SUNHEATER Solar Pool Heating System for inground Pool 4′ X 20′ X 4 320 sq. ft. .Over-molded fiberglass crush-proof header pipes. Direct-flow system for efficient heating and winterizing. Install on ground roof or rack. Raises pool water temperature 10 degrees or more. Simple Do-It-Yourself Installation. Uses Existing Pool Pump.Tube on Web Design for maximum exposure to Sun’s rays. No fuel bills or expensive installation of equipment and connections. 5 Year Limited Warranty Mounting kits rack controllers must be ordered separately.