Yes the heating elements are flexible and are easy to damage and they carry current at mains potential. Neither of those outcomes favour failing safe. Even the

Yes the heating elements are flexible and are easy to damage and they carry current at mains potential. Neither of those outcomes favour failing safe. Even the best quality unheated wires carrying current don't last that long mechanically speaking. Add heat and the decay happens quicker. Humans are pretty good at warming a cold bed. Sucks for the first ten minutes though.