You want to have your draft set based on Keystoker's specs. This will run your stove most efficiently and SAFELY!! Minute changes in draft aren't going to change your burn characteristics, but it will suck more heat our of your stove thus wasting it (if the draft is too high). All your combustion air comes from your combustion blower and that is what controls your burn characteristics. If your draft is so high that it is sucking more air through your coal bed than what your fan is blowing (thus getting a hotter fire), then you are probably guaranteed a hopper fire. If you draft is too low (theoretically keeping more heat in your stove), you will risk CO leaking into your house out the stove. Neither of these circumstances are worth risking just to save a little heat.
If you want a hotter fire, open the shutter on the combustion fan more to let more air blow through coal bed. BUT, watch your manometer and make sure your draft keeps up with the increased air input. If it can't than the fire box will pressurize and leak CO out the door gaskets.
Like the previous poster mentioned, set your draft to recommended number on full burn (and low to no wind also helps). With mine properly set, my draft usually drops down to .02 (kokers are recommended at .025) during low to normal burn. I usually don't need a full grate of coal burning to maintain my house temps. So, in my case, if I was to purposely set my initial draft low to save heat, then I would probably have CO issues when my fire wasn't burning fully because my actual draft would be too low on partial burns.
Also, as per McGiever, make sure you are testing you draft ("over the fire") next to the ash pan door. A lot of stoves need their drafts checked at their exhaust tube termination, Keystoker has a hole next to the ash pan door specifically for draft measurement.
Last edited by WNYRob
on Wed Nov 13, 2013 8:51 am, edited 1 time in total.