end-grain block flooring from http://www.apartmenttherapy.com/renovation-inspiration-cartolinas-diy-endgrain-block-flooring-198394
von Joep van Os Architectenbureau Mehr
masonry heater... firebox and air chambers constructed to promote super hot-burning fire... a hotter fire allows resins/sap to burn, bringing the fuel-to-energy conversion to over 90% efficiency... masonry heater is surrounded by 4 to 6 inches of high thermal mass material that acts as a heat battery, absorbing all that extra heat and releasing it slowly over time ~ sigi koko
masonry heater, bit more high tech than the rocket stove. Hot fire converts upwards of 94% of available heat energy from the wood. (normal fire converts only 40%). The excess heat is used to heat a thermal mass (e.g. cob, stones), and the heat is released into the space for hours after the fire has burned out. One fire a day will keep a well-insulated home warm in winter. The door above is a bake oven. This example was built over 15 years ago. Still used & still working great!