Well gang, I think I mentioned getting the Testo flue gas analyzer. I finally got around to doing a full test run a week or so ago, then procrastinated making the video. Partly because it's not the best run, but, after thinking about it a bit, I think that's great. This shows pretty normal use, not an ideal situation. One thing that would make the efficiency go up is cooler stack temps. I could fake it and do a test run after letting the heater cool for 24 hours or so, but that's not how I actually use it. I also loaded it with fuel that was cut a bit small, and that spikes the CO in the beginning of the burn. Again, I could have tuned the load for a test, but I think it's great that it shows the quirks. As for the heater itself, I'm inspired by the tester to try to keep more heat in the house, stack temps are surprisingly high after going through all that mass. There may be another bench extension in my future this summer. Maybe. Anyway, it's kinda boring, but maybe someone will find this useful.