I had an interesting thing happen yesterday. I was in a hurry and reloaded my stove with whatever was on top of the wood pile instead of taking time to sort out what might be best for the moment. I threw a piece of birch, cherry and maple in there and went off the do something else. Five minutes later I came back to find almost a runaway fire. The flames were absolutely racing and the stack was approaching 800 fast. I was able to get it back under control, but wondered if mixing woods of different burning properties is a good or bad thing? Does mixing a piece that burns off quickly with one that is longer burning defeat how the stove operates in terms of one piece already being to the secondaries stage while another one is still off gassing? Sorry I am drinking wine and tend to get very analytical.