Zero-cold-water pressurization method for gas water heater

The invention discloses a zero-cold-water pressurization method for a gas water heater, and relates to the technical field of gas water heaters. The method specifically comprises the following steps: S1, starting a preset function of the gas water heater, setting a preheating temperature for preheating, then starting a pressurization function to enter a pressurization standby mode, and starting for ignition until the current water flow is greater than the preset starting water flow; and S2, strating a water pump for pressurization work, recording the pump starting water inlet temperature, and keeping the working power of a pressurizing pump unchanged at the moment. According to the zero-cold-water pressurization method for the gas water heater, a user can use hot water at any time, the timing circulation time can be set according to the environment temperature and the actual condition, the error between the actually-measured water temperature and the set value is further reduced, the user can control the wate