We are all concerned about our environment. With Infratech heaters, you can entertain outside without producing negative environmental effects. Efficient Infratech electric heaters convert over 90 percent of input energy directly into infrared radiant heat, and they operate for just pennies per hour. Electric heaters are safe for use outdoors or indoors, operate silently, emit no greenhouse gases or unpleasant odors, and do not require ventilation. Infratech Comfort heater components and packaging are also completely recyclable. Contact: www.infratech-usa.com.