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Cost to run an electric water heater in California
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$1.19/hour
Electric Water Heater at 4,000 W in California (29.75¢/kWh) · $108.53/month at 3 h/day
By hours of use
| Use | Per day | Per month | Per year |
|---|---|---|---|
| 1 h/day | $1.19 | $36.18 | $434.35 |
| 2 h/day | $2.38 | $72.35 | $868.70 |
| 3 h/day | $3.57 | $108.53 | $1,303.05 |
| 4 h/day | $4.76 | $144.70 | $1,737.40 |
| 8 h/day | $9.52 | $289.41 | $3,474.80 |
| 12 h/day | $14.28 | $434.11 | $5,212.20 |
| 24 h/day | $28.56 | $868.22 | $10,424.40 |
Tank water heaters use 3,000-5,500 W elements; a family typically runs them 2-4 hours a day. Heat-pump models use about a third.
Same appliance, nearby states
| State | ¢/kWh | Per month |
|---|---|---|
| California | 29.75 | $108.53 |
| Rhode Island | 28.18 | $102.80 |
| New York | 28.65 | $104.52 |
| Alaska | 29.41 | $107.29 |
| Massachusetts | 30.48 | $111.19 |
| Maine | 32.11 | $117.14 |
| Hawaii | 47.18 | $172.11 |
FAQ
How much does it cost to run an electric water heater in California?
At 4,000 W and 29.75¢/kWh: $1.19 per hour, $3.57 per day and $108.53 per month at 3 h/day.
How does California compare with other states?
The same use costs $46.40/month in Nevada (cheapest) and $172.11/month in Hawaii (most expensive); the US average is $66.25.
Price: EIA Electric Power Monthly, Table 5.6.A (residential, August 2026 preliminary; released October 23, 2026).
Electric Water Heater cost calculator · Electricity cost in California
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