i vote wood dryness is on the top of my list , second let ash build up on the bottom of upper burn chamber , third small splits until you have a goo coal bed . Let me know if that helps . One other thing let one days worth of wood dry and warm up in your boiler room ,for great burns .
@SkylerB34 Your not the only one , I like when the refractory in the lower chamber turns almost clear and looks like it will melt if it gets any hotter . you need a well built boiler to handle high output clean wood gas .
Your right it is so important to keep a eye on your draft . I recommend a dedicated draft gage set up to continually watch you overall chimney draft ,to get maximum efficiency out of a wood fired boiler or furnace . My Econoburn boiler uses a barometric draft damper to prevent over draft .
@carlube79 The primary chamber will be pressurized when the boiler has a call for heat and the primary air combustion blower is spinning . The lower chamber may have a slight positive pressure at that point , depends on your barometric damper settings .Once you reached high limit or no call for heat I think you may have a slight negative pressure . The boiler is extremely air tight other wise
I know it's very important to have a chimney of adequate height otherwise you can't get the draft going enough. the last one I installed was a 40KW and had a 26' chimney, which was actually a little short of the actual recommended spec.
