Cost to Run a Tankless Electric Water Heater in Hawaii
Hawaii's average residential electricity rate is 48¢/kWh as of July 2026 — the 51st cheapest in the country, 162% above the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $184 per month.
Per hour
$8.64
at 13,000–27,000 W
Per day
$6.05
0.7 hours/day
Per month
$184
383 kWh
Per year
$2,208
4,599 kWh
By usage level in Hawaii
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $3.02 | $91.93 | $1,104 |
| Typical (0.7 hrs/day) | $6.05 | $184 | $2,208 |
| Heavy (1.4 hrs/day) | $12.10 | $368 | $4,415 |
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 48¢/kWh (July 2026), a tankless electric water heater with typical usage costs about $6.05 per day, $184 per month, or $2,208 per year.
Is running a tankless electric water heater in Hawaii more expensive than average?
Yes. Hawaii's electricity costs about 162% more than the U.S. average, so the same usage costs $184 per month here versus $70.10 nationally.
What does electricity cost in Hawaii right now?
Hawaii residents pay an average of 48¢ per kWh as of July 2026 — the 51st cheapest rate of the 51 U.S. jurisdictions we track.