The AquaQuick SolarPRO XD2 is the perfect solution for adding solar-powered heat to your above ground or smaller in ground pool and generates 3 times more heat than the XD1. Its compact size allows you to place it anywhere there is full sun and it easily attaches to any existing pump & filter system including Intex! The heater coil is made from super strong high density polyethylene and engineered to last, having been put through rigorous testing under high pressure and heavy chemical loads. There is no gas or electric to run, you can do it yourself and even link multiple units together to gain even more heat and heat larger pools. Open earlier, stay warmer, enjoy your pool more, and close later - all with this economical product.