The Enersol Solar Swimming Pool Heater. When considering a heat source for your pool, you only have to look up to realize the primary benefit of solar heat – it’s free heat from the sun! With uncertainty and rising costs in the gas and power markets, the price for solar will not change. It will be free for life. Using your existing pump and filter, our easy-to-install solar pool heater ensures warmer pool temperatures, no monthly heating bills, and is proven to be the most cost effective way to heat your pool. Get the most out of your pool by extending the swimming season and have more fun–courtesy of the sun!