navien ncb-240

  1. K

    Navien NCB-240E DHW Inconsistent in Shower

    Hey all, My home has a Navien NCB-240E NG tankless water hater. After not having the system serviced or cleaned for a solid 5 years (I know -- not good), we recently had it done per recommendation of our plumber. They replaced the ignitor, cleaned the air inlet screen, replaced the filter, and...
  2. Amir Eyal

    Balancing flow through primary / secondary on Navien NCB-240

    I have a Navien NCB-240 piped Primary / Secondary. The secondary loop is feeding a couple of manifolds that split off the flow to half inch PEX-AL_PEX home runs to 12 cast iron radiators. The boiler is set to run on reset curve with max temp of 140 at 5 degrees outdoor temperature and 104 at 60...
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