Heat pump water heaters move heat from air into the tank, using only 500–2,000 watts compared to resistive heaters. They take longer to heat water and work best in warm environments, but they're 2–3 times more efficient over time.
| Basis | Cost |
|---|---|
| Per hour (while running, 550 W typical) | $0.10 |
| Per day (4 h/day, 7/7 days) | $0.41 |
| Per month | $12.61 |
| Per year | $151.31 |
| Hourly range (small 400 W – large 700 W) | $0.075 – $0.13 |
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