I believe I have heard often that coal does not produce as hot a temperature going out the flue as wood. Specifically when they are referring to danger of chimney fires. True coal will not produce the creosote buildup in a chimney that wood will however... At one time the temperature of the air above the fire in the firebox with my old coal furnace was measured. It was over 1700 degrees. I am aware that there are many ways of "over firing" your furnace / stove but does wood produce a temperature even close to that? In a stove of course, not talking wildfire here. In an overburn situation it has already completely melted off the end of my poker. Also melted off the baffle plate. I learned a valuable lesson not to let the uneducated tend the coal furnace. "Children shouldn't play with matches" Anyone have the max temperatures of the different fuels as far as the exhaust of combustion gases is concerned.