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Gas and Oil Flue Piping

herbydog Member Posts: 1
Hi Guys,Just wondering what the code is on installing a new gas boiler in lieu of a oil boiler,with an existing oil boiler in the same chimney.There is currently a old flue liner in a brick chimney.Should i install a stainless liner and connect them together in a common flue.Regards


  • Lance
    Lance Member Posts: 241
    Chimney concerns

    Your information is lacking specifics. You must check vent compatability.

    It is recommended that all components meet or exceed current codes.

    Assuming both appliance vent connectors can use a common chimney, "they both use a natural draft flue", it is advisable to have the gas enter above the oil connection to the chimney breaching.Your oil vent connector should have a barometric draft diverter. Your gas unit a draft diverter.

    The code involved should be NFPA 54 with any changes adopted by your local authorities. Each appliance installation instructions must be followed.

    Your best first step is with the manufactueres instructions. They also can provide apllication support.

    Good Luck, Lance
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