Cost to Run a Heat Pump Water Heater in Montana
Montana's average residential electricity rate is 15¢/kWh as of July 2026 — the 15th cheapest in the country, 18% below the U.S. average. At typical usage (3 hours/day), a heat pump water heater here costs $13.68 per month.
Per hour
$0.15
at 400–1,500 W
Per day
$0.45
3 hours/day
Per month
$13.68
91 kWh
Per year
$164
1,095 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (1.5 hrs/day) | $0.22 | $6.84 | $82.13 |
| Typical (3 hrs/day) | $0.45 | $13.68 | $164 |
| Heavy (6 hrs/day) | $0.90 | $27.36 | $329 |
Montana vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a heat pump water heater in Montana?
At Montana's current average residential rate of 15¢/kWh (July 2026), a heat pump water heater with typical usage costs about $0.45 per day, $13.68 per month, or $164 per year.
Is running a heat pump water heater in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 18% below the U.S. average: $13.68 per month here versus $16.69 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 15¢ per kWh as of July 2026 — the 15th cheapest rate of the 51 U.S. jurisdictions we track.