Cost to Run a Tankless Electric Water Heater in Illinois
Illinois's average residential electricity rate is 20.5¢/kWh as of April 2026 — the 36th cheapest in the country, 9% above the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $78.52 per month.
Per hour
$3.69
at 13,000–27,000 W
Per day
$2.58
0.7 hours/day
Per month
$78.52
383 kWh
Per year
$943
4,599 kWh
By usage level in Illinois
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $1.29 | $39.26 | $471 |
| Typical (0.7 hrs/day) | $2.58 | $78.52 | $943 |
| Heavy (1.4 hrs/day) | $5.17 | $157 | $1,886 |
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 20.5¢/kWh (April 2026), a tankless electric water heater with typical usage costs about $2.58 per day, $78.52 per month, or $943 per year.
Is running a tankless electric water heater in Illinois more expensive than average?
Yes. Illinois's electricity costs about 9% more than the U.S. average, so the same usage costs $78.52 per month here versus $72.01 nationally.
What does electricity cost in Illinois right now?
Illinois residents pay an average of 20.5¢ per kWh as of April 2026 — the 36th cheapest rate of the 51 U.S. jurisdictions we track.