Suburban RV Furnace Units

How do I know which Suburban RV furnace fits my coach?

Match the model number printed on the furnace data plate (typically SF-20, SF-25, SF-30, SF-35, SF-42, NT-series, or P-series) before ordering. The replacement unit must match BTU output, vent dimensions, and duct configuration (ducted vs. non-ducted). Suburban furnaces use a standardized footprint within each BTU class, so an SF-30 typically replaces another SF-30 without cabinet modification. Confirm the model number twice before purchase. If you need help verifying fitment, text or call 817-984-1852.

What BTU size Suburban furnace do I need for my RV?

Size the furnace to the heated square footage and climate. A 16,000 BTU SF-20 covers smaller travel trailers and pop-ups. The SF-30 (30,000 BTU) is the most common fit for mid-size travel trailers and fifth wheels. SF-35 and SF-42 units are sized for larger fifth wheels, motorhomes, and full-time use in cold climates. If you boondock or winter camp, size up one BTU class to reduce run time and propane consumption. Pair the furnace replacement with a RV winterizing kit if you store the rig in freezing temperatures.

Which replacement parts fail most often on Suburban furnaces?

The most common failure points are the sail switch, limit switch, circuit board (typically the 521099 or 520947 board), gas valve, and blower motor. Thermal fuses and igniter electrodes are also frequent service items. Before replacing the entire furnace, diagnose the specific failed component, most issues trace back to one part rather than the full unit. For related electrical troubleshooting, check the Southwire Surge Guard RV surge protectors if you suspect voltage issues are damaging control boards.

Do Suburban RV furnaces ship freight, and what is the lead time?

Complete Suburban furnace units ship via standard ground or truck freight depending on size and destination. Most SF-series furnaces ship ground; larger units and palletized orders ship freight. Replacement parts (boards, valves, switches, motors) ship ground and typically arrive within 3-7 business days. Free shipping applies to qualifying orders over $100. If you also need a 10 gallon RV water heater or related LP appliance, combining the order can reduce freight costs.

Can I install a Suburban furnace myself?

Yes, if you are comfortable working with LP gas connections, 12V DC wiring, and sheet metal ductwork. The furnace slides into the existing cabinet opening, connects to the LP gas line with a flare fitting, wires to the thermostat and 12V power, and ties into the existing return air and supply ducts. Always leak-test the gas connection with soapy water before firing the unit, and verify the thermostat wiring matches the new control board terminal layout. If the gas line, vent, or duct work needs modification, a certified RV technician should handle the install.