Yeah sorry, i just read my post and i can understand why anyone would be confused with it. I was basically saying that heat has a few different types, Dry,ice and moist and these would have different effects on your brush, for instance if you held the brush over a lighter i imagine it would burn the hairs very quick but in water i guess it would just losen the knot. Either way i would much prefer using a mug standing in hot water than an electrical pad.

I used to use a Repti-pad for my Lizard and this used to get really hot that if left on over night it may burn my lizard through a 3/4 length sheet of MDF.