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Cost to run an electric water heater in Montana
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$0.62/hour
Electric Water Heater at 4,000 W in Montana (15.57¢/kWh) · $56.80/month at 3 h/day
By hours of use
| Use | Per day | Per month | Per year |
|---|---|---|---|
| 1 h/day | $0.62 | $18.93 | $227.32 |
| 2 h/day | $1.25 | $37.87 | $454.64 |
| 3 h/day | $1.87 | $56.80 | $681.97 |
| 4 h/day | $2.49 | $75.73 | $909.29 |
| 8 h/day | $4.98 | $151.46 | $1,818.58 |
| 12 h/day | $7.47 | $227.20 | $2,727.86 |
| 24 h/day | $14.95 | $454.39 | $5,455.73 |
Tank water heaters use 3,000-5,500 W elements; a family typically runs them 2-4 hours a day. Heat-pump models use about a third.
Same appliance, nearby states
| State | ¢/kWh | Per month |
|---|---|---|
| Montana | 15.57 | $56.80 |
| Arizona | 15.05 | $54.90 |
| South Dakota | 15.15 | $55.27 |
| Kansas | 15.47 | $56.43 |
| South Carolina | 15.76 | $57.49 |
| Georgia | 15.90 | $58.00 |
| Texas | 15.91 | $58.04 |
FAQ
How much does it cost to run an electric water heater in Montana?
At 4,000 W and 15.57¢/kWh: $0.62 per hour, $1.87 per day and $56.80 per month at 3 h/day.
How does Montana compare with other states?
The same use costs $46.40/month in Nevada (cheapest) and $172.11/month in Hawaii (most expensive); the US average is $66.25.
Price: EIA Electric Power Monthly, Table 5.6.A (residential, August 2026 preliminary; released October 23, 2026).
Electric Water Heater cost calculator · Electricity cost in Montana
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