Tankless water heater Electricity Cost in Hawaii — $214.87/month (2026)
Hawaii monthly
$214.87
U.S. average monthly
$97.08
Difference
+$117.79
← Tankless water heater (all states) · Hawaii electricity rate
Quick rate
Daily cost
$7.16
Monthly cost
$214.87
+$0.00 vs typical
Yearly cost
$2614.20
kWh / month
540.0 kWh
Local monthly estimate: $214.87 · U.S. average equivalent: $97.08
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ad-after-calculator Quick answer
Running a typical tankless water heater in Hawaii costs about $7.16/day or $214.87/month at roughly $0.398/kWh, assuming 1 hours of use per day at 18000 W. The U.S. average rate is about $0.180/kWh, so Hawaii is roughly 121% higher than average for this estimate.
vs U.S. average
Local rate (Hawaii)
$0.398/kWh
Monthly estimate: $214.87
U.S. average rate
$0.180/kWh
Monthly estimate: $97.08
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ad-after-state-table FAQ
- Most tankless water heater units fall between 12000 W and 24000 W, with 18000 W as a typical value for estimates.
- Our calculator uses 18000 W as the typical wattage, within a reported range of 12000–24000 W.
- At 1 hours/day and 18000 W, the estimate is about 18.00 kWh per day.
- Using 1 hours/day, the estimate is about 540.0 kWh per month.
- Per hour, tankless water heater uses about 18.000 kWh (at 18000 W).
- At typical use (18000 W and 1 hours/day), the estimate is about $7.16/day at roughly $0.398/kWh.
- At typical use (18000 W and 1 hours/day), the estimate is about $214.87/month at roughly $0.398/kWh.
- Running for one hour at 18000 W costs about $7.162 per hour (using the Hawaii rate of about $0.398/kWh).
- For typical use, the calculator estimates about $214.87/month for tankless water heater in Hawaii.
- At the typical Hawaii residential rate, the estimate is about 540.0 kWh per month, which corresponds to roughly $214.87/month for tankless water heater.
- Compared to the U.S. average, Hawaii is about 121% higher for this estimate. Monthly cost is about $214.87 in Hawaii vs $97.08 at the national average.
- Start with practical steps from our tips list (e.g., Turn the appliance off as soon as you are done using it.). Smaller changes reduce kWh usage, which reduces the bill at your local rate.
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Est. monthly at Hawaii rate ($0.398/kWh)