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为什么家里的电热水器在使用一段时间后制热效果就不如以前了呢?家电维修方面的专家指出．电热水器在使用一段时间后,自身也有必要洗一下澡,因为换热器表面结了水垢。
Why home water heaters in the use of the heating effect after a period of time as it used to do? Appliance repair experts said. Electric water heater in use for some time, it is also necessary to wash their own bath, because the heat exchanger surface scaling.