Thanks for the comments. We burn red fir, white fir, pine and tamarack. No oak. The T6 doesn't have any issues keeping my house warm, it's a great stove. Sounds like Id probably go through the same amount of wood with a BK the heat would just be distributed differently. I watched a video on you tube for a BK demo and the guy put his hand through the cut away of a flew after shutting the bypass. Are the flue temps really that low or was it was it a joke?