Is there a baffle in the old insert?
The 2100 will burn efficiently with a smaller load as long as the fire chamber gets hot enough for good secondary combustion. 5 or 6, medium-sized splits will be enough to get the firebox and flue up to operating temperature as long as the wood is well-seasoned. Then, if only a little heat is needed, let the fire burn out instead of adding more wood. Or, just add 1 or 2 additional splits to keep producing low heat.
I wouldn't obsess too much about this. No matter what, either stove will be significantly more efficient than the old smoke dragon.
The 2100 will burn efficiently with a smaller load as long as the fire chamber gets hot enough for good secondary combustion. 5 or 6, medium-sized splits will be enough to get the firebox and flue up to operating temperature as long as the wood is well-seasoned. Then, if only a little heat is needed, let the fire burn out instead of adding more wood. Or, just add 1 or 2 additional splits to keep producing low heat.
I wouldn't obsess too much about this. No matter what, either stove will be significantly more efficient than the old smoke dragon.
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