I was pretty sure that I posted this before but...
I was wondering if since the exhaust gases are relatively cool, if anyone has tried using a class B flue vent for a chimney. I have a Midwest ranch home and was considering a rocket mass heater in the basement. Rather than spend the $$ for insulated stainless chimney sections I was thinking of a class B flue vent instead. The chimney will have to exit the house and 90 up to penetrate the soffit so that it can draft properly.
Mike; I do not know what a class b vent is but...... You do not need any stainless stove pipe at all, the temps are so low (less than 200 degrees) that regular stove pipe is all you need, in fact you can use hvac pipe which would melt at normal wood stove exhaust temps. After start up all you will see is steam coming out of your pipe.
However, we are talking about fire within your house where you live. Implementing a good chimney system is like taking out insurance. It doesn't have to be stainless. However, even the galvanized insulated chimney pipe is expensive.
Besides protecting the combustibles around the pipe, the other purpose of the insulation is to maintain the temperature difference between the outside air and the exhaust in your pipe in order to maintain good draft.