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

5 Best Tankless Replacement For 10 Gallon RV Water Heater in 2026: A Practical RV Guide

Five picks for replacing a 10 gallon RV water heater with a tankless unit, including two true tankless heaters and two small filter kits for Rinnai units.

By Bowen HigginsRV Editor at RV Gear Lab5 products comparedSpec-sheet researched

Replacing a 10 gallon tank with a tankless heater is a cutout and plumbing job as much as a product choice. The opening, the door size and the 12 volt supply all have to match before the new heater lights.

Three picks are RV-oriented tankless heaters and two are tiny filter screens that fit Rinnai units, not RV heaters. The guide says so plainly, and a flow rate means little without its temperature rise.

RV Gear Lab field notes

The Rig Fit Check

Start with the job: FOGATTI InstaShower 8 Plus RV Tankless Water Heater leads this shortlist for Complete swap kits. 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 55,000 BTU propane tankless, 60,000 BTU propane tankless, 60,000 BTU, 12V DC. Confirm the exact model and included components before ordering.
Trade-off to plan for: Flow has no stated temperature rise

Before you buy

What Matters Before You Choose a Tankless Replacement For 10 Gallon RV Water Heater

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

01
Opening and door
A 10 gallon tank often leaves a larger opening than a tankless needs. FOGATTI and RVPart Pro list 13 by 13 inch openings. Measure your cutout and door.
02
12 volt supply
Tankless units need 12 volts for the fan and controls. Check that your supply and wiring can carry it. Read the draw.
03
Scald protection
A child lock or kill switch limits outlet temperature. Suburban lists 113 degrees F. Check the safety list.
04
Flow and temperature rise
A GPM figure is meaningful only with inlet and outlet temperatures. Winter water lowers flow. Look for a stated rise.
05
Kit contents
FOGATTI includes a door, remote and valve, and others sell doors separately. Add costs for missing parts. Check what ships.
06
Gas and venting
Propane heaters need gas lines and venting per the manual. Follow it and local codes. Check named certifications.

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 5 best tankless replacement for 10 gallon rv water heater, explained

Best Overall · 1 of 5

FOGATTI InstaShower 8 Plus RV Tankless Water Heater

55,000 BTU propane tankless
Door, remote, relief valve
High-altitude mode to 9,800 ft

Check price on Amazon

Best for: Complete swap kits

Our take

It is the best match for owners swapping a 10 gallon tank who want the door and remote included.

Why it made the shortlist

FOGATTI InstaShower 8 Plus is a 55,000 BTU propane tankless heater with a stated 2.9 GPM maximum. The listing says it fits a 13 by 13 inch opening and includes a built-in pressure relief valve, a 15 inch door and a 2 meter remote, with a high-altitude mode to 9,800 feet.

Against Suburban ST-60, it includes the door and remote. Against RVPart Pro, it states altitude and a complete kit.

Buyers focused on complete swap kits will find it a sensible match.

What works

Includes door and remote
Built-in pressure relief valve
High-altitude mode to 9,800 feet
Fits 13 x 13 inch opening

Watch out for

Flow has no stated temperature rise
Needs 12V power to run

Check price on Amazon

Best Safety Features · 2 of 5

Suburban ST-60 60

60,000 BTU propane tankless
Child lock to 113°F
Flame-out protection

Check price on Amazon

Best for: Families with children

Our take

It suits families with children who want stated scald protection.

Why it made the shortlist

Suburban ST-60 is a 60,000 BTU propane tankless heater with flame-out protection, a high-temperature kill switch and a child lock that limits outlet temperature to 113 degrees F.

Against FOGATTI InstaShower 8 Plus, it lists a child lock and scald protection. Against RVPart Pro, it is a Suburban brand unit.

It earns its slot for families with children.

What works

Child lock limits outlet to 113°F
Flame-out protection
Scald protection kill switch
Freeze protection stated

Watch out for

Door sold separately
Needs 12V power to run

Check price on Amazon

Best Value Tankless · 3 of 5

RVPart Pro Tankless Water Heater for RVs

60,000 BTU, 12V DC
Up to 3.5 GPM stated
150 PSI pressure reducer

Check price on Amazon

Best for: Value drop-in swaps

Our take

It suits owners who want a lower-cost drop-in.

Why it made the shortlist

RVPart Pro is a 60,000 BTU propane tankless heater with 12 volt DC power and a stated flow of up to 3.5 GPM. The listing says it is a drop-in for Suburban and Atwood heaters, has a 150 PSI pressure reducing valve and fits 15 by 15, 15 by 18 and 18 by 18 inch doors with a 13 by 13 inch opening.

Against Suburban ST-60, it lists a high-altitude mode and a pressure reducer. Against FOGATTI InstaShower 8 Plus, it has more burner at a lower price.

It is a natural fit for value drop-in swaps.

What works

Drop-in for Suburban and Atwood
Built-in 150 PSI pressure reducer
Fits three door sizes

Watch out for

Flow has no stated temperature rise
Needs 12V power to run

Check price on Amazon

Rinnai Filter, Not an RV Heater · 4 of 5

H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater

Rinnai inlet filter screen
0.94 x 1.8 x 0.78 inch
Replace every 2 to 3 months

Check price on Amazon

Best for: Rinnai owners

Our take

Think of it as the pick for rinnai owners.

