Mr. Heater MH18B Portable "Buddy" Heater 4, 000-18, 000 BTU/HR.

Features Cylinder not included 4, 000, 9, 000, and 18, 000 BTU/hr Automatic low-oxygen shutoff system Accidental tip-over safety shutoff Heats up to 400 sq ft Connects directly to two, 1-lb disposable cylinders or a 20-lb cylinder with an optional hose CSA certified Not designed for permanent installation or for use above an altitude of 7, 000 ft