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Extending vent pipe into water tank in attic

  • 11-07-2023 9:37pm
    Registered Users Posts: 75 ✭✭


    I have an open vented system with a vent pipe thats fixed about 8 inches or so above the top of the water tank in the attic. I understand this pipe allows steam and water to be safely vented away from the boiler in case of an overheat emergency but I want to put a lid on the tank. I can cut a hole in the lid and extend the vent pipe into the tank but my question is does it matter what kind of pipe you use for this extension? Will some soft plastic hose type pipe clamped on suffice or does the temperature of the water coming from the boiler mean you need to use some kind of harder plastic like PEX?


  • Registered Users Posts: 6,955 ✭✭✭10-10-20

    I don't think it's specified for that last short run of the pipe. It would make most sense if you matched it. I would not use general-use plastic, I would recommend some pex pipe for sure.