Can Fogatti InstaShower 8 Plus RV Tankless Water Heater Replace Atwood Water Heater
Updated 11/13/2025 | Published 10/17/2025
Question:
what do I need to do or measure on our old tankless water heater in our 5th wheel to make sure I get the one that will fit the hole that the old heater is in? the door measures 14X18 but that is all that I have measured for now. I believe the old heater is a attwood, or that is the part that is leaking.
asked by: Kurt D
Expert Reply:
Hey Kurt! The Fogatti InstaShower 8 Plus RV Tankless Water Heater # FG26FR requires a cutout that is 13" wide x 13" tall x 13-13/16" deep for installation. You will need to measure the existing cutout to make sure it will fit where your Atwood is installed now. As long as you have this much space, or more, you will be able to use this water heater as a replacement.
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Product Page this Question was Asked From
Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 15"x18" Black Door
- RV Water Heater
- Tankless Water Heater
- Gas
- 40001 - 55000 Btu
- 12 Volts
- 13L x 13W x 13-13/16D Inch Cutout
- 14-5/16L x 18W x 15D Inch
- Black Door
- Fogatti
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Robin H.
11/13/2025
Hey Kurt, were you able to measure the cutout on your 5th wheel’s old Atwood water heater to see if the Fogatti InstaShower 8 Plus would fit? Knowing how that measurement matched up could really help others replacing the same model. Your update could make it easier for the next person with the same issue.