And so it begins ...

That's a top of the range model with a curved front, the more basic models are rectangular. They extend through the wall and are loaded from outside the room. The inside is spit in two horizontally with a stone, the fire box is at the bottom, the smoke goes forward then upwards and back exiting via a flue above the fire door. They also often benches down the sides so you can warm your back like you can against that very fine Kachelofen in the Bichlwirt.