Abstract: The heating plate (1) has cavities (2), in which electrically heatable heating bodies (3) are disposed. A heat exchange medium circulated by a pump (4) transmits the heat emitted by the heating bodies (3). The heating plate is designed to obtain a uniform temperature distribution using as low a volume of heat exchange medium as possible. To this end, the cavities (2) are elongate and the heating bodies (3) are bar-shaped.

Abstract: Adjacent rows of flat, panel-shaped components disposed below one another, overlapping in a shingle-like way, form a covering of a roof or a facade. The components are preferably designed as photovoltaic elements. Disposed under the components in each case in the region between adjacently situated vertical rows is a section forming an upwardly open channel in order to receive and drain water running off next to the components. The section has sawtooth-shaped lateral parts on which the components are borne in their shingle-like configuration. By means of the lateral parts, a clearly defined support for the components is formed, and by means of the sections draining the water, seals between the components can be dispensed with even in horizontal direction.