Cost to run a electric water heater
Short answer
Running a electric water heater (~4000W, ~3 hrs/day) costs about $2.02/day, $61/month, or $736/year at the U.S. average of 16.8¢/kWh.
Wattage
4000 W
Per day
$2.02
Per month
$61
Per year
$736
Figures assume ~4000W for ~3 hours a day at the U.S. average 16.8¢/kWh. Your state's rate and your real usage change the total — enter both in the calculator.
What makes a electric water heater cost what it does
A electric water heater draws about 4000W and runs roughly 3 hours a day in a typical home. Run the standard formula — watts ÷ 1,000 × hours × your electricity rate — and at the U.S. average of 16.8¢/kWh that's about $2.02/day, $61/month, or $736/year.
Two things move that figure most: how many hours it actually runs and what you pay per kilowatt-hour. It runs on a duty cycle through the day, so small rate changes add up over a year. A electric water heater nominally at 4000W but used half as often costs roughly half as much — usage, not the nameplate rating, decides the bill.
Your electricity rate does the rest of the work. The same electric water heater costs about $460/year in a low-rate state like Idaho (10.5¢/kWh) but $1,840/year in Hawaii (42¢/kWh) — roughly a 4× swing for the identical appliance.
What determines the cost
| Factor | Effect on cost |
|---|---|
| Wattage | A electric water heater pulls about 4000W while running |
| Hours of use | Typically ~3 hr/day — double the hours and you double the cost |
| Electricity rate | What you pay per kWh (U.S. average 16.8¢) scales the whole bill |
| Efficiency & age | Newer, Energy-Star models draw less for the same job |
| Settings & duty cycle | It runs on a duty cycle through the day, so small rate changes add up over a year |
| Standby draw | Many devices keep sipping power even when idle or 'off' |
Cost by electricity rate
Yearly cost to run this electric water heater at a low, average, and high state electricity rate.
| Rate | Yearly cost |
|---|---|
| Low rate (Idaho, 10.5¢) | $460/yr |
| U.S. average (16.8¢) | $736/yr |
| High rate (Hawaii, 42¢) | $1,840/yr |
How to cut what a electric water heater costs
- Cut runtime first: every hour you don't run the electric water heater is the cleanest saving, since cost is hours × watts × rate.
- Check your actual electricity rate — if you're above the 16.8¢ U.S. average, the electric water heater costs more than the headline figure here.
- Lower the setpoint and add insulation or a timer; a electric water heater runs on a duty cycle, so trimming it pays back all year.
- Enter your own wattage, hours, and rate in the calculator for a electric water heater figure tuned to your home.
Your rate & usage
Open the cost calculatorOther appliances
Frequently asked questions
How much does it cost to run a electric water heater?
About $2.02 per day, $61 per month, or $736 per year at the U.S. average of 16.8¢/kWh, assuming ~4000W for ~3 hours a day.
How many watts does a electric water heater use?
A typical electric water heater draws about 4000 watts when running. Your model may differ — check its label or a plug-in power meter and enter the real number in the calculator.
How can I cut the cost of running a electric water heater?
Run it less, use a more efficient model, and check whether your utility offers cheaper off-peak (time-of-use) rates. Costs also vary 4× by state, so your local rate matters a lot.