How many watts does an electric furnace use?
An electric furnace uses 10,000–20,000 W (about 15,000 W on average). Running 4 hours/day, that is about 60.00 kWh a day and 1800.0 kWh a month — roughly $329.58 a month at the U.S. average rate of 18.31 ¢/kWh.
This is the electric furnace 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 furnace
| Measure | Value |
|---|---|
| Rated wattage range | 10,000–20,000 W |
| Average draw used in our math | 15,000 W |
| Amps at 240 V | 42–83 A (63 A at the average draw) |
| kWh per hour | 15.00 kWh |
| kWh per day at 4 hours/day | 60.00 kWh |
| kWh per month | 1800.0 kWh |
| Cost per month at the U.S. average (18.31 ¢/kWh) | $329.58 |
The math is kWh = watts × hours ÷ 1000 and amps = watts ÷ volts. An electric furnace 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 furnace in Texas and switch states from there.
Electric Furnace electricity usage profile
| Metric | Value |
|---|---|
| kWh per hour | 15.00 kWh |
| kWh per day (typical) | 60.00 kWh |
| kWh per month (typical) | 1800.0 kWh |
| kWh per year (typical) | 21900.0 kWh |
| Low runtime scenario | 2 hours/day |
| High runtime scenario | 6 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: July 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 furnace use?
An electric furnace uses 10,000–20,000 W (about 15,000 W on average). Our usage and cost math uses 15,000 watts running 4 hours/day.
How many amps does an electric furnace draw?
On a 240 V circuit, 10,000–20,000 W works out to about 42–83 A; at the 15,000 W we use in the math that is 63 A.
How much electricity does an electric furnace use per month?
About 1800.0 kWh a month at 4 hours/day. Lighter use (2 hours/day) comes to roughly 900.0 kWh and heavier use (6 hours/day) roughly 2700.0 kWh.
How much does it cost to run an electric furnace?
About $329.58 a month at the U.S. average rate of 18.31 ¢/kWh — from roughly $228.96 in Louisiana to $864.00 in Hawaii at the same usage. The state cost-to-run pages price it at every state's rate.