| Watts per sq ft used | 10 (extra heat for a room that is already heated) |
|---|---|
| Heat output | 1,500 W = 5,118 BTU per hour |
| 1,500 W plug-in heaters | One |
| Running cost at full power | $0.27 per hour |
A 1,500 W heater draws 12.5 amps at 120 volts. If yours has a thermostat, it switches off once the room is warm, so the hourly cost above is the most it can use.