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    Poor water flow but pump and 3-way seem fine

    How much force should the impeller have? Does my system use only this pump? After reading a substantial number of articles, the story is as follows: System: Grundfos 10-50 pump drawing water from Netaheat 10/16 boiler, 1988. 3-way valve afterward feed heating coil and CH circuit. Microbore...
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