Cost to Run a Tankless Electric Water Heater in Hawaii
Hawaii's average residential electricity rate is 46.6¢/kWh as of April 2026 — the 51st cheapest in the country, 148% above the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $178 per month.
Per hour
$8.39
at 13,000–27,000 W
Per day
$5.87
0.7 hours/day
Per month
$178
383 kWh
Per year
$2,143
4,599 kWh
By usage level in Hawaii
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $2.94 | $89.25 | $1,072 |
| Typical (0.7 hrs/day) | $5.87 | $178 | $2,143 |
| Heavy (1.4 hrs/day) | $11.74 | $357 | $4,286 |
Hawaii vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a tankless electric water heater in Hawaii?
At Hawaii's current average residential rate of 46.6¢/kWh (April 2026), a tankless electric water heater with typical usage costs about $5.87 per day, $178 per month, or $2,143 per year.
Is running a tankless electric water heater in Hawaii more expensive than average?
Yes. Hawaii's electricity costs about 148% more than the U.S. average, so the same usage costs $178 per month here versus $72.01 nationally.
What does electricity cost in Hawaii right now?
Hawaii residents pay an average of 46.6¢ per kWh as of April 2026 — the 51st cheapest rate of the 51 U.S. jurisdictions we track.