navien dhw

  1. binman

    Navien NCB 240/110H Not Heating DHW to Temp & Slow to Get Hot Water

    Hi all, as the title suggests I recently had a NCB 240/110H installed with an external Grundfos Comfort PM circulator pump (circled in image). When we first installed it, the hot water seemed instant and HOT. DHW temp set at 130F. Scalding within 10-15 seconds at every tap in the house. Then...
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