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Type IV Boiler vent

newinnj Member Posts: 36
edited November 2019 in Radiant Heating

I have a Navien NB-150 condensing boiler. The boiler vent collars have a tiny gap between the collar and the boiler. First should this be sealed? I am thinking yes. If so, any recommended material to seal the gap. Thanks in advance.


    JUGHNE Member Posts: 9,759
    Open it up and look inside. Are there solid pipes passing thru the collars? The gas may be only on the flange and not the actual pipe itself.
  • newinnj
    newinnj Member Posts: 36
    You are correct and thanks! Pipes inside the boiler goes up and past the collars into the external pipes.