Pricing mentioned is for EA. Requires a minimum buy of 1 piece. Output Power=4000 Btu/h [Max], 9000 Btu/h [Max], 18000 Btu/h [Max]; Working Area=400 sq. feet. [Max]; Fuel Type=Propane; Usage=(1) 1 lb. Cylinder: 1.5 to 6 hrs, (2) 1 lb. Cylinders: 3 to 12 hrs, (2) 20.1 . Cylinders: 50 to 220 hrs; Voltage=6 V, 6 V [Max]; Height=17 1/2 in; Width=10 in; Length=17 in