A stove will draw air in from near the floor where the colder, damper air will be, heat this air and lose it through the chimney, drawing in more damper, cooler air.
That's why they'll dry out an inside space as well as giving off loads of heat. Most stoves/burners are 75-85% efficient, whereas an open fire is about 25-30% efficient.
Also, as I understand it., wood burners are designed to do most of their heating with the flue / chimney.
Also, as I understand it., wood burners are designed to do most of their heating with the flue / chimney.