Buying Guide
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 Hardcastle's RV Editors
10 min read5 products evaluated
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.
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
- 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
The Practical Shortlist
A road-tested-thinking look at 5 options, organized around the job each one suits best.
Best Overall
FOGATTI InstaShower 8 Plus RV Tankless Water Heater
Complete swap kits
Our take Check price for FOGATTI InstaShower 8 Plus RV Tankless Water Heater (opens in a new tab)
Best Safety Features
Suburban ST-60 60
Families with children
Our take Check price for Suburban ST-60 60 (opens in a new tab)
Best Value Tankless
RVPart Pro Tankless Water Heater for RVs
Value drop-in swaps
Our take Check price for RVPart Pro Tankless Water Heater for RVs (opens in a new tab)
Rinnai Filter, Not an RV Heater
H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater
Rinnai owners
Our take Check price for H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater (opens in a new tab)
Rinnai Filter Kit
H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water Heater
Rinnai owners
Our take Check price for H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water Heater (opens in a new tab)
Why Each Pick Made the Cut
Best Overall1 of 5
FOGATTI InstaShower 8 Plus RV Tankless Water Heater on Amazon (opens in a new tab)
FOGATTI InstaShower 8 Plus RV Tankless Water Heater is the better fit when complete swap kits.
Best for
- Complete swap kits
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.
It is the best match for owners swapping a 10 gallon tank who want the door and remote included. Buyers focused on complete swap kits will find it a sensible match.
Key dimensions & specs
- 55,000 BTU propane tankless
- Door, remote, relief valve
- High-altitude mode to 9,800 ft
Pros
- Includes door and remote
- Built-in pressure relief valve
- High-altitude mode to 9,800 feet
- Fits 13 x 13 inch opening
Cons
- Flow has no stated temperature rise
- Needs 12V power to run
Best Safety Features2 of 5
Suburban ST-60 60 on Amazon (opens in a new tab)
Choose Suburban ST-60 60 for child lock limits outlet to 113°F.
Best for
- Families with children
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 suits families with children who want stated scald protection. It earns its slot for families with children.
Key dimensions & specs
- 60,000 BTU propane tankless
- Child lock to 113°F
- Flame-out protection
Pros
- Child lock limits outlet to 113°F
- Flame-out protection
- Scald protection kill switch
- Freeze protection stated
Cons
- Door sold separately
- Needs 12V power to run
Best Value Tankless3 of 5
RVPart Pro Tankless Water Heater for RVs on Amazon (opens in a new tab)
RVPart Pro Tankless Water Heater for RVs makes the shortlist because drop-in for Suburban and Atwood.
Best for
- Value drop-in swaps
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 suits owners who want a lower-cost drop-in. It is a natural fit for value drop-in swaps.
Key dimensions & specs
- 60,000 BTU, 12V DC
- Up to 3.5 GPM stated
- 150 PSI pressure reducer
Pros
- Drop-in for Suburban and Atwood
- Built-in 150 PSI pressure reducer
- Fits three door sizes
Cons
- Flow has no stated temperature rise
- Needs 12V power to run
Rinnai Filter, Not an RV Heater4 of 5
H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater on Amazon (opens in a new tab)
The strongest case for H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater is restores flow on a clogged Rinnai unit.
Best 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.
Think of it as the pick for rinnai owners.
Key dimensions & specs
- Rinnai inlet filter screen
- 0.94 x 1.8 x 0.78 inch
- Replace every 2 to 3 months
Pros
- Restores flow on a clogged Rinnai unit
- Easy to install
- Small and light
Cons
- Not for RV propane tankless heaters
- Check your Rinnai model first
Rinnai Filter Kit5 of 5
H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water Heater on Amazon (opens in a new tab)
H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water Heater is the better fit when rinnai owners.
Best for
- Rinnai owners
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.
It suits Rinnai owners who want the part. Buyers focused on rinnai owners will find it a sensible match.
Key dimensions & specs
- Rinnai inlet filter kit
- H98-510-S part
- Replace every 2 to 3 months
Pros
- Restores flow on a clogged Rinnai unit
- Easy to install
- Small and light
Cons
- Not for RV propane tankless heaters
- Check your Rinnai model first
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.
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.
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.
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.
Scald protection
A child lock or kill switch limits outlet temperature. Suburban lists 113 degrees F. Check the safety list.
Flow and temperature rise
A GPM figure is meaningful only with inlet and outlet temperatures. Winter water lowers flow. Look for a stated rise.
Kit contents
FOGATTI includes a door, remote and valve, and others sell doors separately. Add costs for missing parts. Check what ships.
Gas and venting
Propane heaters need gas lines and venting per the manual. Follow it and local codes. Check named certifications.
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. |
Scroll sideways to see every column.
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.
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
Best overall: FOGATTI InstaShower 8 Plus RV Tankless Water Heater — best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all tankless replacement for 10 gallon rv water heater on Amazon — Prime-eligible options with current pricing.