Heats areas classified as hazardous locations designated as Class I, Group C & D Division 1 & 2 or Class II, Groups E, F, and G with a T3B ignition temperature code rating (329°F, 165°C) or higher to provide primary or supplementary heating for comfort or freeze protection. Pre-wired, self-contained control center. Standard controls include automatic reset thermal limit, magnetic contactor, and 24V control circuit transformer.