The present invention relates generally to improvements in electrical heating units, and more particularly to improvements in electrical heating units of the type employing wafer-like material or sheets such as mica having an electrical heating coil associated therewith. The embodiment of the invention disclosed herein includes thin coplanar sheets of heat resistant, electrically non-conductive material such as mica, the outer peripheries of which in the aggregate generally define a circle. Diametral margins of said sheets are adjacently spaced and an electrical heating coil adjacently encircles said sheets. A terminal member is connected with each extremity of the coil, and suitable electrical insulating material adjacently superimposes opposite sides of the sheets. Means is provided for maintaining the sheets and insulating material in juxtaposition.
