So far as a wood stove, I figure I can build a large fire or a small fire in
the largest model, but can only build a small fire in the small model.
So I got the largest model, and this has worked out just fine. Small fires
on warmer days, larger fires on cold days.
And a woodstove is about the furthest thing from being scientific (BTU's,
etc) you can find. Heat output would differ depending on type of wood
burning, how much wood burning, size of pieces of wood burning, etc.
But they do give BTU ratings for various models.