Cost to Run a Tankless Electric Water Heater in Idaho
Idaho's average residential electricity rate is 13.7¢/kWh as of July 2026 — the 5th cheapest in the country, 25% below the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $52.48 per month.
Per hour
$2.47
at 13,000–27,000 W
Per day
$1.73
0.7 hours/day
Per month
$52.48
383 kWh
Per year
$630
4,599 kWh
By usage level in Idaho
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $0.86 | $26.24 | $315 |
| Typical (0.7 hrs/day) | $1.73 | $52.48 | $630 |
| Heavy (1.4 hrs/day) | $3.45 | $105 | $1,260 |
Idaho 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 Idaho?
At Idaho's current average residential rate of 13.7¢/kWh (July 2026), a tankless electric water heater with typical usage costs about $1.73 per day, $52.48 per month, or $630 per year.
Is running a tankless electric water heater in Idaho more expensive than average?
No — it's cheaper. Idaho's rate is about 25% below the U.S. average: $52.48 per month here versus $70.10 nationally.
What does electricity cost in Idaho right now?
Idaho residents pay an average of 13.7¢ per kWh as of July 2026 — the 5th cheapest rate of the 51 U.S. jurisdictions we track.