Condition: Open Box Note: This product has been inspected and is unused. The product packaging may be worn missing or damaged but does not affect the product. Mr. Heater's indoor safe propane Buddy heaters have become America's most popular portable heaters. The 18,000 BTU Big Buddy is the perfect solution for heating enclosed spaces like large tents up to 450 sq. ft. Its tip-over safety shut-off switch and low oxygen safety shut-off sensor will bring you peace of mind, whether at the campsite, in a workshop, job site or on a patio. Three heat settings allow for optimal comfort - 4,000 low, 9,000 medium and 18,000 on high. Big Buddy will keep you comfortable with up to 18,000 BTUs of heat. Swivel regulators make for easy setup; just screw on two 1-lb propane cylinders or connect to a 20-lb tank using the provided 5-foot propane hose. Three temperature settings–low, medium, and high–add flexibility. Features include a single control start knob with three heat settings and two swivel regulator that connect directly to 1 lb. propane cylinders. To light, simply push and rotate the knob to pilot and the piezo igniter will take care of the rest, no matches required. With quiet, efficient and odor-free operation, you’ll enjoy years of comfortable, safe indoor or outdoor heat.