navien 150

  1. James Cao

    Navien NHB Condensing Boiler and Nest Thermostat

    Hi All - new to the forum and would appreciate some expert guidance I would like to install a Nest to control the boiler. the old thermostat used 2 wire (R & W), which are connected to CN10 on the NHB board. I have added a blue and green wire to provide power to the thermostat but don't know...
    • James Cao
    • Thread
    • blue wire common to the c terminal common wire green wire navien 150 nest thermostat
    • Replies: 3
    • Forum: HVAC Heating & Cooling
  2. Leonard Bayard

    Short acid neutralizer life

    I have a Navien NHB-150 boiler and have been going through neutralizer at a fairly fast clip. My plumber installed a Saniflo sanicondens and it used up the round granules in about two weeks. I switched the granules to the Rinnai rocks (about 2lbs) and that only lasted just over a month. The ph...
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