That's the energy content of red oak according to Wikipedia. Although they state that only 10.4 megajoules are recoverable if burned at 70% efficiency. I believe our stove's efficiency is about 63%.
I'm currently in the process of installing the stove pipe. This first entailed purchasing a 5" to 6" adaptor, 6" stove pipe, adjustable elbows, cathedral ceiling chimney kit, triple-wall stainless steel chimney pipe, and chimney cap. So far I've installed the adaptor, 2 elbows, and about 6' of stove pipe. Next up will be going through the roof - something I'm not looking forward to.