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drem'd how exactly does your system work? I tried to find a note about it in the thread but its kind of long.
Are you pumping the water to the roof heating it and bringing it down? Whats a much better setup us filling the pipes with anti-freeze and running that pipe outside the water as it comes in.
So a wide pipe that runs anti-freeze and then your water pipe flows through that.
Technique 2 is easier, but requires a rather large tank. Run the anti-freeze pipes into something akin to the coil on the back of your fridge and pump water into the tank.
The anti-freeze has a higher heat capacity than water, a lower freezing point, and more capable of energy transfer.
Also another thing the more coolant(anti-freeze) you have in the lines the more energy is stored. If you can get a separate insulated tank for the anti-freeze(a very small tank only a few gallons) you can store that extra heat overnight. With this system the best approach is to have the pump cut off overnight and have a pressure valve that doesn't open unless the pump is going(to keep from circulating the hot anti-freeze up to your roof and convecting it away).
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