bob day wrote:The other thing that occurred to me concerned your seal of the front door. If your house is pretty air tight you may be creating a partial vacuum inside pulling back on the draft.
This is a very important and often overlooked point. Any building that has an exhausting appliance works on a vacuum system. There are some locations that require
constant building vacuum systems for things like radon. Your mass heater has to pull against that draw to perform. Your building may have several air drawing items working at once. Consider if you have things like a gas hot water tank, gas furnace, dryer running, attic fan running, stove hood, bathroom fan or another wood stove or fireplace. All of these things will draw air out of a building and for every cubic foot of air that goes out the chimney, a cubic foot is drawn in to the building from somewhere. Your heater WILL have to deal with this.