I've been visiting the site for a few weeks, but just decided to register. I have a 24' round above ground pool. I bought a house that already had the pool, so it has been a learning experience. After a couple years of learning how to maintain it properly, I finally decided to build a deck for it this spring. Now that I have a nice deck to use the pool, it has been too cold to actually use it over last two weeks and the next week isn't looking good. So now I'm seriously looking into solar heat. I have a nice area just north of the pool that would fit multiple 20' panels, and gets sun for at least 10 hours a day. So I'm currently trying to research designs and products that other people on the site have used.