I am trying something different this winter. I am going to cut my larger diameter logs into short rounds, something like 12" long, instead of splitting wood. I am running a Central 6048 boiler, 500,000 btu. Heating 2400 sq, feet of house, and a big shop. It doesn't "idle" very much. I will post my results. I do have smaller logs to mix in, so the rounds won't be stacking like coins in the boiler.