Stop using that extension cord immediately.

Yes. Unplug the heater. That warm plug means you’re overloading the cord, and that’s how electrical fires start.

Space heaters pull a ton of current — way more than a lamp or a phone charger. Most extension cords (especially the cheap 16-gauge ones) aren’t rated for that load. The warmth you feel is resistance turning into heat, which can melt the plug, the outlet, or worse.

You have two options: plug the heater directly into a wall outlet (best), or get a heavy-duty 12-gauge cord rated for at least 15 amps — and even then, check that it doesn’t get warm. But honestly, the safest move is no extension cord at all for a space heater.

Don’t ignore a warm plug. It’s not “fine.” It’s a warning.