Smartpool S601P SunHeater Solar Heating System for In Ground Pool Keep your pool warm with a polypropylene heat collector. Direct Flow System - One Header Hole for Each Heating Tube Solar heater features 80 square feet of solar panels Pool accessory is perfect for heating any in-ground swimming pool Panel array measures 4 feet wide x 20 feet long. Raises Pool Water Temperature 6-10F (4-6C) Installation kit required (Sold Separately)