Dometic DFMDH25111 25,000 BTU LP Gas Furnace

When the temperature drops and you're parked somewhere quiet, you want heat that just works. The Dometic DFMDH25111 is a 25,000 BTU LP gas furnace designed to do exactly that. It's a single-stage, fan-forced unit that burns propane and pushes warm air through your rig's ductwork, making it a dependable choice for RVs, travel trailers, fifth wheels, and compact cabins that need real heating output without a lot of fuss.

The 25,000 BTU input rating puts this furnace in the sweet spot for mid-size coaches and trailers. It's enough muscle to warm a living space quickly on a frosty morning, yet it isn't so oversized that it short-cycles in a smaller floor plan. Single-stage operation keeps the design simple and reliable. The burner fires at one consistent output, the blower moves the heated air, and your thermostat handles the rest. Fewer moving parts and fewer failure points mean more nights of steady warmth.

Air delivery is bottom discharge, which suits floor-mounted installations where the warm air needs to travel down and out into ducted runs. The fan-forced blower does the heavy lifting, distributing heat evenly instead of letting it pool near the unit. That even spread is what keeps the far end of a coach comfortable rather than roasting the space right in front of the register. This model, the DFMDH25111, includes the exterior access door variant, giving you a clean finished look at the sidewall vent.

Dometic engineered this furnace around a sealed combustion chamber, so the air it burns comes from outside the living space and the exhaust goes back outside. That separation is important. It means the heat you feel indoors is clean, forced air, while combustion byproducts stay isolated from where you sleep and breathe. Direct spark ignition lights the burner automatically each time the thermostat calls for heat, so there's no standing pilot to relight and no wasted fuel between cycles.

Safety is layered into the design. A sail switch confirms the blower is actually moving air before the burner fires, and a high-limit switch shuts the burner down if temperatures ever climb past the safe range. Together they make sure the furnace only runs when everything is working the way it should. The unit operates on 12V DC power, drawing roughly 7.5 amps while running, which keeps it friendly to your house battery and compatible with standard 12-volt RV thermostats you may already have installed.

Physically, the DFMDH25111 is built to drop into common furnace bays. It measures about 16.5 inches wide, 7 inches tall, and 20 inches deep, and weighs around 34 pounds, so a single installer can maneuver it into place. If you're replacing an aging unit, that compact footprint and ducted, bottom-discharge layout make it a natural fit for a lot of existing installations.

Dometic has been building comfort and climate equipment for the mobile lifestyle for decades, and that experience shows in how this furnace is put together. It's the kind of component you install once and stop thinking about, which is exactly what you want from your heat source when you're miles from the nearest service center. Whether you're chasing shoulder-season camping, living in your rig full-time, or just want reliable warmth on the occasional cold snap, the DFMDH25111 delivers steady, ducted propane heat you can count on.

If you need more output for a larger coach, Dometic offers a 30,000 BTU version in the same family, and there's a doorless 25,000 BTU variant as well. But for a lot of RVers, this 25,000 BTU doored model hits the balance of power, efficiency, and easy installation just right. Pair it with a compatible thermostat, connect it to your existing LP supply and ductwork, and you've got a heat source ready for years of cold nights, early spring trips, and late fall getaways when everyone else has already packed up and gone home.