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Pretty sure I would need to use the circulating pump since I am pumping cool water up and hot water down. It would need a shutoff valve for the evening as it would then go into a self flowing mode as it attempted to vent the heat into the cooler night air.
It would be easy enough to automate. Just install a 110 volt solenoid valve controlled by a 24 hr timer.
Won't happen this summer as I already have enough projects. Maybe next year.
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