Cold campsites and frozen lakes call for the warmth of a Big Buddy heater. For your next excursion, the Big Buddy will keep you comfortable with up to 18,000 BTU of heat. Swivel regulators make for easy setup; just screw on two 1-lb propane cylinders or connect to a 20-lb tank using Buddy accessories. The 450 square feet of coverage makes any ice shanty a sauna and any deck a sunroom. With the heaters�� registered Life Safety System you won��t sweat too much knowing the oxygen depletion sensor, thermal shut-down system, and tip-over switch are keeping you safe. For all of your indoor and outdoor adventures, the Big Buddy is there for you. 4,000, 9,000, or 18,000 BTU per hour Propane heater for use with propane gas Heats up to 450 sq. ft. Single control start knob Hi-Med-Low heat settings Swivel regulators Automatic low oxygen shut-off system (ODS) Accidental tip-over safety shut-off Connects to two 1 lb. cylinders Connects to a 20 lb. cylinder with optional hose Specification:nbsp; Heating Area (Sq Ft): 450 Tank Capacity (Min): 2 x 1# Propane Cylinder Weight: 17.1 Model: MH18B Length: 19.00 Width: 12.00 Thermostat: No Safety Tip-Over Switch: Yes Fuel Type: Propane Heat Type: Radiant Oxygen Depletion Sensor (ODS): Yes Indoor Safe: No