Mr. Heater 18,000 BTU Vent Free Propane Indoor Outdoor Space Heater (2-Pack) 2 x MH-F299820 - The Home Depot
Amazon.com: Portable LP Gas Heater, Indoor Propane Heater with Handle, Heating Area Up To 20 ㎡, Hypoxia Protection Design and 99% Combustion Efficiency, For Outdoor, Garage, Cabin, Cooking, Heating : Everything Else
Mr Heater 20000 BTU Vent Free Blue Flame Propane Gas Wall or Floor Indoor Heater - Walmart.com
Installing a propane heater - Backwoods Home Magazine