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Navien NHB-150 Filter

Bill Julian
Bill Julian Member Posts: 162
My supplier suggests this boiler because I have 6 cast iron radiators and suggests a use a Naviclean filter NAVGXXX001727. Anyone know anything about this? And how much maintenance is involved? Thanks


  • motoguy128
    motoguy128 Member Posts: 393
    A good dirt and air separator would be fine.  Install the factory manifold and it has purge valves that you can use to back flush the heat exchanger.  I dot see how tiny iron oxide particles will be any issue.  They will pass right through. It’s all the bigger bits that the dirt separator needs to stop.  

    Are 6 cast iron radiators all you have?    That’s a big boiler.  

    Also, remember that unless you use polypropylene or similar exhaust you are limited to 147f return water temp.  So only 160-170f supply temps depending on flow rates.   If you need 180 for low mass baseboard, you can’t use PVC.