Cost to Run a Tankless Electric Water Heater in Illinois
Illinois's average residential electricity rate is 23.9¢/kWh as of May 2026 — the 40th cheapest in the country, 30% above the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $91.55 per month.
Per hour
$4.30
at 13,000–27,000 W
Per day
$3.01
0.7 hours/day
Per month
$91.55
383 kWh
Per year
$1,099
4,599 kWh
By usage level in Illinois
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $1.51 | $45.77 | $550 |
| Typical (0.7 hrs/day) | $3.01 | $91.55 | $1,099 |
| Heavy (1.4 hrs/day) | $6.02 | $183 | $2,198 |
Illinois 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 Illinois?
At Illinois's current average residential rate of 23.9¢/kWh (May 2026), a tankless electric water heater with typical usage costs about $3.01 per day, $91.55 per month, or $1,099 per year.
Is running a tankless electric water heater in Illinois more expensive than average?
Yes. Illinois's electricity costs about 30% more than the U.S. average, so the same usage costs $91.55 per month here versus $70.48 nationally.
What does electricity cost in Illinois right now?
Illinois residents pay an average of 23.9¢ per kWh as of May 2026 — the 40th cheapest rate of the 51 U.S. jurisdictions we track.