Q. How should a bathroom heater be installed?

Answer

It is recommended that you locate the wire supply in a central area where it may be run through the wall. Because doing so poses a risk of fire you won't be allowed to have it put behind a door or in any other location where it may be sealed off in any other way. The next step is for them to locate a stud in the wall and then trace the perimeter of the wall heater along the stud's border.