As a background, I live in the ADKS in NY in an old lathe and plaster house, of course not insulated, 1500 sq ft 2 story broken up. I had a USSC 6039 in my house that has taken on some problems and after an auger motor and new agitator and numerous other parts, I finally decided I needed something better. As a result of my budget I went with the CAB50 and can I say WOW what a difference. I have had it for about a week and notice that even around the same temps my pellet consumption has went down significantly. I want to use my OAK but am trying to find the collar for the back of the stove or a way to make one, if anyone has any suggestions let me know, I am not sure but looks like it has some kind of backplate going in the stove from the cutout look but am completely unsure.