How to choose an electric water heater? In fact it is not difficult as long as these aspects are

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世上沒有免费午餐，容量越大耗电越多，人少配大缸只会是浪费。加热速度看功率及容量，加热省电看效率及保温。双管加热快同时功率大，所以耗电与单管沒啥分別。