This patented Mr. Heater(R) 4, 000-18, 000 BTU liquid propane radiant heater is the perfect solution for heating enclosed spaces up to 450 sq. ft. Blends radiant and convection style heat for maximum efficiency. Two swivel regulators give you the ability to switch between disposable cylinders and a remote gas supply with the purchase of a single hose and filter (not included). To light the unit, push and rotate the knob and the built-in piezo sparking mechanism will take care of the rest. Portable and compact (18.5 x 18 x 11.4", 2.8 lbs). | Mr. Heater Big Buddy Portable Heater F274805