... 1-2.5L every time, according to 20 times a day, it will lose 20-100 L, and this product by ... reach 10% to 15%. C) Save worry: 24 hours a day, no need to worry for without hot water; Just One ... work. E) Use convenient, the function is all ready, efficient, high quality Five Safety insurance: 1, water and electricity, the double isolation ...