Believe it or not...I actually understood what Daggit was saying. I wonder, though, if you plum in a series, this non-turbulent flow is non-existant as the water flows down one side of solar tubes to a 2" pipe, hangs a right, and then flows up the other side... 3 times.

Hate to ask it, but since we're all looking out our windows at feet and feet of snow and have nothing else to do but TALK about pools, which will get me the most hot water, turbulence (series) or flow rate (parallel)? Actually, I'm going to word it like this...which will make my pool warmer faster, as that is ultimately what I'm after.

Shelley