Control method of water heater

The invention provides a control method of a water heater, which comprises the following steps of: S1, setting a preset water outlet temperature, and acquiring a preset highest water outlet temperature and a preset lowest water outlet temperature according to the preset water outlet temperature; and S2, the water outlet temperature is controlled to periodically fluctuate between the preset highest water outlet temperature and the preset lowest water outlet temperature. By controlling the water outlet temperature to periodically fluctuate between the preset highest water outlet temperature and the preset lowest water outlet temperature, the temperature fluctuates in a certain range while it is guaranteed that the water temperature does not change in an overlarge range, and consequently the bathing comfort of a user becomes poor, the temperature fluctuation can stimulate blood to accelerate circulation, and comfort is achieved. 本发明提出了一种热水器的控制方法，包括如下步骤：步骤S1，设定预设出水温度，根据预设出水温度获取预设最高出水温度及预设最低出水温度；步骤S2，控制出水温度在预设最高出水