
In our house, we can use hot and cold water everyday. The cold water come from ground and pumped to the house. In the house, cold water is distributed to the sink at first floor and to the bath, wash basin and toilet at the second foor. The other cold water is distributed to the cold water tank at the top of house. Thus is the process of cold water supply. For hot water supply, cold water from from cold water tank is distributed to the hot water tank at second floor. In hot water tank, cold water is changed to be hot water. The hot water is distributed to the bath, wash basin at second floor and to the sink at first floor. Because there are hot and cold water at bath, wash basin and sink, we can mix them to get warm water.
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