How many watts does an electric water heater use?
An electric water heater uses 3,000–5,500 W (about 4,500 W on average). Running 2.5 hours/day, that is about 11.25 kWh a day and 337.5 kWh a month — roughly $61.90 a month at the U.S. average rate of 18.34 ¢/kWh.
This is the electric water heater electricity usage reference: watts, amps on a 240 V circuit, the kWh math, and links to what that usage costs in each state.
Watts, amps, and kWh for an electric water heater
| Measure | Value |
|---|---|
| Rated wattage range | 3,000–5,500 W |
| Average draw used in our math | 4,500 W |
| Amps at 240 V | 13–23 A (19 A at the average draw) |
| kWh per hour | 4.50 kWh |
| kWh per day at 2.5 hours/day | 11.25 kWh |
| kWh per month | 337.5 kWh |
| Cost per month at the U.S. average (18.34 ¢/kWh) | $61.90 |
The math is kWh = watts × hours ÷ 1000 and amps = watts ÷ volts. An electric water heater is normally wired for 240 V in US homes; a 120 V unit of the same wattage would draw twice the amps. For the dollars in your state, open cost to run an electric water heater in Texas and switch states from there.
Electric Water Heater electricity usage profile
| Metric | Value |
|---|---|
| kWh per hour | 4.50 kWh |
| kWh per day (typical) | 11.25 kWh |
| kWh per month (typical) | 337.5 kWh |
| kWh per year (typical) | 4106.3 kWh |
| Low runtime scenario | 1.25 hours/day |
| High runtime scenario | 4.5 hours/day |
Connect usage to cost tools
Related appliance usage pages
Source & Method
Source: U.S. Energy Information Administration (EIA) Retail Sales of Electricity. Last dataset period: June 2026. Usage calculations use fixed appliance wattage and runtime assumptions so results stay comparable across pages.
Frequently asked questions
How many watts does an electric water heater use?
An electric water heater uses 3,000–5,500 W (about 4,500 W on average). Our usage and cost math uses 4,500 watts running 2.5 hours/day.
How many amps does an electric water heater draw?
On a 240 V circuit, 3,000–5,500 W works out to about 13–23 A; at the 4,500 W we use in the math that is 19 A.
How much electricity does an electric water heater use per month?
About 337.5 kWh a month at 2.5 hours/day. Lighter use (1.25 hours/day) comes to roughly 168.8 kWh and heavier use (4.5 hours/day) roughly 607.5 kWh.
How much does it cost to run an electric water heater?
About $61.90 a month at the U.S. average rate of 18.34 ¢/kWh — from roughly $44.25 in Nevada to $177.93 in Hawaii at the same usage. The state cost-to-run pages price it at every state's rate.