On Thu, 3 May 2012 05:47:54 -0700 (PDT), "
wrote:

On May 3, 8:26Â*am, Larry Fishel wrote:
I have no info for you, but I can guess that the first two questions
you're going to get here a
What kind of heating do you have now?
What sort of chimney do you have?

+1 to that.

But in general it sounds like BS to me. Any heating
system you buy today is going to be a lot more
efficient than the one it replaces. And that should
mean cooler exhaust temps, not higher ones.
With a high efficiency condensing system, the
exhaust gases are so cool that 1 1/2" or 3" PVC
pipe is used to vent the unit directly outside
without a chimney.

Now it's entirely possible that he could have a
crap chimney that is in such a sorry state that
it won't pass inspection. That would prevent
any new unit, oil or gas from being installed.
Unless it didn't need the chimney, as stated above.