Efficient and environmentally friendly today Around 1800, the German-British astronomer Friedrich Wilhelm Herschel wanted to find out in which color range the sunlight is warmest. He found that the temperature was at its highest, where he saw nothing. Right next to the red area. Thus, FW Herschel discovered the infrared radiation. The sun is the most natural heating of the earth. A beautiful autumn day, the air a bit cool. The sun is shining from the sky. Let us turn to her, flows through us despite cool temperature, a comfortable feel-good heat. The heat rays of the sun penetrate the air without warming you and release your energy - the heat - only when they hit surfaces such as streets, buildings, meadows, animals, etc. The DIGEL-HEAT infrared heaters are just that! Where the infrared rays strike, they are converted into heat. As on our skin and body, on objects such as couch table cabinet. Floors walls and ceiling. This is how heat gets directly to where we need it. These surfaces / surfaces absorb the heat energy and give it back to the environment. Thus, the air in the room is also indirectly heated. This creates a balanced indoor climate of air and heat radiation. The sun shows us just that, every day.