Replacement for Dometic 38915 and 38919 RV Furnaces  

Question:

Expert Reply:

Hey Kevin! I recommend the Dometic 12,000 BTU RV Furnace # DMC933HV to replace your older DFSAD12111, part number 38915. This is the updated version with the exterior access door, so it's the correct replacement for your existing furnace.

We carry both configurations depending on which furnace you're replacing:

-Dometic 12,000 BTU RV Furnace with Door # DMC933HV - Replaces DFSAD12111 (38915)

-Dometic 12,000 BTU RV Furnace without Door # DMC333HV - Replaces DFSAD12121 (38919)

The newer furnaces maintain the same installation footprint and thermostat compatibility as the older models. Dometic also updated the design with a Hall-effect sensor in place of the traditional sail switch and added soft-start technology. You can keep your existing compatible thermostat, so you won't need to replace the entire heating setup.

What kind of travel trailer are you working on?

expert reply by: Robin H

0

Kevin

11/4/2026

Thanks! It's in our Jayco Jay Flight. I've had trouble with the sail switch on the old furnace before. Does the new version eliminate that switch completely?

Robin H.

11/4/2026

@Kevin yes, the newer Dometic # DMC933HV uses a Hall-effect sensor instead of the traditional sail switch to monitor blower operation. That eliminates the old mechanical sail switch, which is one less component you'll have to worry about sticking or failing.