Tankless Water Heater (Electric) in Charleston — $479/yr to Run (14.6¢/kWh)
Your tankless water heater (electric) in Charleston costs about $40/month at 14.6¢/kWh. See daily, monthly, and yearly costs, plus tips to cut your bill.
Charleston, SC Electricity Rate
14.6¢/kWh
Utility: Duke Energy Carolinas
+12% vs national avg
National avg: 13.0¢/kWh
Daily Cost
$1.31
9.0 kWh/day
Monthly Cost
$39.94
274 kWh/mo
Annual Cost
$479
3,285 kWh/yr
Lifetime (20yr)
$9,586
energy only
Monthly Cost Breakdown in Charleston
| Period | kWh | Charleston Cost | National Avg | Difference |
|---|---|---|---|---|
| Daily | 9.0 | $1.31 | $1.17 | +$0.14 |
| Weekly | 63.0 | $9.19 | $8.19 | +$1.00 |
| Monthly | 273.8 | $39.94 | $35.59 | +$4.35 |
| Quarterly | 821.3 | $119.82 | $106.76 | +$13.06 |
| Annual | 3285.0 | $479.28 | $427.05 | +$52.23 |
Customize Your Tankless Water Heater (Electric) Cost
Adjust usage hours and electricity rate to calculate your exact cost in Charleston.
Daily
$1.31
Monthly
$39.94
Annual
$479
20-Year
$9,586
Energy Saving Tips for Tankless Water Heater (Electric) in Charleston
- ✓Charleston electricity rates are 12% above the national average — energy efficiency matters more here.
- ✓An ENERGY STAR Tankless Water Heater (Electric) in Charleston saves ~$96/year compared to standard models.
- ✓A smart Tankless Water Heater (Electric) with scheduling optimization can save ~$72/year at Charleston rates.
- ✓Provides hot water on demand with no standby loss
- ✓Flush annually to remove scale
- ✓Requires dedicated electrical circuit
ENERGY STAR Savings: Upgrading to an ENERGY STAR Tankless Water Heater (Electric) in Charleston saves approximately $96/year at local rates — $1,917 over the appliance lifetime.
Highest-Cost Appliances in Charleston, SC
See which appliances cost the most to run at Charleston's 14.6¢/kWh electricity rate.
Level 2 EV Charger (240V)
Transportation · 7,200W
$1,891/yr
$157.57/mo
Electric Furnace
HVAC · 10,000W
$1,313/yr
$109.42/mo
Electric Tankless Water Heater
Water Heating · 18,000W
$959/yr
$79.88/mo
EV Charger (Level 2)
Garage · 7,200W
$945/yr
$78.79/mo
Boiler (Electric)
HVAC · 6,000W
$788/yr
$65.66/mo
Electric Water Heater (Tank)
Water Heating · 4,500W
$719/yr
$59.91/mo
Water Heater (Tank Electric)
Water Heating · 4,500W
$719/yr
$59.91/mo
Heat Pump
HVAC · 2,400W
$560/yr
$46.69/mo
Tankless Water Heater (Electric) Cost in Other South Carolina Cities
| City | Rate | Annual Cost | vs Charleston |
|---|---|---|---|
| Charleston (current) | 14.6¢ | $479 | — |
| Columbia | 13.4¢ | $441 | $-38 |
| North Charleston | 13.6¢ | $446 | $-33 |
| Mount Pleasant | 13.0¢ | $427 | $-52 |
| Rock Hill | 11.7¢ | $383 | $-97 |
| Greenville | 15.0¢ | $494 | +$15 |
| Summerville | 14.4¢ | $475 | $-5 |
Tankless Water Heater (Electric) Energy Cost FAQ — Charleston, SC
Understanding Tankless Water Heater (Electric) Energy Costs in Charleston, SC
Charleston is a mid-sized South Carolina city where residential electricity rates from Duke Energy Carolinas are shaped by regional energy supply and local demand patterns. Running a high-draw appliance like the Tankless Water Heater (Electric) (18,000W) at Charleston's rate of 14.6¢/kWh costs approximately $479 per year — $52 more than the national average of $427.
Charleston rates are 12% above the national average — a modest premium that adds $52 per year to Tankless Water Heater (Electric) operating costs. Over the appliance's 20-year lifespan, that's $1,045 in cumulative extra spending versus the national average.
With a cost of living index of 97, Charleston is near the national median. The Tankless Water Heater (Electric)'s monthly cost of $39.94 represents a typical share of the average Charleston electric bill of $157/month. Upgrading to an ENERGY STAR Tankless Water Heater (Electric) can cut energy use by up to 20%, saving approximately $96 per year at Charleston rates.
Charleston's moderate climate (avg 66.2°F) helps keep seasonal energy cost swings manageable for most appliances. A Tankless Water Heater (Electric) produces approximately 2.35 tons of CO2 annually at typical usage. Charleston residents can reduce this footprint by choosing an ENERGY STAR certified unit, optimizing usage patterns, or investing in solar — see our solar savings calculator for Charleston.
Compare All Energy Costs in Charleston
See energy costs for 178+ household appliances at Charleston's local electricity rate.
Frequently Asked Questions
How much does it cost to run a Tankless Water Heater (Electric) in Charleston, SC?
At Charleston's average electricity rate of 14.6¢/kWh, a Tankless Water Heater (Electric) costs approximately $479 per year to run. That's about $39.94 per month with typical usage of 0.5 hours per day.
What is the electricity rate in Charleston, SC?
The average residential electricity rate in Charleston, SC is 14.6¢/kWh, which is 12% above the national average of 13.0¢/kWh. The primary utility provider is Duke Energy Carolinas.
How much electricity does a Tankless Water Heater (Electric) use per year?
A Tankless Water Heater (Electric) uses approximately 18,000 watts and consumes about 3,285 kWh per year with typical usage of 0.5 hours/day for 365 days/year.
Is a Tankless Water Heater (Electric) expensive to run in Charleston?
Compared to the national average cost of $427/year, running a Tankless Water Heater (Electric) in Charleston costs $52 more per year due to higher local electricity rates.
How can I reduce my Tankless Water Heater (Electric) energy cost in Charleston?
To reduce Tankless Water Heater (Electric) costs in Charleston: Provides hot water on demand with no standby loss. Flush annually to remove scale. Upgrading to an ENERGY STAR model saves up to 20% on energy costs. Also check with Duke Energy Carolinas for local energy efficiency rebates and programs.