I purchased a set of Ebay last year ( much cheaper...) I have a 21x41 with a 6' deep end. I plumbed the panel to one of the outlets with the divertor vavle... when on the water is very warm entering the pool. I only was able to use 1/2 the season but it worked very well.

mine is mounted to a framework i constructed at a 45 degree angle and against the side of my home "south facing".... gets a lot of exposure..