wrote in message
ps.com...
Check with the Burnham Tech's again, I believe they intemnd for you to
use a
double wall stainless flue pipe in the chimney opening. Insulation not
needed.

Just called them again. They expect stack temperatures of below
350F. Considering it's an exterior wall chimney and (I suggested I
may also have a fresh air duct installed in the future), they once
again recommend a stainless liner to prevent condensation from
damaging the existing chimney. As they're not in the liner industry,
they did not want to officially comment on the specific type, although
the individual I spoke with said he's familiar with the single wall
variety.

The double wall stainless liners I'm familiar with would seem like
overkill: they are insulated in between layers and are typically the
type that can be in close proximity to combustibles, like those
metalbestos things. And I do not want to switch to a power vent
situation.

Any 3-pass boiler (Buderus, Burnham MPO, etc) experts out there
familiar with or observe a similar stainless chimney liner
installation??

What does the installation manual say about it??
What do your local codes require??
What did the local building inspector say about it??
What did your insurance company say about it??

We are not here to do your homework for you.