Gas water heater

The utility model discloses a gas water heater, relates to the technical field of household appliances, and aims to solve the problem that water in a heat exchanger is heated by waste heat and the temperature of the water is increased when the gas water heater is used again after water supply is cut off. The gas water heater comprises a heat exchanger and a damping device. The heat exchanger comprises a water inlet pipe, a water outlet pipe and a bypass pipe; the water inlet pipe and the water outlet pipe are communicated with the heat exchange area of the heat exchanger; the bypass pipe comprises a water inlet section and a water outlet section, the water inlet section communicates with the water inlet pipe, the water outlet section communicates with the water outlet pipe, a first water inlet is formed in the end, close to the water inlet section, of the water outlet section, and the radial size of the first water inlet gradually decreases from the end close to the water inlet section to the end away from th