The invention discloses a gas water heater. The gas water heater comprises a shell, wherein a heat exchanger, an intelligent cabin combustion chamber, a direct-current brushless fan and a fuel gas proportional valve are arranged in the shell from top to bottom in sequence. A switch power supply is further arranged in the shell, an intelligent controller, a circulating water pump, an environment temperature sensor and a flow sensor are further arranged inside the shell, and the intelligent controller is connected with the circulating water pump, the environment temperature sensor, the flow sensor, the switch power supply, the intelligent cabin combustion chamber, the fuel gas proportional valve and the direct-current brushless fan. According to the intelligent pressurization control methodbased on the gas water heater with the circulating water pump, for the water heater which is started in small-flow and pressurized mode, in the pressurizing process, after a user closes a faucet, thecirculating water pump is stopped immediately, so that the circulating water pump is prevented from continuously running, the pressure keeping-down is caused, the service life of the water pump is prolonged, and hot water is prevented from overheating and thus scalding the user.