Cost to Run a Tankless Electric Water Heater in Montana
Montana's average residential electricity rate is 13.9¢/kWh as of April 2026 — the 7th cheapest in the country, 26% below the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $53.24 per month.
Per hour
$2.50
at 13,000–27,000 W
Per day
$1.75
0.7 hours/day
Per month
$53.24
383 kWh
Per year
$639
4,599 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $0.88 | $26.62 | $320 |
| Typical (0.7 hrs/day) | $1.75 | $53.24 | $639 |
| Heavy (1.4 hrs/day) | $3.50 | $106 | $1,279 |
Montana 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 Montana?
At Montana's current average residential rate of 13.9¢/kWh (April 2026), a tankless electric water heater with typical usage costs about $1.75 per day, $53.24 per month, or $639 per year.
Is running a tankless electric water heater in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 26% below the U.S. average: $53.24 per month here versus $72.01 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 13.9¢ per kWh as of April 2026 — the 7th cheapest rate of the 51 U.S. jurisdictions we track.