low gmp

  1. J

    Grundfos Alpha 15-55f stuck in 1 GPM

    I have a Navien NCB-240E combi located on the third floor supplying DHW to the house and infloor hydronic to the first floor. It feeds a 3-loop Wirsbo manifold on the first floor (two loops on one thermostat and one on another). A Grundfos Alpha 15-55F (maybe 5-6 years old) is on the return...
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