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An open loop pulls groundwater into the heat pump, where heat is extracted, leaving water to be disposed of generally in one of two ways. First, the water can be discharged into a nearby body of water or into a ditch or drain. The second method would involve pumping the water back to the original source, likely through a second well to return the water below ground. Open loops allow homeowners to tap into groundwater that sits underground at a rather consistent temperature year round.

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