"This HeatStar Propane Heater provides efficient, cost-effective heat for loading docks, warehouses, factories, pole barns and more. BTU Output 40,000, Blower Included No, Gas Inlet in. 1/2, Dimensions L x W x H in. 30 1/4 x 19 1/4 x 12, Clearance from Corner in. 30, Heating Capability sq. ft. 750, Blower Power Supply Volts, Amps 110V, Product Type Radiant heat, Thermostat Included No, Oxygen Depletion Sensor No, Needs Direct Venting No, Clearance from Rear Wall in. 30, Clearance from Side Wall in. 30, Igniter Yes. No direct venting required Durable construction Quiet, clean heat Maintenance-free design Includes extra orifice for increasing BTU output Requires 24 Volt thermostat to operate Item# 16342 sold separately"