Radiant heaters - whether infrared or dark radiant heaters - should be installed at a minimum distance of 60 cm from the bedding and surrounding walls. In small coops, radiant heaters can quickly lead to overheating. A well-ventilated barn is healthier for chickens than an overheated barn. Damp, warm air often leads to respiratory problems. approx. 5000 operating hours at 240 V