"This HeatStar Propane Heater provides efficient, cost-effective heat for loading docks, warehouses, factories, pole barns and more. BTU Output 40,000, Thermostat Included No, Blower Power Supply Volts, Amps 110V, Clearance from Corner in. 30, Heating Capability sq. ft. 750, Oxygen Depletion Sensor No, Clearance from Rear Wall in. 30, Clearance from Side Wall in. 30, Needs Direct Venting No, Dimensions L x W x H in. 30 1/4 x 19 1/4 x 12, Product Type Radiant heat, Blower Included No, Gas Inlet in. 1/2, 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"