John Carroll Posted Saturday at 19:14 Posted Saturday at 19:14 Because most circ pumps are now A rated and "smart" then the pump speeds can be changed in lots of Boilers, the attached may be of some interest on the effect of changing these speeds, its based on my own (6M) circ pump but can be modified to match any pump once the full speed curve values are known. Pump Affinity Curves.xlsx
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