Hi all, I have 6 large Heliocol solar panels on my 2nd story roof and I haven't been blown away by the heat output of them. The 2nd story roof slope that they're installed on faces south so they get tons of sun exposure. I was looking at pictures of my pool build yesterday and traced the plumbing route from the pump to the panels and it looks like my case, water is pumped to the top of the panels then drains down through them and the pool return is the bottom of the panels. This is opposite from what I see at the Heliocol website... they show them filling from the bottom and the hot water exiting at the top. I would think that method would always ensure all the air gets purged from the panels. Does anybody know if this is really important or not? Thanks!