Upgrade your pool time with the SunHeater S601 Two - 2 x 20 Solar Heating Panel system. It s an eco-friendly cost-effective way to warm the water. Capture free heat from the sun s rays to raise the temperature by up to 15 degrees F. This simple device can add weeks to your pool season and reduce your heating bill. The Sunheater S220OIG is the only solar pool heating system designed specifically for inground pools and offers a generous 80 sq ft surface area that is easy to install on most rooftops a rack a fence or even on the ground.