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Posted By: SteamyTeaIf it is pumped then just make sure that water is always pumped uphill, so pump at lowest point
Posted By: Peter_in_HungaryI would not pump it - gravity is simpler and is self regulating.
Posted By: tonyit will work well in summer but in winter only a bit.
Posted By: Ed DaviesI wonder whether making a significantly less efficient DIY panel is worthwhile.
Posted By: tonyefficiency is almost irrelevant when the heat is coming for free.
Posted By: djhOn a solar thermal circuit the pump is always on the cold side. i.e. in this case it would be pumping downhill.
Posted By: Ed DaviesI think it's just a matter of extending the life of the pump by running it cooler.
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