The listing says an optional electric element can add campsite or generator power.
Against KINGRVER 10 Gal, it holds less water.
Best for a like-for-like swap with an existing Suburban.
Key dimensions & specs
- 6 gal DSI, porcelain-lined
- Replaceable anode rod
- Optional electric element
Pros
- Replaceable anode rod protects the tank
- Porcelain-lined steel tank
- Optional electric element for hookups
- Direct spark ignition
Cons
- Electric element is optional
- No remote control
Best Larger Tank Hybrid3 of 6
KINGRVER 10 Gallon RV Tank Water Heater on Amazon (opens in a new tab)
KINGRVER 10 Gallon RV Tank Water Heater is the better fit when 10 gallon openings.
Best for
- 10 gallon openings
Why it made the shortlist
The KINGRVER 10 gallon heater combines a 12,000 BTU propane burner with electric operation and can run on propane, electric or both. The listing says it fits many common 10 gallon openings with standard water and gas connections and has an indoor temperature control.
Against the ORBEK tankless, it is a tank rather than on demand.
Best for a 10 gallon opening and heavy hot water use. Measure the cutout carefully.
Key dimensions & specs
- 10 gal propane and electric
- 12,000 BTU burner
- Indoor temperature control
Pros
- Propane, electric or both modes
- 12,000 BTU propane burner
- Adjusts from inside the RV
- Standard water and gas connections
Cons
- Only fits 10 gallon cutouts
Best Tankless Upgrade4 of 6
ORBEK RV Tankless Water Heater on Amazon (opens in a new tab)
Choose ORBEK RV Tankless Water Heater for on-demand hot water, no tank to refill.
Best for
- Tank to tankless swap
Why it made the shortlist
The ORBEK RV Tankless Water Heater is a propane, 12V DC unit with a 60,000 BTU burner, oxygen-free copper heat exchangers and a high altitude mode. Door panels in black or white are sold separately for 15 by 15, 15 by 18 and 18 by 18 inch cutouts.
Against the tank heaters, it heats on demand rather than storing water, and it costs less than the 10 gallon KINGRVER.
Best for owners who want to replace a tank with an on-demand unit.
Key dimensions & specs
- 60,000 BTU propane, 12V DC
- Oxygen-free copper exchangers
- High altitude mode
Pros
- On-demand hot water, no tank to refill
- 60,000 BTU propane burner
- Door panels in three cutout sizes
- High altitude suitability mode
Cons
- Door panels sold separately
- Needs 12V DC power
Best Repair for No-Light Faults5 of 6
AutoAlly 93844 91638 93868 RV Water Heater Kit for Atwood 6/10 Gallon on Amazon (opens in a new tab)
AutoAlly 93844 91638 93868 RV Water Heater Kit for Atwood 6/10 Gallon makes the shortlist because three common failure parts in one kit.
Best for
- Atwood no-light repair
Why it made the shortlist
The AutoAlly kit bundles an Atwood 93844 gas valve, a 93868 igniter and a 91638 burner tube for Atwood 6 and 10 gallon heaters. The listing says the igniter is pre-set to a 1/8 inch gap and the parts drop into the original positions in under an hour.
Best for an Atwood that will not light or lights intermittently. Check your model number against the listed parts.
Key dimensions & specs
- Gas valve, igniter, burner tube
- Fits Atwood 6 and 10 gallon
- Igniter pre-set at 1/8 inch
Pros
- Three common failure parts in one kit
- Igniter comes pre-gapped
- Drops into original positions
- Corrosion-resistant valve and ceramic probe
Cons
- Only fits listed Atwood models
- Does not fix a leaking tank
Best Cheap Leak Fix6 of 6
Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape on Amazon (opens in a new tab)
The strongest case for Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape is fits 1/2 inch NPT drain threads.
Best for
- Leaking drain plug
Why it made the shortlist
The Dreyoo is a 1/2 inch NPT male brass drain valve with a hardened steel handle and PTFE tape, sold as a replacement for a leaking RV water heater drain plug. It fits RV, camper and trailer heaters with that thread.
Against the AutoAlly Gas Kit, it fixes a drip at the drain rather than a heating fault. It is by far the cheapest pick here.
Best when water drips from the drain plug.
Key dimensions & specs
- 1/2 inch NPT brass drain valve
- Hardened steel handle
- PTFE tape included
Pros
- Fits 1/2 inch NPT drain threads
- Brass body with steel handle
- PTFE tape included
Cons
- Only a drain fitting, not a heater
- Does not fix tank leaks
How We Built This Shortlist
Each pick was assessed across 5 criteria weighted for real-world use.
- Failure type
- We matched each pick to a dead tank, a no-light fault or a drain leak.
- Cutout fit
- We compared stated dimensions and gallon sizes.
