Hi...

The oil company repair guy was here servicing our old furnace the other
day... He said that it's running at 79% efficiency (however he measured
it). That plus the exhaust pipe from the furnace has a hole about a 1/4
inch in diameter in it. Apparently the former owners had patched it
with quick-dry cement which has eventually dried up and flaked off.

How much more efficient would a new furnace be? And what's a good
material for patching a hole in stove pipe? Obviously it would have to
withstand a fair amount of heat... Probably would be best just to
replace the section but just out of curiousity...

Thanks
-mark

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