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The banging is numerous, that's why I don't believe that it is water hammer. It only occurs when water running, not stopped. The banging starts after about 15 sec of hot water is running and...

My house is 4 years old. We moved in 2 years ago. There was no baning at that time. About 1 year ago, the house developed 2 banging sounds at different spots.
1. When I runn my up stairs...