- Fuel and power
- We noted propane, electric and 12V requirements.
- Parts versus unit
- We labeled the kit and valve as repair parts.
- Install effort
- We noted stated install time and clearance.
What Matters Before You Choose an RV Water Heater Replacement
Key buying criteria so you get the right fit the first time.
What failed
A rusted tank needs a new heater, a no-light fault may be a valve or igniter, and a drip may be the drain plug. Replacing the whole unit for a cheap part wastes money. Diagnose first.
Cutout size and clearance
Heaters come for 4 to 6, 10 and tankless openings, and a wrong size means cutting. Product dimensions and extra clearance matter. Measure the opening and compare the dimensions listed.
Fuel and power needs
Direct spark ignition units need 12V, hybrids add electric, and tankless units need 12V for the fan. Your battery and hookups must support them. Read the fuel and voltage.
Tank versus tankless
A tank stores 6 to 10 gallons and recovers slowly, while tankless heats on demand. This changes hot water use and install work. Match to household size.
Parts compatibility
A kit fits only the models it names, and part numbers must match. A wrong part wastes a weekend. Check the model on the heater's label.
Anode and maintenance
A replaceable anode rod extends tank life, and flushing prevents buildup. Skipping both shortens a heater's life. Look for it on the listing and plan seasonal service.
Match an RV Water Heater Replacement to Your RV
By Failure Type
| Your situation | Recommended pick | Why |
|---|---|---|
| Rusted 6 gallon tank | KINGRVER 6 Gal | Fits most 4 to 6 gallon cutouts. |
| Like-for-like Suburban | Suburban SW6D | Porcelain-lined tank with anode rod. |
| 10 gallon cutout | KINGRVER 10 Gal | Hybrid propane and electric. |
| Atwood will not light | AutoAlly Gas Kit | Gas valve, igniter and burner tube. |
| Drain plug drips | Dreyoo Drain Valve | 1/2 inch NPT brass valve. |
Scroll sideways to see every column.
By Budget
| Budget | Recommended pick |
|---|---|
| $0 to $50 | Dreyoo Drain Valve or AutoAlly Gas Kit |
| $240 to $430 | ORBEK Tankless or KINGRVER 6 Gal |
| $440 to $510 | Suburban SW6D or KINGRVER 10 Gal |
Whole Heater vs Repair Part
- Whole heater
- KINGRVER 6 Gal, Suburban SW6D, KINGRVER 10 Gal and ORBEK Tankless replace the unit. They suit a rusted or leaking tank.
- Repair part
- AutoAlly Gas Kit and Dreyoo Drain Valve fix a specific fault cheaply. They suit a no-light heater or a dripping drain.
Most owners should confirm the fault first and try AutoAlly Gas Kit or Dreyoo Drain Valve before buying a whole KINGRVER 6 Gal.
By Preference
| Preference | Recommended pick |
|---|---|
| Familiar brand | Suburban SW6D |
| Remote control | KINGRVER 6 Gal |
| More hot water | KINGRVER 10 Gal |
| On-demand heat | ORBEK Tankless |
For Replacing a Failed Heater Before a Trip Specifically
- Look for
- A matching cutout, the same fuel connections and a part you can install quickly, as the KINGRVER 6 Gal listing shows.
- In this comparison
- KINGRVER 6 Gal lists exact dimensions and Suburban SW6D is a like-for-like swap. Confirm both before ordering.
When to Spend More
- Spend more if
- Spend more on KINGRVER 10 Gal or ORBEK Tankless if you want more hot water or an on-demand upgrade.
- Save if
- Save with Dreyoo Drain Valve or AutoAlly Gas Kit if the fault is a drip or a no-light problem.
Before You Bring One Home
Do I need a whole new heater if mine will not light?
Not always. AutoAlly Gas Kit replaces the gas valve, igniter and burner tube on listed Atwood models. Check your model first.
How do I know which size heater fits?
Measure the opening and compare the listing dimensions, such as 21 by 12.7 by 12.7 inches for KINGRVER 6 Gal. Allow the clearance listed.
Is KINGRVER 6 Gal worth more than Suburban SW6D?
If you want a remote controller, yes. If you prefer the established brand and a replaceable anode rod, the Suburban SW6D fits.
How do I replace a drain plug?
Turn off power and gas, drain the tank, unscrew the old plug, wrap the Dreyoo Drain Valve threads with PTFE tape and tighten. Check for leaks.
Should I hire a pro for gas work?
If you are not comfortable with propane connections, yes. Leak-test every gas joint.
Bottom Line
Best overall: KINGRVER 6 Gallon RV Tank Water Heater — best overall tank replacement pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all rv water heater replacement on Amazon — Prime-eligible options with current pricing.