Cost to Run a Tankless Electric Water Heater in Washington
Washington's average residential electricity rate is 15¢/kWh as of May 2026 — the 16th cheapest in the country, 18% below the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $57.46 per month.
Per hour
$2.70
at 13,000–27,000 W
Per day
$1.89
0.7 hours/day
Per month
$57.46
383 kWh
Per year
$690
4,599 kWh
By usage level in Washington
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $0.94 | $28.73 | $345 |
| Typical (0.7 hrs/day) | $1.89 | $57.46 | $690 |
| Heavy (1.4 hrs/day) | $3.78 | $115 | $1,380 |
Washington 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 Washington?
At Washington's current average residential rate of 15¢/kWh (May 2026), a tankless electric water heater with typical usage costs about $1.89 per day, $57.46 per month, or $690 per year.
Is running a tankless electric water heater in Washington more expensive than average?
No — it's cheaper. Washington's rate is about 18% below the U.S. average: $57.46 per month here versus $70.48 nationally.
What does electricity cost in Washington right now?
Washington residents pay an average of 15¢ per kWh as of May 2026 — the 16th cheapest rate of the 51 U.S. jurisdictions we track.