NOVELTY - A combined heat and power co-generation system (100) includes a fuel cell stack (110), a fuel treatment device (120), an air supply device (130), a cooling device (160), a controller (150) and a water tank (170) all accommodated in a case (101). The fuel cell stack, the cooling device, and the tank are connected together by coolant circulation pipes. An exhaust passage for releasing the waste gases from the fuel treatment device includes a heat exchanger (162) connected to the water tank to recover heat of waste gases.    USE - Combined heat and power co-generation system for fuel cell.    ADVANTAGE - Reduces loss of heat discharged to atmosphere, since cooling circulation pipes of shorter length connect fuel cell stack, cooling device, and fuel tank and are enclosed inside case. Improves energy utilization efficiency, since waste heat produced during reforming process in fuel treatment device as well as heat from fuel cell stack can be recovered and stored as hot water in water tank. Establishes area for waste heat recovery, since fuel cell stack and cooling device are provided inside case. Allows for addition of modulated auxiliary water tank, enabling system to adapt to consumer demands.    DETAILED DESCRIPTION - A combined heat and power co-generation system (100) includes a fuel cell stack (110), a fuel treatment device (120), an air supply device (130), a cooling device (160), a controller (150) and a water tank (170) all accommodated in a case (101). The fuel cell stack produces electricity by electro-chemical reaction of hydrogen and oxygen. The fuel treatment device reforms generating material to supply hydrogen-containing reformed gas to the stack. The air supply device supplies oxygen to the stack. The cooling device recovers heat in the fuel cell stack to keep it at a fixed temperature. The recovered heat is stored as hot water in the water tank. The controller is powered by the electricity from the stack to control start-up, stop, and generating operations of the system. The fuel cell stack, the cooling device, and the tank are connected together by coolant circulation pipes. An exhaust passage, provided to the fuel treatment device, releases the waste gases produced during reforming the generating material and includes a heat exchanger (162) connected to the water tank to recover heat of waste gases.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of a combined heat and power co-generation system.    Combined heat and power co-generation system (100)    Case (101)    Fuel cell stack (110)    Fuel treatment device (120)    Air supply device (130)    Controller (150)    Cooling device (160)    Heat exchanger (162)    Water tank (170)