Cost to Run a Tankless Electric Water Heater in Illinois
Illinois's average residential electricity rate is 19.2¢/kWh as of July 2026 — the 35th cheapest in the country, 5% above the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $73.54 per month.
Per hour
$3.46
at 13,000–27,000 W
Per day
$2.42
0.7 hours/day
Per month
$73.54
383 kWh
Per year
$883
4,599 kWh
By usage level in Illinois
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $1.21 | $36.77 | $442 |
| Typical (0.7 hrs/day) | $2.42 | $73.54 | $883 |
| Heavy (1.4 hrs/day) | $4.84 | $147 | $1,766 |
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 19.2¢/kWh (July 2026), a tankless electric water heater with typical usage costs about $2.42 per day, $73.54 per month, or $883 per year.
Is running a tankless electric water heater in Illinois more expensive than average?
Yes. Illinois's electricity costs about 5% more than the U.S. average, so the same usage costs $73.54 per month here versus $70.10 nationally.
What does electricity cost in Illinois right now?
Illinois residents pay an average of 19.2¢ per kWh as of July 2026 — the 35th cheapest rate of the 51 U.S. jurisdictions we track.