Greenstone Soapstone Masonry Heaters use a labyrinth of core heat exchange chambers to capture the energy of an efficient, clean-burning fire in its stone mass, and radiate that heat evenly over many hours, resulting in the world’s most comfortable homes. These radiant fireplaces are the only American made soapstone heaters, featuring soapstone from Brazil and India, time test sources... https://www.greenstoneheat.com/