Abstract: A radiant heating panel is formed using a foam insulation core surrounded by a reinforcing mesh and having a pair of wiring harness fixtures snapped over each end of the reinforced core. A radiant heating wire is strung back and fourth between the fixtures to provide a radiant heating element and the core structure, including the radiant heating element, is then wrapped in a paper wrapper which is secured to the core through the reinforcing layer on the side of the core opposite the heating element. A cementicious thermal insulating layer is applied to encase the heating element and the paper wrapper is wrapped into overlying relationship with the cementicious layer to substantially completely enclose the core.

Abstract: A molded connector box for connecting electric power delivery wires to a panel (radiant heating) is formed with side walls and a bottom wall. A power wire inlet slot is formed through one side wall and an outlet slot through another side wall. Each slot has a power wire clamping fixture associated therewith. Blade type wire connectors are positioned adjacent to the inlet and outlet openings and a cooperating wire securing element is connected to its adjacent side wall via a strap in a position to be folded into the box and lock into its respective wire connector to hold the wires in the connector. A cover plate snaps into position to close the connector box.