Efficient wood burning heat plus high mass materials creates efficiency and comfort. This example shows a masonry heater, that burns at twice the temperature of a normal fire. The excess heat is absorbed into the sculpted & tile mass, and then released into the space slowly, long after the fire has gone out. Photo from www.danieltutorial.wordpress.com/2014/01/22/sobe-de-lut-facute-manual-superbe/
