Oxygen depletion sensor (ODS) built-in.. NOTE: The state of California prohibits the use of this product. Due to the built-in oxygen safety sensor vent free products may not work properly at elevations of 4500 ft. Increased BTU output; No electricity required.
Adjustable heat settings; Manual control features. Optional floor stand (20-5345); Optional blower (20-6127). Heating coverage:- 1250 square feet.