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Scottyt's right. Though John R Pollard makes some interesting observations, the total amount of heat that comes out of the stove has to equal the heat generated by the burning fuel--no more, no less, counting that which goes up the flue or is otherwise lost to outside.
What heat is radiated after the flame is out is only that which was absorbed by the stove and surrounding objects while the flame was burning. When the stove was first lit, the metal and the boat had to absorb heat before it was hot enough to radiate heat. You might say that's the heat it gives off after the flame goes out.
Baffles, materials etc. make a stove more efficient by controling the air flow to the flame, limiting the flamable gasses that escape without being burned, and limiting the heat that's lost up the flue. They make the stove heat the boat more efficiently, but by themselves don't make it any hotter.
So Medsailor's calculations stand on their own, and don't need to take stove design into account.