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Posted by HeatPro on January 10, 2005 at 09:27:09:
In Reply to: New Boiler Choice posted by Jeffrey on January 10, 2005 at 08:58:47:
If you indeed don't have a liner, then you don't want a new boiler in there at all. The instructions that come with it say to use it in a lined chimney according to the NFPA guidelines.
Now if you mean that your chimney was built with a terra-cotta inner liner as chimneys had to be built for the past 50 years, then the important point is that you would do better to add another stainless liner to the chimney inside that to make it the right internal cross-section to give the best draft to the chimney and to prevent condensation. As just about every oil boiler made can achieve 85% or better AFUE, a new boiler is close to the line of making water run down the inside to corrode mortar if you don't take care.
It is best to pick an installer that understands this, as he is more likely closer to understanding what needs to be done.