The electric heating foil to be fixed to the mirror back surface.
The mirrors steaming is the common phenomenon, when the water is used in the room, the water in a steam form deposits on the mirror surface.
The small direct heating causes the instant mirror cleaning form the steam. The heating foil may be used with all mirrors, located in the accommodation and utilitarian rooms (bathrooms, laundries, swimming pools, etc.)
If the mirror dimensions are bigger than the foil dimensions, shown in the table, there is a possibility to use a few foil pieces. Usually it is 200 W/m2.