masonry heater. Beautiful. I love the multiple sides of he fireplace located at the corner...the wood storage underneath is also clever to lift the fire up to a less stooping level. it looks like it has impressive thermal mass, but would it be hard to funnel the heat through the channels?
Masonry Heaters: Lots of info here Also known as masonry stoves, kachelofens, Russian fireplaces, Finnish fireplaces, Swedish stoves, tile stoves, contra-flow fireplaces, radiant fireplaces and mass-storage fireplaces.