Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater Nullify Made in US 4,000- to 9,000-BTU radiant heater for spaces up to 225 square feet. Approved for indoor/outdoor use; clean-burning; nearly 100-percent efficient When operating the heater at altitudes over 7,000 FT above sea level the heater may shut off. Auto shut-off if tipped over, if pilot light goes out, or if detects low oxygen levels. Fuel Consumption/Burn Rate (Gal/Hr) at 4000 BTU = 0.044 Gal/Hr, at 9000 BTU = 0.099 Gal/Hr Fold-down handle; swivel-out regulator; connects to propane tank (not included) THE USE OF UN-AUTHORIZED ACCESSORIES/ATTACHMENTS WITH THIS HEATER ARE EXPRESSLY PROHIBITED, MAY CAUSE SERIOUS INJURY, AND WILL VOID THE WARRANTY.