Dometic 18000 BTU LP Gas RV Furnace Single Stage

When cold mornings roll into camp, the Dometic 18,000 BTU LP gas furnace is what gets your rig warm and keeps it that way. It's a compact, single-stage forced-air furnace built for campers, camper vans, small travel trailers, and any build where space is tight but real heating output still matters. If you've ever woken up shivering because an undersized heater couldn't keep pace, this is the fix.

The furnace delivers 18,000 BTU of heating input, and it's engineered to convert that into steady, usable warmth of roughly 13,680 BTU output at the registers. That's enough to take the bite out of a frosty desert night or a shoulder-season trip in the mountains. As a single-stage unit, it keeps things simple and reliable. It fires at full output when the thermostat calls for heat, then shuts off cleanly when your cabin is warm, cycling to hold the temperature you set.

Fuel is standard LP gas, so it runs off your rig's propane supply just like your stove and water heater. The blower and controls operate on 12-volt DC power, which means the furnace keeps working off your house batteries when you're boondocking far from shore power. That combination of propane heat and 12-volt operation is exactly why forced-air furnaces like this one are the backbone of RV heating.

Dometic designed this furnace to be ductable, so you can route warm air where you need it through most common duct configurations. Whether you're heating a single open space or pushing warmth to a back bedroom and a bathroom, the flexible duct options let you tailor the install to your floor plan. It's a genuinely versatile platform for both new builds and replacements.

Size is a big part of the appeal. The cabinet measures about 12 inches wide, 7 inches tall, and 20 inches deep, and the unit weighs only around 21 pounds. That small footprint makes it a natural choice for vans and compact trailers where every inch of cabinet space counts. It slips into tight mechanical bays that larger furnaces simply won't fit.

The blower motor draws about 4.8 amps on 12-volt power while running, which is modest enough to live comfortably within a well-planned house battery system. A sail switch is part of the design, a safety feature that confirms the blower is actually moving air before the burner will light, so the furnace won't fire without proper airflow. It's the kind of built-in protection you want in a gas appliance you sleep next to.

Installation follows familiar RV furnace practice, with an outside access panel for the burner and combustion air and a duct connection on the inside. Because it's a gas appliance, most owners have it installed or inspected by a qualified RV technician and always follow the Dometic installation instructions to the letter. Done right, it's a set-and-forget source of heat for years of trips.

Think about where a compact furnace like this really pays off. A camper van build where the mechanical bay is measured in inches. A small travel trailer that spends fall weekends at high elevation. An overland rig that needs reliable heat off-grid without a big electrical draw. In each case you want strong output from a package that fits and sips power, and that's the balance this Dometic furnace is built to strike.

Dometic has built RV comfort and climate gear for decades, and this furnace carries that reliability forward. Parts and service are widely available, the platform is proven in the field, and the single-stage design keeps maintenance straightforward. For anyone building out a van or replacing a tired heater in a compact rig, it's a smart, dependable choice.

If you want warm, quiet, propane-fired heat that fits a small space and runs off your batteries, the Dometic 18,000 BTU LP gas furnace belongs on your short list. Get it installed before the temperature drops and you'll be glad you did on the very first cold night.