这种热水器应该配置控制逻辑电路，当出现无水或水位太低状况时，能够自动关闭加热元件的电源。
The unit shall be equipped with control logic that shuts down all electricity to the heating elements in the event of no water or low water levels in the tank.
文章主要讨论了锅炉汽包水位高低保护系统逻辑判断回路的自动切换。
The paper mainly discusses the automatic switching of the logic estimation circuit of the drum boiler's water level protection system.
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