A simple water heater is more clever than it seems

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延伸阅读 1

电热水器有上下两个加热位置和相应的恒温器。上部需要热量时，系统把既有的功率切到上部，以改变先可用的热水量；两根元件并不自动意味着双倍瞬时功率。

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two heating elements sticking into the tank at two different heights.

We have the same 4500 watts that we did before, but now it’s up here