Depends on the heating pad,
The zoomed pads have a safety cutoff I am not sure at what temp.
But the plastic that the pads are made of can't take high heat.
The max I have had a zoomed mini get up to was 110F and the max a zoomed medium was 120F
So if you are really concerned use a Rheostat and monitor the temp of the glass with a digital probe stuck to the glass with
some putty or tape.
and slowly increase the voltage until you get 80F make sure to make small adjustments and wait at least 10 min after each adjustment so you don't over shoot the target temp. also as the room temp changes the temp of the mat will change also.
so it is a good thing to keep an eye on it every once and a while.
and you should be good.
Now heat tape is another story all together it will go well above 120F and will cause burns.





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