Tulikivi soapstone fireplace
Imagine a fireplace that radiates heat for 24 hours using an armload of wood. A soapstone (aka masonry heater) does just that. As a bundle of wood burns, the heat is absorbed by the natural soapstone which then radiates it outward. Instead of sending the heat up the chimney as in a normal fireplace, the heat is routed through channels in the fireplace that are above, behind, below, and beside the firebox, thus extracting as much energy from the combustion as possible. This results in a pleasant, consistent heat that uses far less wood (or natural gas) than the typical fireplace of today.