Masonry heaters are heat storage and radiation systems that use wood fuel in a time-tested but, to many Americans, surprisingly untraditional way. In contrast to fireplaces or woodstoves that must be stoked frequently, and that warm only the people and things directly in front of them, a masonry heater warms an entire house with a hot, rapidly burning fire typically built once a day. The intense heat and hot gases generated in the unit’s firebox are stored in the masonry body of the heater and released throughout the home. The larger the mass of masonry material, the more heat it can store. One fire lasting only a few hours can produce and store enough heat to last a day or longer.