Can be left unattended without threat of poisoning from combustion by-products associated with fuel-fired heaters Heavy-duty spiral fin tube metal sheath elements for uniform heat output Control comfort with built-in thermostat and safety thermal cutout Fan-only mode for air recirculation, fume exhaust or fresh air supply Single- and three-phase operation 10- in. pneumatic wheels Thermostat selector switch Optional ceiling/wall bracket available Cord sets for power supply feed available