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Venting mod con up a (lined) chimney flue?
Just bought a house that needs a new boiler, and I was wondering.
What do I need to do in order to use a two-story masonry chimney with a
mod-con, rather than venting through the side wall?
Reason is that we are sometimes
away for a month or so during the winter, and I don't want to have to
worry about snow blocking an intake or exhaust pipe, the boiler shutting
down, and the pipes freezing.
There are two flues in the chimney, one for a rarely used fireplace,
and another for the old oil burner I need to replace. It seems to me it
ought to be possible to run a couple of stainless steel pipes through
one flue for intake and exhaust air.
But maybe I am missing something, because everyone I know with a mod con
has it vented through a side wall, and then begs their neighbors to
make sure the vents are clear when they are out of town during a snow
storm. My new neighbors might not be that nice.
Is cost the issue with venting a mod con up a lined chimney flue, or something else?