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Embassy Onex Domestic Hot Water Exchanger

Rverone Member Posts: 8
Dear Team,

I have a 2012 Embassy Onex 160 C condensing boiler.
I'm seeing very light amount of droplets coming from the Domestic Hot Water Exchanger.
Not sure if its the exchanger leaking or the 4 gaskets that connect the valves to the exchanger.

Thank You,



  • kcopp
    kcopp Member Posts: 4,431
    Got any pix? Most likely its the gaskets.
  • Rverone
    Rverone Member Posts: 8
    Dear Kcopp,

    Hope all is well.
    I still have the Cosmogas 160c gas burner.
    What we have done recently is switched it heat only.
    I have an external hot water heater producing hot water for the house.
    So no problems with it operation all is good. My plumber checked the humming noise we were getting from it with a manometer. Got it tuned the best he could, but we still get the humming noise every time the burner ignites. Any advice would be greatly appreciated. Thank You Rob
  • kcopp
    kcopp Member Posts: 4,431
    Has the boiler been cleaned?
    They will typically start to make a moaning noise when they get dirty.
  • Rverone
    Rverone Member Posts: 8
    Hi Kcopp,

    The boiler has been completely cleaned since the last time we talked.
    That was the issue of water vapor from the unit not leaking out.
    You were spot on, water was trapped in and I sucked it out with a vacuum.
    I checked the air intake/exhaust pipe today, some rust but looks ok.
    Any Advice is Always Appreciated. Thank You, Rob

  • kcopp
    kcopp Member Posts: 4,431
    Was the incoming gas pressure checked?
    What did you end up w/ CO2 numbers when a combustion test was done?
    Typically if it moans its lean...