# How to calculate expected temperature of a heating element?

I have a problem. I am suspecting heating mat I got is not working. It is barely warm to the touch, to the point I wonder if I'm imagining it. It's parameters are 230V, 16W, 26.5 x 28 cm. It's flat and supposed to have similar heating on both sides. Manufacturer declares almost all heat it gives is conductive. Ambient is 20 degree Celsius.

I can't find an equation to find out what expected temperature should be. I found equations for a wire, not for a pad.

Note, I will check it with ohmmeter when I'll get my electrical toolbox back. Or when I'll buy a new one. But the temperature calculation seems like a problem interesting enough in its own right.

• Anyone care to explain why it was perceived as unfocused? I believe I provided very specific description of the situation and precise question. Commented Feb 21, 2022 at 10:57
• Test it again sitting on a folded blanket with another folded blanket on top of it.
– user16324
Commented Feb 21, 2022 at 11:22
• I think you've misunderstood how these heat pads are supposed to be used. If you just sit it out on a surface in the open air then you shouldn't expect it to get very warm at all - the majority of its heating energy is just being dissipated into the air. If you rather wrap it inside some blankets or even just put it into a small enclosed space you'll see its effects much more noticeably. Put it on your chair and sit on it for 10 minutes - you'll soon notice its heating effect. Commented Feb 21, 2022 at 14:09