I was easily able to install the self-adhesive heating elements on the back of a very large mirror and wire them into the bathroom's ceiling fan circuit which I have put on a timer. I tested the glass temperature with an infrared thermometer and it heats up quickly (in my case, to around 28C from a starting temperature of around 20C) and is very effective at keeping the mirror completely fog free during long hot showers. It's a nice luxury to have.
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