This powerful above ground pool heater features revolutionary induced draft technology that ensures peak performance in all weather and wind conditions, so you always get the most heat for your energy dollar! Equipped with an electronic direct spark ignition for easy automatic control, and a simple plug-in 120V electric cord for easy installation. Recommended for use on pools less than 450 square feet. Not for installation at an elevation greater than 2,000 feet above sea-level. For residential use only.