navien 210a a-series tankless recirculation

  1. Jon Austin

    Navien - hot water coming out the cold inlet

    I have a Navien NR-210A - about ten years old and recently, in external circulation mode, its sending hot water out of the cold inlet when it recirculates. There is a dedicated recirculation line and external circulation has worked well for for those ten years until now. There are no issues with...
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