Operating washing machines, stereos, and other appliances with self-generated power is no longer a rarity today. In the future solar energy will also provide pleasant heat in buildings and flats. This is possible among other things thanks to the aelecra heating system developed by the start-up Deutsche Energiesysteme. The electrically operated film made of carbon-plastic composite can be installed on the ceiling, wall, or floor and under any material. Thus the heater disappears under floors and rugs, and pipes and radiators are no longer needed. A technology that opens the door to sustainable heating.