Mr. Heater Big Buddy Heater: * 4,000, 9,000 and 18,000 BTU/hr * 3 temperature settings: Hi, Med and Low * Swivel regulators for easy installation of 1 lb propane cylinders * Quick connect assembly for hose assembly * Automatic low oxygen shutoff system * Accidental tip-over shutoff * Heats up to approximately 400 sq ft * Connect directly to two 1 lb disposable propane cylinders or to a 20 lb cylinder with optional hose and filter * CSA certified * Uses include: * Cabins * RVs * Workshops * Patios/porches * Picnic areas * Tailgate * Emergency heat * Not for sale in CA or MA