Gas water heater

The invention discloses a gas water heater which comprises a shell, a heat exchanger, a burner used for heating the heat exchanger, an air return duct and a draught fan. The shell is provided with a smoke outlet and an air inlet. The heat exchanger is arranged in the shell. The burner is arranged in the shell and communicates with the smoke outlet. The air return duct is a sealed piece provided with only an air intake port and an air exhaust port, wherein the air return duct is arranged in the shell, the air intake port communicates with the air inlet, the air exhaust port communicates with the burner, and the draught fan is connected to the air return duct. According to the gas water heater provided by the embodiment of the invention, the sealing effect of the air return duct is improved, damage to the gas water heater caused by air leakage of the air return duct is avoided, the ventilation rate of the gas water heater is improved, and gas can be sufficiently burnt; and besides, the air return duct can isola