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We have a old house and the gas hot water heater and the central heating unit is vented out an old chimney and the heater is building up condinsation, how do i vent the heating unit out the wall, unstead of the chimney.

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A CHIMNEY Liner is your best and cheapest solution to your problem,as furnaces and hot water tanks have gotten much more efficient over the years,
a lot less heat actually goes up the chimney to help remove the contaminants,up the flue ,depending on the size of your flue it may remain cold which help to create the condensation When the liner is installed it reduce the size of flue size which help to increase the temp.of the escaping air flow..the avg.cost of a decent liner installed.w/ furnace and hot water tank vented $ 350-$500 based on your area

Posted on Mar 24, 2012

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Actually if you vent your furnace by code, it would probably be cheaper to have a chimney liner installed up the old masonry chimney. you may be able to buy a kit and do this yourself. any time a new furnace with a draft inducer on it is installed, it must be vented into the proper flu material. if it was vented into your chimney, it may not have be installed by code for your area. you may talk to the instaled if they are still available and maybe that can return and do it correctly. if you leave this vented into your masonry chimney, the acid content of the exhaust will ruin the chimney. a liner will also get rid of the water problem you have.

Posted on Jan 27, 2009

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