5 Things to Know About Extension Cord Gauge for Space Heaters
- Ignore marketing labels like “heavy duty” or “contractor grade” and check the actual wire gauge instead.
- Look for 12 AWG (American Wire Gauge) or lower for a space heater pulling 12 to 15 amps continuously.
- Most household cords are 16 AWG or thinner, which can overheat and melt under sustained load from a heater.
- If the cord doesn’t clearly show the AWG number on the jacket, do not buy it.
- Never use a cord that feels warm to the touch after an hour of use—that heat can start a fire.