Infrared Technology works by radiating heat to warm objects first - Similar to the sun. 6,000-30,000 BTU's/hr variable heat output for up to 1,000 sq. Variable control knob offers the most customizable heat settings LOW - 6,000 BTU MED - 18,000 BTU HI - 30,000 BTU. No electricity required allows for reliable back-up heating incase of an emergency situation.The item "30,000 BTU Natural Gas Infrared Vent Free Wall Heater" is in sale since Tuesday, October 26, 2021. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Heating & Cooling Appliances\Space Heaters". The seller is "vitviph_0" and is located in Royal Oak, Michigan. This item can be shipped to United States.