I'm not sure if my friends in the UK/Ireland and other places have a heater in the Bathroom.
But anyhow, I used to get these types of heaters all the time, to take back to the workshop, to blow all of the accumulated dust and other rubbish out of them.
Up-shot of this topic is, if not maintained well, these plastic heaters can be a fire hazard.
They have an over-temperature cut-out on them, but often, it never trips until 100C is reached.
Plastic on these heaters often melts at 85C.
But, if people would just get the things blown out with compressed air every so often, we would save a few house fires.