加热棒的工作原理 ：加热棒是一个密封容器，通电后棒内的电热丝产生热量被水体吸收，从而达到加温效果。加热棒内还带有一个温度感应器，当水体温度达到设置温度时，或加热棒内温度超过负荷时，加热棒会停止工作；水体温度低于设置温度时，加热棒又会重新启动。
The working principle of the heating rod: The heating rod is a sealed container. After electrification, the heat generated by the electric heating wire in the rod is absorbed by the water body, so as to achieve the heating effect. There is also a temperature sensor in the heating rod. When the water temperature reaches the set temperature, or when the temperature in the heating rod exceeds the load, the heating rod will stop working. When the water temperature is lower than the set temperature, the heating rod will restart.