Water flows to the houses by passing through many processes. First, it comes from the earth by being pumped through the pipes to the main water tanks which spread around the house (bath tub, sink, kitchen,etc). Its temperature is the same with earths. In that tanks, it flows into two other tanks; hot tank, and cold tank. In hot tank, it is heated by the help of solar power which use the energy from the light of the sun. It is kept in that tank and will be reheated continuously. The same process is happened in the other tank. But it's different from the final temperature. The solar power cools the water off, not heat it. After all of the processes is finished, the water is already to used.
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