Mr Heater, Big Buddy MH18B The Most popular portable propane heater in North America. This patented radiant 4,000-18,000 BTU liquid propane heater connects directly to two 1 lb. cylinders and is the perfect solution for heating enclosed spaces like cabins up to 450 sq. ft. 4,000, 9,000, or 18,000 BTU per hour 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 Learn More