Dayton Hot Surface Igniter: 5VD67 to 5VD80, AKA-7D837 to 7D851 (All Models)

These heaters use infrared energy to heat spaces. When heat is required, the burner control box ignites a gas/air mixture and pushes the hot gases into the radiant tube. As the gases pass through the assembly, the tubing is heated and emits infrared, which is then directed toward the floor by reflectors. This is known as primary infrared and is absorbed by the floor, objects and people in the space, raising their temperatures.