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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.
This really depends on where you are and a lot of other factors. A minimum acceptable flow rate for a family of 4 would be about 3 gallons per minute into the well. A good (good flow rate, we aren't taking about the quality of the water here, just the volume) well would produce 5 or more gallons per minute. According to my local well driller here in Western PA, a gusher is 20 gallons per minute coming into the well. This really depends on where you are and a lot of other factors. A minimum acceptable flow rate for a family of 4 would be about 3 gallons per minute into the well.