How Many Amps Does an Electric Furnace Use?
Electric Furnace draws about 42 amps at 240 volts (10,000 watts running). Electric Furnace runs on its own dedicated 240 V circuit — a 10,000 W load calls for at least a 60 A double-pole breaker (your unit's nameplate may require more).
Amps = watts ÷ volts. Enter the wattage from your appliance's nameplate or label for an exact figure.
Current draw — an electric furnace
42 A
- At 240 V
- 10,000 W
- Typical breaker
- 60 A
Breaker figure is guidance for a simple resistive load, sized at 125% for continuous running — confirm against the nameplate and a licensed electrician.
Electric Furnace amperage at 120 V and 240 V
Same 10,000 W load — the current halves when the voltage doubles. Electric Furnace is typically a 240 V appliance in US homes.
| Draw | Watts | Amps at 120 V | Amps at 240 V |
|---|---|---|---|
| Running | 10,000 W | 83 A | 42 A |
Breaker and circuit for an electric furnace
Electric Furnace runs on its own dedicated 240 V circuit — a 10,000 W load calls for at least a 60 A double-pole breaker (your unit's nameplate may require more). For a dedicated circuit, guidance is a 60 A breaker with 6 AWG copper (75°C terminations) — sized at 125% of the running current because it runs 3+ hours at a time (NEC 210.20).
Guidance only — actual circuit sizing depends on your unit's nameplate, wire run length, and local code. Confirm with a licensed electrician. See the wire & breaker size chart for the full NEC ampacity table.
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