Boarding -Heating cable in twin-shape, front and return conductor generates heat. By heating in both directions, the specific watt supply of heat-conductor distributes per meter on both heat-conductors, i.e. max. heat distribution and longer life-span, which can be claimed just by half of the capacity respectively. This heating cable is suitable for types of heating compatible flooring, provided in any perceived room space. The spacing of heating cable ascertains the heating lines pro m², as well as the abashed surfaces. The heating cable with 20 W/m suits for rooms with increased demand for heating, e.g. winter garden, basements, entrance area and covered outdoors. Corresponding to DIN EN 60335-1, DIN EN 60335-2-96 und DIN EN 50366.