Buying guide · 10 min read · Updated October 2, 2026

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 Bowen HigginsRV Editor at RV Gear Lab6 products comparedSpec-sheet researched

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.

RV Gear Lab field notes

The Rig Fit Check

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

Before you buy

What Matters Before You Choose an RV Water Heater Replacement

Key buying criteria so you get the right fit the first time.

01
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.
02
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.
03
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.
04
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.
05
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.
06
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.

Our standards

Why You Can Trust RV Gear Lab

At RV Gear Lab, we compare products based on rig fit and power or hookup compatibility, verified specifications, usability, setup requirements, weight, durability, and real-world trade-offs. We do not rank products purely on marketing claims or commission rates.

We have not personally tested every product listed. Where hands-on testing is not available, recommendations are based on verified manufacturer specifications, product documentation, use-case fit, and comparative research.

How we review RV gear →

Detailed reviews

The 6 best rv water heater replacement, explained

Best Overall Tank Replacement · 1 of 6

KINGRVER 6 Gallon RV Tank Water Heater

6 gal propane, DSI
21 x 12.7 x 12.7 inches
3-level remote controller

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Best for: Standard 6 gallon cutouts

Our take

Best for swapping a failed 6 gallon tank in a standard opening.

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.

What works

Sized for most 4 to 6 gallon cutouts
Remote controller with three temperature levels
12V DC ignition from the RV system
Direct spark ignition

Watch out for

Needs about 3 inches extra clearance
Brand has less track record

The catch: Against KINGRVER 10 Gal, it fits the smaller cutout and costs less.

Check price on Amazon

Best Established Tank · 2 of 6

Suburban SW6D 6-Gallon RV Water Heater

6 gal DSI, porcelain-lined
Replaceable anode rod
Optional electric element

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Best for: Like-for-like Suburban swap

Our take

Best for a like-for-like swap with an existing Suburban.

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.

What works

Replaceable anode rod protects the tank
Porcelain-lined steel tank
Optional electric element for hookups
Direct spark ignition

Watch out for

Electric element is optional
No remote control

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Best Larger Tank Hybrid · 3 of 6

KINGRVER 10 Gallon RV Tank Water Heater

10 gal propane and electric
12,000 BTU burner
Indoor temperature control

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Best for: 10 gallon openings

Our take

Best for a 10 gallon opening and heavy hot water use.

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.

What works

Propane, electric or both modes
12,000 BTU propane burner
Adjusts from inside the RV
Standard water and gas connections

Watch out for

Only fits 10 gallon cutouts

The catch: Against the 6 gallon units, it holds more water and recovers faster in hybrid mode but costs more and needs a 10 gallon cutout.

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Best Tankless Upgrade · 4 of 6

ORBEK RV Tankless Water Heater

60,000 BTU propane, 12V DC
Oxygen-free copper exchangers
High altitude mode

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Best for: Tank to tankless swap

Our take

Best for owners who want to replace a tank with an on-demand unit.

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.

What works

On-demand hot water, no tank to refill
60,000 BTU propane burner
Door panels in three cutout sizes
High altitude suitability mode

Watch out for

Door panels sold separately
Needs 12V DC power

Check price on Amazon

Best Repair for No-Light Faults · 5 of 6

AutoAlly 93844 91638 93868 RV Water Heater Kit for Atwood 6/10 Gallon

Gas valve, igniter, burner tube
Fits Atwood 6 and 10 gallon
Igniter pre-set at 1/8 inch

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Best for: Atwood no-light repair

Our take

Best for an Atwood that will not light or lights intermittently.

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.

Check your model number against the listed parts.

What works

Three common failure parts in one kit
Igniter comes pre-gapped
Drops into original positions
Corrosion-resistant valve and ceramic probe

Watch out for

Only fits listed Atwood models
Does not fix a leaking tank

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Best Cheap Leak Fix · 6 of 6

Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape

1/2 inch NPT brass drain valve
Hardened steel handle
PTFE tape included

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Best for: Leaking drain plug

Our take

Best when water drips from the 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.

What works

Fits 1/2 inch NPT drain threads
Brass body with steel handle
PTFE tape included

Watch out for

Only a drain fitting, not a heater
Does not fix tank leaks

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Methodology

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.

Decision guide

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.

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.

FAQ

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

The short version

Best Overall Tank Replacement
KINGRVER 6 Gallon RV Tank Water Heater
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
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
Check price for KINGRVER 10 Gallon RV Tank Water Heater (opens in a new tab)
Best Tankless Upgrade
ORBEK RV Tankless Water Heater
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
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
Check price for Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape (opens in a new tab)

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About the author

Bowen Higgins

RV Editor at RV Gear Lab

Bowen covers RV power, water systems, towing and leveling, upkeep and interior comfort, with a focus on matching gear to the rig, the hookups and the way you actually travel.

6 Best RV Water Heater Replacement in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose an RV Water Heater Replacement

What failed

Cutout size and clearance

Fuel and power needs

Tank versus tankless

Parts compatibility

Anode and maintenance

Why You Can Trust RV Gear Lab

The 6 best rv water heater replacement, explained

KINGRVER 6 Gallon RV Tank Water Heater

Suburban SW6D 6-Gallon RV Water Heater

KINGRVER 10 Gallon RV Tank Water Heater

ORBEK RV Tankless Water Heater

AutoAlly 93844 91638 93868 RV Water Heater Kit for Atwood 6/10 Gallon

Dreyoo 1 Pack 1/2"RV Water Heater Replacement Drain Valve with Tape

How We Built This Shortlist

Failure type

Cutout fit

Fuel and power

Parts versus unit

Install effort

Match an RV Water Heater Replacement to Your RV

By Failure Type

By Budget

Whole Heater vs Repair Part

By Preference

For Replacing a Failed Heater Before a Trip Specifically

When to Spend More

Before You Bring One Home

Do I need a whole new heater if mine will not light?

How do I know which size heater fits?

Is KINGRVER 6 Gal worth more than Suburban SW6D?

How do I replace a drain plug?

Should I hire a pro for gas work?

The short version

Bowen Higgins

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