First of all preference Mr. Heater HeatStar Radiant Tube Heater - 45,000 BTU, Natural Gas, Model# 208850 critiques

Low intensity infrared radiant heat is the most effective and efficient way to add comfort for 2- and 3-car garages, workshops, decks, patios, entryways, greenhouses, farm buildings, ski lodges, bus shelters and more. 3in. aluminized steel U-tube design provides uniform heat distribution. Product Type: Radiant heat, Thermostat Included: No, Blower Included: No, Blower Power Supply (Volts, Amps) : 120, Fuel Type: Natural gas, Dimensions L x W x H (in.) : 128 1/4 x 20 x 12 1/2, Vent-Free: No, Remote Included: No, BTU Output: 45,000, Oxygen Depletion Sensor: No. Radiant tube heater 3in. aluminized steel U-tube design Polished aluminum deep-dish reflector Commercial and residential approved CSA certified for indoor and outdoor applications Installs easily allowing for horizontal or angle mounting and vertical or horizontal venting (vent kit sold separately Item# 173640) Thermostat sold separately Item# 173649 Shipped in 2 cartons.