How many watts does a space heater use?
Every number here comes from a named source. Generator charts give a generous figure for sizing a generator or power station. Test data and manufacturer specs show what the appliance draws.
- Running
- 1,500 W
- Voltage
- 120 V
How long it runs on a battery
| Battery | Runtime |
|---|---|
| 1 kWh | 0.6 h |
| 2 kWh | 1.1 h |
| 3 kWh | 1.7 h |
| 5 kWh | 2.8 h |
Running nonstop at 1,500 W, with 85% of the battery usable after inverter losses.
What each source says
| Figure | Value | Source and basis |
|---|---|---|
| Running | 1,500 (750 to 1,500) W | Vornado VH2 specifications (Sylvane listing)Vornado VH2: 1,500 W high, 750 W low, 12.5 A maximum. |
| Running | 1,500 W | EWEB, Generator Sizing ConsiderationsGenerator sizing chart, space heater. |
Good to know
- Vornado and the EWEB chart both list 1,500 W on high, which is 12.5 A at 120 V.
- A heating element has no motor surge, but 1,500 W drains a battery fast: about 1.5 kWh every hour on high.