I used a 4x10 panel with an Intex 15' round donut and my water temp reached 105! I had it on the ground near the pool and just routed the entire return through it. I did have to valve it down a little so the return in the pool would have enough velocity to move the water around, but it got EXTREMELY hot, and that was in north central NJ. The Intex has been retired for 4 seasons now.
I don't know if you can get it to the roof with your pump--once it's primed it shouldn't be a problem, but priming may be. Then again, it may not.
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