franco b wrote:lobsterman wrote:It is totally agreed that the DS machine is a more powerful heater than the Chubby. No comparison, no argument. My point is the higher heat output can only come from burning more coal per hour.
As the heat output goes up the DS Machine stove will do it more efficiently. Even at a rate of 40 pounds per day it will put out more heat than the Chubby because of its greater heat exchange surface and hopper feed. You are assuming equal efficiency which the smaller stove just can't do except at very low firing rates. To reach 60 or 70k BTU output the Chubby would have to burn well over 100 pounds per day. The sides would be glowing red and the stack temperatures would be out of sight.
Respectfully disagree, the Chubby will run at the 40lbs per day rate at 90% efficiency and NO stove will beat that. At higher burn rates, I agree with you and the reason has nothing to do with the hopper but rather the increased convective cooling due to the large size. The Chubby blower with its forced convection will do even better for higher burn rates.