Dura Heat double tank portable 360 degree indoor/outdoor propane heater. With the durable styling, the heater is a great choice for heat in outdoor and emergency indoor situations. It utilizes two disposable 1 Lb. propane cylinders making it completely portable. When outdoors, you have the extra option of hooking up to a 20 Lb. refillable tank with the optional extension hose (not included). The convenient carrying handle allows for easily moving the heater to any location. Two heat settings provide up to 18,000 BTUs per hour. Other features include a swivel valve for easy tank loading, safety tip-over shut-off, built-in oxygen depletion sensor, protective grill guard, and single one-button lighting/heat control.