Wood burning stoves with good heat retention
Supplementing a soapstone fireplace with an powerstone will provide a greater output of heat for larger areas; in laboratory tests the cooling period of the stove was 12 hours with a closed damper and 8 hours with an open vent! A fan can also be added (instead of a heat tank) which will provide an additional kick of hot air and help the warmth circulate throughout the room to nearby areas.
Wood burning stove Contura 520

Soapstone stove Contura 590T and 569T

Tiled stove 790K
