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If these two pressures are different, the water will be forced to move. And as the graph shows, water at 82 o C is about 1% less dense than the same water at 65 o C. This may not sound very much, but it's enough. The difference in the density of the water in the flow and return pipes is about 10 kg/m 3.
The water delivered to your home should flow at a pressure between 35 and 80 psi (pounds per square inch). Your local water utility uses regulators to deliver your water to you at between 50 and 70 psi, but a problem in your plumbing system could cause this pressure to change once it reaches your home. Regulator valves help prevent high water pressure, but these can fail, and this puts a strain on your plumbing and appliances.