Infrared panel heaters are very slim, sitting in total about 4cm deep from the wall, there are no lights or switches, no fans or noise, the panel simply becomes hot, hot enough to give off a wavelength of infrared, a warmth you can feel on your skin, a warmth which also warms objects around you like the walls , floor and furniture, these objects then also give off heat, creating a cosy atmosphere, all this warmth then heats the air, and the air stays warm for longer because it is not being chilled, and you feel cosy.