Cost to run a 4000W electric water heater
How much does it cost to run a 4000W electric water heater? At 4000 watts, the cost depends on how many hours a day you use it and your price per kilowatt-hour. The calculator below is preset to 4000W; the table shows the monthly cost across daily-use hours and electricity prices.
Your numbers
Cost per month
$82
kWh per month
480 kWh
Cost per day
$3
Cost per year
$993
| Hours/day | $0.15/kWh | $0.25/kWh | $0.35/kWh |
|---|---|---|---|
| 2 h | $36 | $60 | $84 |
| 4 h | $72 | $120 | $168 |
| 8 h | $144 | $240 | $336 |
| 24 h | $432 | $720 | $1,008 |
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How do I calculate the cost of running an appliance?
Multiply the power in watts by hours used and divide by 1,000 to get kilowatt-hours (kWh), then multiply by your price per kWh. This calculator does it for a day, month and year automatically.
Where do I find an appliance's wattage?
On the rating label (often on the back or base) or in the manual. If only volts and amps are listed, multiply them to get watts.
What uses the most electricity at home?
Heating, cooling and anything that runs constantly — electric heaters, air conditioning, water heaters and older fridges — typically account for the largest share of a bill.
CostTrek provides general information, not financial advice. Results are estimates based on the figures you enter; your actual rate, taxes and insurance will vary.