Abstract: An electrical heating device for a mirror includes a pair of electrically conductive heating lining plates providing for heat distribution on a mirror, and electrical conductors connected to the plates for connecting the plates to a source of power. An insulating layer is disposed between the plates, the insulating layer having openings, and PTC resistor platelettes disposed in the openings and in electrical contact with the pair of plates. One of the plates has a larger area than the insulating layer such that an outer peripheral edge portion of the one plate is spaced outwardly of the outer peripheral edge of the insulating layer, the other of the pair of plates not being larger in area than the insulating layer. The larger of the plates is adapted to be adhered to the backside of a mirror glass for defogging and demisting the mirror.