Heat pad adhesive recommendation

Foil tape is flammable if you get it hot enough... The thing is, a heat pad can't get hot enough to light the glue or foil tape on fire though.

Despite wanting a permanent adhesive, I would have to recommend instead a `durable`adhesive.
It would royally bite if you had to replace a thermostat probe wedged between heat tape or a UHT that was fixed with crazy glue.
Aluminum tape strikes me as the better choice serving 2 purposes, and still being removable if need arises.

Yeah; I always used the foil tape. Tape it nice and snugly against the tub, and it stays for awhile. :)