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What size generator or power station for an electric water heater? (5,000+ W)
To run an electric water heater, choose at least
5,000 W running.
5,000 W running.
An electric water heater draws about 4,000 W while running. Pick a generator, inverter or power station rated comfortably above these numbers.
Battery runtime calculator
Estimated runtime—
Assumes about 85% usable capacity. Motors need extra headroom for startup surge.
How long a power station lasts
| Power station | Estimated runtime |
|---|---|
| 300 Wh | 0 h 4 min |
| 500 Wh | 0 h 6 min |
| 1,000 Wh | 0 h 13 min |
| 2,000 Wh | 0 h 26 min |
| 3,000 Wh | 0 h 38 min |
Sizing guide
| Minimum running watts | 5,000 W |
| Minimum starting watts | 5,000 W |
| Suggested inverter | 5,000 W or higher |
See also electric water heater wattage and running cost.
FAQ
How many watts does an electric water heater use?
Tank models use about 3000-5500 watts while the element is heating.
How can I cut water heating costs?
Lower the thermostat to 120F, insulate the tank and fix hot-water leaks.
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