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Hello,
You would either pump the water back down the well (above the intake), or you can have a second well to do this, or you could have a leeching field.
The example I gave was from my brother, who stayed in that very house (they run it as a B&B). So, it is a real number. To corroborate it, I used to work in an office condo (back in the late 80's) that had this type of system, and the heating bill was ~$100 a winter.
I'm going to be doing more research on this -- my mother needs a new heating system, and she is very interested. We could even put a small PV solar panel on her house to offset the electricity use.
This works on the same principle as a refrigerator: the heat pump is able to move/concentrate heat very easily with the temperature of ground water.
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