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Stainless Steel vs Cast-In-Place liner for Gas Exhaust

John_98 Member Posts: 1
Hi, about to sign a P&S for 17th century house in Mass. Home inspection & chimney inspection found that living room fireplace sharing flue with the 14 year old gas heating system's exhaust. Learning that this is a no no.

Wythe walls in chimney are deteriorating and mortar is falling apart. Therefore, have to line the chimney and 5 flues. Can I use stainless steel liner for gas exhaust? Can I use Cast in place for exhaust? Also looking into direct vent but because stone foundation is 300+ years old and next house is 4 feet away, could be a problem. Other alternative is new Weil-McLain or Munchkin efficiency gas boiler. Any answers or suggestions greatly appreciated so I can purchase a money pit.
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