Chimney condensation

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  #1  
Old 05-10-07, 03:31 PM
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Chimney condensation

Ever since I put in a new Trane gas heating and a/c unit I get water from the trap door of the chminey the chminey guy says it is because the new units don't send enough heat up the chminey to carry the moisture away and that i could solve the problem by using a Stainless Steel liner? Is this correct? The liner costs $850.00!
 
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Old 05-10-07, 06:43 PM
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Liner

Normally aluminum is used for gas & would be far less expensive than stainless. I have used an old chimney as a chase for b-vent depending upon the inside size of the chimney. The installation manual for the furnace should have a venting table in it which would tell you the size & material for the liner.
 
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Old 05-10-07, 11:19 PM
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My concern is do I really need to go this route? Thank you
 
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Old 05-10-07, 11:49 PM
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You do need some kind of metallic flue liner as that water will erode the mortar holding the bricks.

You wrote that you installed the furnace. Is this by any chance a 90+% AFUE furnace?
 
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Old 05-11-07, 04:09 AM
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I had a contractor do the work and I don't think it is 90% efficient maybe 80+%
 
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Old 05-11-07, 02:08 PM
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Normally a 90+% AFUE furnace has PVC exhaust piping and goes through a side wall. The 80% AFUE furnaces usually exhaust up through a chimney.

Either way, the exhaust from modern furnaces is much cooler than from the furnaces of years past. The water vapor in the exhaust WILL condense in a masonry chimney and it WILL have a deleterious effect on the inside of the chimney.

You really do need some kind of liner.

Even at $850. a liner is far cheaper than having to completely rebuild a masonry (brick) chimney.
 
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Old 05-11-07, 04:32 PM
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Thanks for asll the information.
 
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