Originally Posted By: mpfeffer This post was automatically imported from our archived forum.
I just read a couple threads mentioning similar situations, but I’m not 100% sure about this yet: I looked at a home with an old masonry chimney. In the basement, the water heater and furnace Y’d together, then went up into the masonry chimney. I didn’t see a liner from the roof. Is this OK? Is there a regulation on this? I too see a common b vent around here 95% of the time for water htr/furnaces to vent up through the roof. Would the above situation be OK with a liner installed? the way it is? Or not at all? Thanks in advance…
Originally Posted By: jsavino This post was automatically imported from our archived forum.
Matt
I'm assuming the fuel being used is gas. If the heating system was converted from oil to gas, part of the install would be a chimney liner.(stainless steel)
They did this because of the stack temp. Lower stack (exhaust ) temp will cause condensation, and cause the inside of a stone or masonry chimney to deteriorate faster. Being Y'd together is fine. Its not necessary to have a stainless lined chimney. Recommend to your client to have the chimney inspected by a certified chimney sweep co. There is an organization and a type of inspection but I can't recall the name at this time.
Hope that helped.
John
Originally Posted By: dvalley This post was automatically imported from our archived forum.
Mike,
High efficiency furnaces and water heaters are always appropriately vented or power vented through the side of the house. If you have a high efficiency furnace venting into an unlined chimney, you have a poor vent installation of a high efficiency heating appliance.
Originally Posted By: jsavino This post was automatically imported from our archived forum.
David
That is not necessarily so. If a chimney is pulling .04 to .06 inches of water column draft, there's nothing wrong with that chimney and it's venting properly. Liners are installed to stop the wash-down from condensation, especially from old terra cotta lined chimneys.
Case in point; my heating system is high efficiency and the house was built in 1947. My chimney is terra cotta lined and still has .05 inches draft with 85% efficiency and stack temperature of 350 degrees.
Originally Posted By: mpfeffer This post was automatically imported from our archived forum.
thanks for all the replies. This is an old oil burner. the water htr is at the lower end of the efficiency chart, about 2 years old. The vent did not go all the way up. Just stubbed in i’m sure. He did deal it well though. Thanks again guys.
