A fume enforcedly discharging gas water heater with a fuel battery, including a water valve, an gas valve, an burner assembly, a combustion chamber, a heat interchanger, a fume collecting cover, a fume discharging tube, a water outlet, and a control system. The control system has a control circuit CPU, a pulse igniter, a air blower, a wind pressure switch, a water flow sensor, a solenoid valve A, a solenoid valve B and an adjusting valve. The utility model is characterized in that the utility model is comprised of a fuel battery, a fuel inlet is set on the fuel battery, two linkage valves linking with the water pipeline is set on the fuel gas pipe connected with the fuel battery, and the fuel battery is electrically connected with the control system, and provide power for the control system though the electricity generation of the fuel battery. The utility model have the advantages that the electric appliance of the water heater can work normally under the condition of no AC power, enabling the fume discharging to be performed enforcedly, and solving hidden danger of the high pressure electric leakage of the fume enforcedly discharging gas water heater.