Cost to run an electric water heater in Hawaii

$1.89/hour

Electric Water Heater at 4,000 W in Hawaii (47.18¢/kWh) · $172.11/month at 3 h/day

By hours of use

Use	Per day	Per month	Per year
1 h/day	$1.89	$57.37	$688.83
2 h/day	$3.77	$114.74	$1,377.66
3 h/day	$5.66	$172.11	$2,066.48
4 h/day	$7.55	$229.48	$2,755.31
8 h/day	$15.10	$458.97	$5,510.62
12 h/day	$22.65	$688.45	$8,265.94
24 h/day	$45.29	$1,376.90	$16,531.87

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.

How much does it cost to run an electric water heater in Hawaii?

At 4,000 W and 47.18¢/kWh: $1.89 per hour, $5.66 per day and $172.11 per month at 3 h/day.

How does Hawaii 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).

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