Mr. Heater Radiant Construction Heater — 35,000 BTU, Propane, Model# F270700 | Northern Tool
Amazon.com: GASLAND MHA18B Propane Heater, 18,000 BTU Warm Area up to 450 sq. ft, Portable LP Gas Heater for Garages, Workshops and Construction Sites, Ultra Quiet Propane Radiant heater with LP Regulator
Mr. Heater 35,000 BTU Portable Radiant Propane Heater at Tractor Supply Co.