Drainage control method and device of water heater

The invention relates to the technical field of water heater drainage control, and discloses a water heater drainage control method and device.The method comprises the steps that whether the environment temperature parameter of the environment where a water heater is located is smaller than or equal to a preset water solidification temperature threshold parameter or not is judged; if yes, the water temperature parameter and the current volume parameter of target storage water in the water heater are obtained, and the total volume change parameter of the target storage water is predicted in combination with the environment temperature parameter; according to the total volume change parameters, whether drainage operation needs to be executed on the water heater or not is judged, and if yes, drainage control parameters of the water heater are determined. It can be seen that whether the water heater needs to be drained or not can be judged according to the environment temperature parameter of the water heater, th