Tankless Water Heater (Electric) in St. Louis — $430/yr to Run (13.1¢/kWh)
Your tankless water heater (electric) in St. Louis costs about $36/month at 13.1¢/kWh. See daily, monthly, and yearly costs, plus tips to cut your bill.
St. Louis, MO Electricity Rate
13.1¢/kWh
Utility: Ameren Missouri
+1% vs national avg
National avg: 13.0¢/kWh
Daily Cost
$1.18
9.0 kWh/day
Monthly Cost
$35.86
274 kWh/mo
Annual Cost
$430
3,285 kWh/yr
Lifetime (20yr)
$8,607
energy only
Monthly Cost Breakdown in St. Louis
| Period | kWh | St. Louis Cost | National Avg | Difference |
|---|---|---|---|---|
| Daily | 9.0 | $1.18 | $1.17 | +$0.01 |
| Weekly | 63.0 | $8.25 | $8.19 | +$0.06 |
| Monthly | 273.8 | $35.86 | $35.59 | +$0.27 |
| Quarterly | 821.3 | $107.58 | $106.76 | +$0.82 |
| Annual | 3285.0 | $430.34 | $427.05 | +$3.29 |
Customize Your Tankless Water Heater (Electric) Cost
Adjust usage hours and electricity rate to calculate your exact cost in St. Louis.
Daily
$1.18
Monthly
$35.86
Annual
$430
20-Year
$8,607
Energy Saving Tips for Tankless Water Heater (Electric) in St. Louis
- ✓St. Louis electricity rates are 1% above the national average — energy efficiency matters more here.
- ✓An ENERGY STAR Tankless Water Heater (Electric) in St. Louis saves ~$86/year compared to standard models.
- ✓A smart Tankless Water Heater (Electric) with scheduling optimization can save ~$65/year at St. Louis 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 St. Louis saves approximately $86/year at local rates — $1,721 over the appliance lifetime.
Highest-Cost Appliances in St. Louis, MO
See which appliances cost the most to run at St. Louis's 13.1¢/kWh electricity rate.
Level 2 EV Charger (240V)
Transportation · 7,200W
$1,698/yr
$141.48/mo
Electric Furnace
HVAC · 10,000W
$1,179/yr
$98.25/mo
Electric Tankless Water Heater
Water Heating · 18,000W
$861/yr
$71.72/mo
EV Charger (Level 2)
Garage · 7,200W
$849/yr
$70.74/mo
Boiler (Electric)
HVAC · 6,000W
$707/yr
$58.95/mo
Electric Water Heater (Tank)
Water Heating · 4,500W
$646/yr
$53.79/mo
Water Heater (Tank Electric)
Water Heating · 4,500W
$646/yr
$53.79/mo
Heat Pump
HVAC · 2,400W
$503/yr
$41.92/mo
Tankless Water Heater (Electric) Cost in Other Missouri Cities
| City | Rate | Annual Cost | vs St. Louis |
|---|---|---|---|
| St. Louis (current) | 13.1¢ | $430 | — |
| Kansas City | 13.5¢ | $442 | +$12 |
| Springfield | 12.7¢ | $417 | $-14 |
| Columbia | 13.4¢ | $439 | +$9 |
| Independence | 13.9¢ | $455 | +$25 |
| Lee's Summit | 11.7¢ | $385 | $-46 |
| OFallon | 10.2¢ | $336 | $-95 |
| St. Joseph | 13.2¢ | $433 | +$2 |
| St. Charles | 13.3¢ | $436 | +$5 |
Tankless Water Heater (Electric) Energy Cost FAQ — St. Louis, MO
Understanding Tankless Water Heater (Electric) Energy Costs in St. Louis, MO
St. Louis is a mid-sized Missouri city where residential electricity rates from Ameren Missouri are shaped by regional energy supply and local demand patterns. Running a high-draw appliance like the Tankless Water Heater (Electric) (18,000W) at St. Louis's rate of 13.1¢/kWh costs approximately $430 per year — $3 more than the national average of $427.
St. Louis rates are 1% above the national average — a modest premium that adds $3 per year to Tankless Water Heater (Electric) operating costs. Over the appliance's 20-year lifespan, that's $66 in cumulative extra spending versus the national average.
With a cost of living index of 97, St. Louis is near the national median. The Tankless Water Heater (Electric)'s monthly cost of $35.86 represents a typical share of the average St. Louis electric bill of $101/month. Upgrading to an ENERGY STAR Tankless Water Heater (Electric) can cut energy use by up to 20%, saving approximately $86 per year at St. Louis rates.
St. Louis's moderate climate (avg 47.8°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. St. Louis 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 St. Louis.
Compare All Energy Costs in St. Louis
See energy costs for 178+ household appliances at St. Louis's local electricity rate.
Frequently Asked Questions
How much does it cost to run a Tankless Water Heater (Electric) in St. Louis, MO?
At St. Louis's average electricity rate of 13.1¢/kWh, a Tankless Water Heater (Electric) costs approximately $430 per year to run. That's about $35.86 per month with typical usage of 0.5 hours per day.
What is the electricity rate in St. Louis, MO?
The average residential electricity rate in St. Louis, MO is 13.1¢/kWh, which is 1% above the national average of 13.0¢/kWh. The primary utility provider is Ameren Missouri.
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 St. Louis?
Compared to the national average cost of $427/year, running a Tankless Water Heater (Electric) in St. Louis costs $3 more per year due to higher local electricity rates.
How can I reduce my Tankless Water Heater (Electric) energy cost in St. Louis?
To reduce Tankless Water Heater (Electric) costs in St. Louis: 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 Ameren Missouri for local energy efficiency rebates and programs.