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We have an old 1920's house with a central brick chimney. We replaced the boiler 10 yes ago with a peerless series MI 05 stdg wpc gas natural draft boiler. There is also a 40 gallon gas hot water heater venting into the chimney. We have had condensation issues with bleeding of dark sticky liquid thru the chimney mortar at its upper 8 feet on the coldest winter days. We have reroofed and reflashed, and put a 6" stainless liner into the chimney connected to both boiler and hot water heater. There is still condensing on the coldest days. We have also waterproofed the exterior part of the chimney and have been told the mortar and bricks are fine. There is a rain cap on the stainless steel flue and also, an old clay flue JUST at the top several feet. The clay flue protrudes about 5 inches above the brick and the stainless steel liner is about 10" above the clay flue. There are no icicles on its exterior. My contractor thinks its possible the clay flue might be causing the issue? Anything we should look for? Help needed....