Mr. Heater MH18B Portable Propane Heater, Red 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 up to 450 Sq. Ft. Two swivel regulators give you the ability to adapt usage from disposable cylinders to a remote gas supply with the purchase of a single hose and filter. To light the unit, simply push and rotate the knob. The built in Piezo sparking mechanism will take care of the rest. With the oxygen depletion sensor (ODS) and accidental tip-over safety shut-off, you can be sure that you will enjoy years of comfortable outdoor safe heat. Features 4, 000, 9, 000, or 18, 000 BTU per hour Heats up to 450 sq. ft. Hi-Med-Low heat settings Automatic low oxygen shut-off system (ODS) and accidental tip-over safety shut-off THE USE OF UN-AUTHORIZED ACCESSORIES/ATTACHMENTS WITH THIS HEATER ARE EXPRESSLY PROHIBITED, MAY CAUSE SERIOUS INJURY, AND WILL VOID THE . USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.