http://greenbuildingelements.com/2008/0 ... he-answer/
"...they heat only the air in the home, which can store very little of the heat. To compensate,
woodstove users – like most fireplace users – opt for a slower, cooler fire that yields a
modest amount of heat for longer. In doing this, they get less heat from their wood and
send the rest, as smoke, up the chimney."