I've never really thought about this before, but is it preferred to draw water to the solar heater through the main drain or the skimmer? It seems that the warmer water would be near the surface, so heat transfer would be better to the cooler water from the pool bottom.
I don't know if this oversimplifies the problem, but I was just curious.
I don't know if this oversimplifies the problem, but I was just curious.