RV Furnaces
A cracked heat exchanger, sheet metal corroded through, or a furnace that simply can't make the BTUs you now need: any of these is the point to stop repairing and swap in a new unit. On most rigs a replacement forced-air furnace is a bolt-in job. This category covers Suburban SF-series and Dometic Hydro Flame furnaces from 25,000 to 42,000 BTU, in low-profile and vertical/horizontal-mount styles, all 12-volt and propane-fired.
8 products
Dometic DFLA40211 Large RV Furnace | 40,000 BTU, LP or Natural Gas
Dometic DFMD30111 Low-Profile LP Gas Furnace | 30,000 BTU, 12V
Dometic Hydro Flame Furnace | 25,000 BTU, 12V, Ducted Forced-Air
Suburban SF-42VHQ RV Furnace | 42,000 BTU/h, Vertical/Horizontal Mount
Suburban SF-35VHFQ RV Furnace | 35,000 BTU/h, Vertical/Horizontal Mount
Suburban SF-35VHQ Ducted RV Furnace | 35,000 BTU, LP Gas, Low-Profile
Suburban SF-30FQ 12V RV Furnace | 30,000 BTU/h, Low-Profile
Suburban SF-25Q RV Furnace | 25,000 BTU/h, 12V Ducted Furnace
Sizing and choosing an RV furnace
These are all the same basic animal: a 12-volt blower, a propane burner, and ducting out to the registers. What actually varies between them is how many BTUs you need, whether the new unit fits the old opening, and which mounting orientation your rig uses.
- BTU rating. The units here span 25,000 (Dometic Hydro Flame, Suburban SF-25Q) up to 42,000 BTU (Suburban SF-42VHQ). Rough rule: small trailers and vans do fine at 25,000 to 30,000, while big fifth wheels and cold-weather rigs want 35,000 to 42,000. Bigger isn't automatically better, since an oversized furnace short-cycles and burns more propane.
- Fit and profile. Low-profile models like the Dometic DFMD30111 and Suburban SF-30FQ suit shallow compartments. When you're replacing an existing furnace, match the footprint and duct-collar layout so you're not cutting a new opening.
- Mounting orientation. The Suburban VH models (SF-35VHQ, SF-35VHFQ, SF-42VHQ) mount vertically or horizontally, which buys you flexibility in a tight basement. Confirm your available orientation before ordering.
- Fuel type. Nearly all run LP gas, but a few Dometic units like the DFLA40211 accept LP or natural gas, worth noting only for a park model or a rig plumbed for natural gas.
Match the replacement to your existing duct and vent layout, and plan on fresh gaskets and possibly a new vent cap during the swap. Those small pieces are in Furnace Parts, the bottles and regulators to feed it live under Propane & LP Gas, and if you want a backup to stretch your propane, see Portable & Space Heaters.