Cost to Run a Tankless Electric Water Heater in Hawaii
Hawaii's average residential electricity rate is 52¢/kWh as of May 2026 — the 51st cheapest in the country, 183% above the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $199 per month.
Per hour
$9.36
at 13,000–27,000 W
Per day
$6.55
0.7 hours/day
Per month
$199
383 kWh
Per year
$2,391
4,599 kWh
By usage level in Hawaii
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $3.28 | $99.59 | $1,196 |
| Typical (0.7 hrs/day) | $6.55 | $199 | $2,391 |
| Heavy (1.4 hrs/day) | $13.10 | $398 | $4,783 |
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 52¢/kWh (May 2026), a tankless electric water heater with typical usage costs about $6.55 per day, $199 per month, or $2,391 per year.
Is running a tankless electric water heater in Hawaii more expensive than average?
Yes. Hawaii's electricity costs about 183% more than the U.S. average, so the same usage costs $199 per month here versus $70.48 nationally.
What does electricity cost in Hawaii right now?
Hawaii residents pay an average of 52¢ per kWh as of May 2026 — the 51st cheapest rate of the 51 U.S. jurisdictions we track.