Terra Stove is an eco-friendly domestic wood heating appliance that can efficiently transform clean wood waste into heat energy. It comprised of two sections, the inner firebox and the adjustable external thermal mass shell. The firebox offers a clean combustion zone as well as internal flue gas treatment to reduce pollution. The exterior thermal mass shell aids in temperature storage and control. Is constructed using earthen thermal mass cob, and finished off with earthen plaster render. Both the cob and earthen plaster was chosen for their low embodied energy and high specific heat.