Awesome !
I just installed 2 2' x 20' fafco sungrabber panels to warm up our 15' above ground pool.
I put them on the roof, 40' from the pool, pump pressure went up 2 psi and flow is good.
Not a whole lot of sun yesterday but pool went from 78 to 82, held at 80 this morning
and up to 82 late this afternoon after another very cloudy day with a little rain.
Im expecting these to work really well on good clear sunny days........
Panels were $200 and I spent another $200 on pipe hooking it up.

greg, I sent you a pm as I'm wondering how this system turned out.

I'm kind of leaning that way for my pool but still unsure.