![]() The water cannot be allowed to boil in the heat exchanger. That’s well below atmospheric pressure, but it would only take about 33 feet 10 inches of water column in the discharge pipe to achieve that. At 53 F, water will boil if the pressure drops to. It’s because of the boiling point of water. The lower the water level in the well, the deeper the vacuum will be. ![]() The weight of the water in the discharge pipe will cause the water pressure at the top of the pipe to drop into a vacuum (below atmospheric pressure). You must maintain positive water pressure inside the heat exchanger of the geothermal unit. This setup has to be configured properly to work though. That’s good for everyone! See, the weight of the water in the discharge pipe is pulling the water from the one side, while the pump is pushing water from the other side. This way the pump does not have to work as hard and uses less electricity. ![]() ![]() Typically, the discharge pipe will be lowered into the well so that the end of the pipe is below the water level in the well. It will have the discharge pipe from the geo unit, and this is where all the water goes after the geo unit has extracted or added the BTUs it needs for heating or cooling. The other well is the “dump well” for the geothermal unit. One well will have a constant pressure pump installed and supply water for the residence as well as the geothermal unit. Usually people who have this type of setup have two wells. This is an application where ground water is pumped through the unit and then dumped back into the ground. Now we are talking about a fresh water, “pump and dump” system. The question comes up again and again: what type of valve should I use for my geothermal unit? ![]()
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