Heating
Gas furnace blower running watts and starting watts
Use these values as a planning range only. The conservative default for gas furnace blower is 700 W running and 1,600 W starting.
| Load type | Low | Default | High |
|---|---|---|---|
| Running watts | 400 W | 700 W | 1,200 W |
| Starting watts | 900 W | 1,600 W | 2,500 W |
Source note
Furnace blower motors vary by ECM/PSC design; default reflects common residential nameplate ranges.
Never operate a fuel-burning generator indoors, in a garage, on a porch, or near open windows. Use a listed transfer switch or interlock installed by a qualified electrician for home wiring, and verify actual device nameplates before buying equipment.
Related calculator pages
- What size generator for a furnace and refrigerator?
- Will a 1000 watt generator run refrigerator, furnace blower, and lights?
- Will a 1000 watt generator run well pump and furnace blower?
- Will a 1500 watt generator run refrigerator, furnace blower, and lights?
- Will a 1500 watt generator run well pump and furnace blower?
- Will a 2000 watt generator run refrigerator, furnace blower, and lights?
- Will a 2000 watt generator run well pump and furnace blower?
- Will a 2500 watt generator run refrigerator, furnace blower, and lights?
- Will a 2500 watt generator run well pump and furnace blower?
- Will a 3000 watt generator run refrigerator, furnace blower, and lights?