This patented radiant 4000 to 18000 BTU Liquid Propane heater connects directly to two 1 lbs. cylinders and is the perfect solution for heating enclosed spaces like cabins up to 450 square feet. An integrated fan increases the heating capacity of this uni Provides maximum heating efficiency * Heats up to 450 square feet * Heats for up to 22 hours on 2-1lb propane cylinders Big Buddy dual heating system combines radiant heat comfort with convection heat air flow The use of un-authorized accessories/attachments with this heater are expressly prohibited, may cause serious injury, and will void the warranty. * Ergonomic easy carry handle Low oxygen shutoff pilot safety system Blower fan with power on and off switch Ideal for use in cabins, shelters, patios, decks, porches, RVs, tents, tailgate parties, workshops, worksites, garages, hunting blinds, barns, sheds, truck and horse trailers, ice fishing shantys and emergency use