About what I was guessing when I read that - face cords, so it translates to more like 15-20 real cords, of which at least five is totally wasted by sending it up the stack of an OWB. Glad I don't live downwind. (a gasifier boiler like a Tarm or an EKO will typically burn 30% less wood than a "highly efficient" design OWB that is properly operated...)
Gooserider
Well, this thread was about firewood chainsaws but, since you brought it up, what does one of those gasifiers typically cost? I've owned an OWB for 20 years (still working fine and paid for itself many times over) and want to figure out how long it will take to get get a return on the investment.