I'll get some photos when I get it hooked up. Might be a few weeks until I get time though. There are several other threads on the forum concerning Magic Heat reclaimers. Most with efficient stokers claim that they aren't too useful, as stack temps are already down to 200 degrees or so. But in my case, I may benefit from it.
I measure stack temp about 18" above the outlet, just below my barometric damper. I have a hole drilled in my double-wall smoke pipe for a draft gauge insert, so I just insert a salvaged barbecue thermometer in it. The thermometer appears to be accurate at room temperature, so I'm just assuming it's accurate at higher temps too. Could be off some
Hard to stomach sending so much heat up the stack! I think I just still have too high of feed rate. Right now I have a 1-3/4" pulley on the motor, and a 7" pulley on the gearbox. In the next week, I hope to build a 1.5" pulley (can't find one off the shelf with a 5/8" arbor) and buy an 8" gearbox pulley. This should give me 75% of the current feed rate. If the Magic Heat can pull about 25% more heat out, maybe I can keep about the same BTUs using 25% less coal. I'd love to bucket 1/4 fewer buckets into the house! But then my wife would probably just turn the t-stat up.
Then next season, when I run out of Grass Creek coal (bit. coal), and switch to PRB coal (sub-bit.), I'll probably find everything changed... Right now I have a mound of pulleys laying under the gearbox, trying to get the right feedrate. They just don't make a 5/8" bore variable speed adjustable pulley that goes small enough.
I'll keep you posted.