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Chimney liner questions

bmac_to
bmac_to Member Posts: 2
in THE MAIN WALL
Hello,



Three years ago I replaced a 80 year old oil boiler with a Viessmann

Vitola NG boiler (with a lot of advice from this website).  Everything

concerning the boiler has been great.  However, the chimney cap

(sometimes called crown) is starting to disintegrate. 







Some background info - the chimney is about 10 years old so having the

cap disintegrate is premature.  The cap is a precast concrete type. 

The current chimney liner is a stainless steel liner that was left over

from the oil boiler - it was quite new and the contractor who installed

the boiler did not feel it was necessary to change it.







I think there are one of two possibilities for this premature failure -

the cap was installed incorrectly (wrong mortar, etc), or it is

directly related to the new boiler.  Due to the lower exhaust

temperatures of the new boiler, perhaps condensation could be causing

this problem?







What is everyone's opinion?  If it is condensation, whould replacing

the liner help?  If so, what type would you recommend?  Aluminum? 

Insulated stainless?  Other? 







Thanks.

















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