Why it made the shortlist

VYH H98-510-S is a tankless water heater inlet filter screen for Rinnai units, measuring 0.94 by 1.8 by 0.78 inches. The listing says to replace it about every 2 to 3 months.

Against the RV heaters, it is a small repair part. Against VYH Filter B, it is the lower-cost listing.

What works

Restores flow on a clogged Rinnai unit
Easy to install
Small and light

Watch out for

Not for RV propane tankless heaters
Check your Rinnai model first

Check price on Amazon

Rinnai Filter Kit · 5 of 5

H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water Heater

Rinnai inlet filter kit
H98-510-S part
Replace every 2 to 3 months

Check price on Amazon

Best for: Rinnai owners

Our take

It suits Rinnai owners who want the part.

Why it made the shortlist

VYH H98-510-S kit is a tankless inlet filter screen set for Rinnai units. The listing says to replace the screens about every 2 to 3 months to restore performance.

Against VYH Filter A, it is the higher-priced listing of the same part. Against the RV heaters, it is a repair part.

Buyers focused on rinnai owners will find it a sensible match.

What works

Restores flow on a clogged Rinnai unit
Easy to install
Small and light

Watch out for

Not for RV propane tankless heaters
Check your Rinnai model first

Check price on Amazon

Methodology

How We Built This Shortlist

Each pick was assessed across 5 criteria weighted for real-world use.

Fit

We compared opening, door and drop-in claims.

Burner output

BTU and stated flow figures were compared.

Safety features

Flame-out, scald and child lock features were compared.

Kit contents

Doors, remotes and valves were compared.

Relevance

Parts that do not fit RV heaters were flagged.

Decision guide

Match a Tankless Replacement For 10 Gallon RV Water Heater to Your RV

By Need

Your situation	Recommended pick	Why
Complete kit	FOGATTI InstaShower 8 Plus	Door, remote, valve.
Child safety	Suburban ST-60	Child lock to 113°F.
Lower-cost drop-in	RVPart Pro 60K	Drop-in for Suburban and Atwood.
Rinnai filter	VYH Filter A	Rinnai part.
Rinnai kit	VYH Filter B	Rinnai kit.

By Budget

Budget	Recommended pick
$0 to $10	VYH Filter A or VYH Filter B
$290 to $450	RVPart Pro 60K or Suburban ST-60
$510 to $520	FOGATTI InstaShower 8 Plus

Complete Kit vs Heater Only

Complete kit

FOGATTI InstaShower 8 Plus includes door, remote and valve.

Heater only

Suburban ST-60 and RVPart Pro 60K need doors or other parts added.

Most owners should choose FOGATTI InstaShower 8 Plus for a swap with fewer extras.

By Budget

Budget	Recommended pick
Lowest cost heater	RVPart Pro 60K
Mid cost	Suburban ST-60
Higher	FOGATTI InstaShower 8 Plus
Filter part	VYH Filter A

For Families With Children Specifically

Look for

A stated outlet limit and child lock, as on Suburban ST-60.

In this comparison

Suburban ST-60 lists a child lock that caps the outlet at 113 degrees F. Test water temperature before showering anyway.

When to Spend More

Spend more if

Spend more on FOGATTI InstaShower 8 Plus or Suburban ST-60 for kit contents or safety features.

Save if

Save with RVPart Pro 60K for a lower-cost swap.

FAQ

Before You Bring One Home

Will a tankless heater fit my 10 gallon cutout?

Check the opening and door size. FOGATTI InstaShower 8 Plus lists 13 by 13 inches.

What is the common mistake?

Ordering without checking the 12 volt supply. Tankless units need it.

Are the VYH filters for RV heaters?

No. They are Rinnai parts. Choose an RV heater instead.

How do I swap the heater?

Shut off gas and water, remove the old tank, fit the new unit per the manual and leak-test the gas. Have a pro check gas work if unsure.

Do I need a pressure reducer?

Some units include one, like RVPart Pro 60K. Check what is built in.

Bottom line

The short version

Browse more tankless replacement for 10 gallon rv water heater on Amazon →

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.

5 Best Tankless Replacement For 10 Gallon RV Water Heater in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose a Tankless Replacement For 10 Gallon RV Water Heater

Opening and door

12 volt supply

Scald protection

Flow and temperature rise

Kit contents

Gas and venting

Why You Can Trust RV Gear Lab

The 5 best tankless replacement for 10 gallon rv water heater, explained

FOGATTI InstaShower 8 Plus RV Tankless Water Heater

Suburban ST-60 60

RVPart Pro Tankless Water Heater for RVs

H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater

H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water Heater

How We Built This Shortlist

Fit

Burner output

Safety features

Kit contents

Relevance

Match a Tankless Replacement For 10 Gallon RV Water Heater to Your RV

By Need

By Budget

Complete Kit vs Heater Only

By Budget

For Families With Children Specifically

When to Spend More

Before You Bring One Home

Will a tankless heater fit my 10 gallon cutout?

What is the common mistake?

Are the VYH filters for RV heaters?

How do I swap the heater?

Do I need a pressure reducer?

The short version

Bowen Higgins

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