Also, isn't that heat only convection? This doesn't seem to take into account the fact that brick or stone fireplaces absorb heat and then radiate it back into

Also, isn't that heat only convection? This doesn't seem to take into account the fact that brick or stone fireplaces absorb heat and then radiate it back into the room. It's not all about moving hot air. The fireplace itself gets hot and that feeds back into the room through radiative heat.