JW, Sorry I didn't get right back to you. I usually don't read the heat section since I am planning on building a wind turbine.
Since they are my Dad's customers it would be best for me to put you in touch with him and he can point you in the right direction. He is unavailable untill april 5th but you can contact him from his website, http://wooddoctorofvt.com or e-mail him at
warmhome (at) sover.net
The photo on the front page is an older one but the wood doctor converter (on the left) still looks the same except it now has a roof like the furnace on the right. You can also find more information about the converter at http://wooddoctorfurnace.com/converter.html
I hope this answers your questions but if not I will keep an eye on this thread.