SOLID OXIDE FUEL CELL SYSTEM

A solid oxide fuel cell system (100) includes a solid oxide fuel cell (11) that produces electricity by using a hydrogen-containing gas and an oxidant gas, an exhaust-gas path (12) via which an exhaust gas discharged from the solid oxide fuel cell (11) flows, a circulation path (13) via which a coolant circulates, a first heat exchanger (14) that is disposed on the exhaust-gas path (12) and the circulation path (13) and enables heat exchange between the exhaust gas and the coolant, a second path (15), via which condensed water produced when the exhaust gas is cooled in the first heat exchanger (14) flows, that branches from the exhaust-gas path (12) and is connected to the circulation path (13), a second tank (16) that stores reservoir water, and a second heat exchanger (17) that is disposed in the second tank (16) and on the circulation path (13) and enables heat exchange between the reservoir water and the coolant.