WNY wrote:Depends on how hard you are running it
There is no such thing as an "average" stack temp. (kinda like saying what is your average driving speed?........While you can figure it out mathematically after a road trip, it is totally variable & under your control)
Your oil furnace runs at a constant temp & provides heat to your house based on the amount of time it is on. A coal appliance is burning all the time & you regulate you home's heat by varying the heat output of the appliance. (I've only run coal stoves
so I am no expert on running coal furnaces, but I think the principle is the same......Higher stove/furnace temps create more heat for your home, not just time on. If I am wrong about this, I'm sure one of our resident furnace experts will correct me.