I have a call into AHS but wanted to put this here for some ideas. My Wood Gun has the optional oil boiler attached to it. When first installed the oil tech said I was gettintg condensation due to the induced draft keeping the stack temps too low. Carl @ AHS told me how to defeat the induced draft fan when oil was running and this certainly did kick the the stack temps up and we mad adjustements to oil burner. This took place last year and we were well into wood burning mode so I only ran the oil for a couple of hours and at the time the condensation issue seemed to be solved. So far this year we have burned only oil due to the relatively mild outdoor temps and after a couple of days I am getting condensation again. Stack temp with the oil running is about 450 to 500 degrees. Initially I started to think that this is a design flaw but AHS states this is the first time they have come across this....any ideas?