Water heater heating method and water heater

The embodiment of the invention provides a water heater heating method and a water heater, the method is applied to the water heater, and the water heater at least comprises a control unit, at least two heating elements and a heating switch connected with each heating element; the control unit comprises at least two signal output interfaces, and each signal output interface is connected with one heating switch; the method comprises the steps that the heating power and timing parameters of the water heater are obtained; controlling each signal output interface to generate a corresponding control signal according to the heating power and the timing parameter; and according to the control signal corresponding to each signal output interface, the on-off state of a heating switch corresponding to the signal output interface is controlled, so that heating of the water heater is achieved. 本申请实施例提供一种热水器加热方法及热水器，所述方法应用于热水器，所述热水器至少包括控制单元、至少两个加热元件和与每一加热元件连接的加热开关；所述控制单元包括至少两个信号输出接口，每一信号输出接口与一个加热开关连接；所述方法包括：获取所述热水器的加热功率和计