Eco Saver Solar Pool Heaters you can warm your pool up 10 to 15 deg without additional electricity, Propane or Gas. Eco Saver Solar Panels are 20% larger than other panels which means more heater for your pool. More heat can extend the swimming season which means more fun and relaxation for you and your family. The Eco Saver Solar Panels works using most existing pump and filter systems. Water circulates from your pool into your pump and filter and then circulates through your Eco Saver Solar Panels and back into your swimming pool