upgrading suburban sw12de water heater in 2012 Keystone Montana with Fogatti tankless water heater
Published 09/18/2025
Products Featured in This Question
Question:
I’ve got a 2012 Keystone Montana fifth wheel with a Suburban SW12DE. Will the Fogatti FG38FR cover that larger cutout?
asked by: Dave
Expert Reply:
Dave, you’re in luck - the Fogatti # FG38FR with its 18" × 18" black door is designed for larger Suburban replacements like your SW12DE. The cutout behind the door may need slight shimming, but the service door covers perfectly. If you’d prefer white, that’s the # FG58FR. Many RV owners make this swap for the endless hot water, so you don't have to wait for the tanked units to heat up. Most people go with these now days since they are a better technology and much more efficient as well.
Have you already measured your cutout depth to be sure you’ve got the clearance for the new unit?
Product Page this Question was Asked From
Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 18"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 18D Inch
- Black Door
- Fogatti
more information >
Featured Help Information
Instructions
Continue Researching
- Q&A: Warranty on Fogatti InstaCool Ultra RV AC
- Q&A: How Can I Tell What Pin Box Model Is On My 2019 Forest River Fifth Wheel
- Q&A: Will The Fogatti InstaShower 8 Pro Work As A Replacement For An Atwood OD-5001?
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Is the Fogatti InstaShower 7 RV Tankless Water Heater a Good Replacement for My G6A-7?
- Q&A: Does The Fogatti InstaShower 8 Plus Tankless Water Heater Include The Access Door?
- Q&A: What Is The Difference Between The Three Fogatti InstaShower Tankless Water Heaters?
- Q&A: Troubleshooting A Fogatti Tankless Water Heater That Won't Power On
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Converting Your RV Water Heater to Tankless
- Article: RV Propane 101: How Does My RV's Propane System Work?