Cost to Run a Tankless Electric Water Heater in South Carolina
South Carolina's average residential electricity rate is 17.1¢/kWh as of April 2026 — the 29th cheapest in the country, 9% below the U.S. average. At typical usage (0.7 hours/day), a tankless electric water heater here costs $65.50 per month.
Per hour
$3.08
at 13,000–27,000 W
Per day
$2.15
0.7 hours/day
Per month
$65.50
383 kWh
Per year
$786
4,599 kWh
By usage level in South Carolina
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (0.5 hrs/day) | $1.08 | $32.75 | $393 |
| Typical (0.7 hrs/day) | $2.15 | $65.50 | $786 |
| Heavy (1.4 hrs/day) | $4.31 | $131 | $1,573 |
South Carolina 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 South Carolina?
At South Carolina's current average residential rate of 17.1¢/kWh (April 2026), a tankless electric water heater with typical usage costs about $2.15 per day, $65.50 per month, or $786 per year.
Is running a tankless electric water heater in South Carolina more expensive than average?
No — it's cheaper. South Carolina's rate is about 9% below the U.S. average: $65.50 per month here versus $72.01 nationally.
What does electricity cost in South Carolina right now?
South Carolina residents pay an average of 17.1¢ per kWh as of April 2026 — the 29th cheapest rate of the 51 U.S. jurisdictions we track.