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Condensing gas combi boiler Common vented

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bob eck
bob eck Member Posts: 930
in THE MAIN WALL
Are there any condensing gas combi boilers wall hung that can be common vented together?

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  • JakeCK
    JakeCK Member Posts: 1,356
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    No.
  • Noel
    Noel Member Posts: 177
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    In larger sizes, this is available. https://www.bosch-climate.us/files/201309192156100.6720646836_GB162_Flue_Cascade_Kit_Installation_Instructions_en-fr_08.2013.pdf
  • JakeCK
    JakeCK Member Posts: 1,356
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    I stand corrected.

    I like the first thing listed on the second page:
    " To be installed by a heating engineer only." I wonder why.
  • Henry
    Henry Member Posts: 998
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    In our gas code, only the same make, model and capacity, plus each unit must have a factory installed backdraft prevention device can be combined vented.
    Most NA manufacturers have followed our recommendations.
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    The scary thing with positive pressures common venting is that is a unit (which is off) has a poor seal on the backdraft damper then combustion gasses reverse flow through the appliance. No good will come of that.
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
    CanuckerBob Harper
  • GroundUp
    GroundUp Member Posts: 1,907
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    I'm not a Navien guy so I can't say for sure, but I have seen a whole lot of Navien units piped to a common vent when cascaded.

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