Having a discussion about heat distribution from our chimney (exciting times to be had on a Friday night at our place) with friends. We explained that from our experience, the walls around the chimney do not heat up. We showed a friend that the wall above the fire was not warm, however they could not rest until all walls were tested for evidence of warmth. Going through to the next room with a wall adjoining the chimney, they were proud to show us that it was in fact warmed up from the fire, exclaiming "See, I am worth my weight in salt!"