热水器镁棒有绝缘、防止腐蚀的作用。因为热水器内胆是长期存水的,而且水经过加热后就会产生水碱、水垢,再附着在内胆中导致加热效率减低,同时会缩短使用寿命,而镁棒也叫镁阳极,可以释放镁离子,这样能有效缓解水碱、水垢的产生,这样也就避免其腐蚀内胆。
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