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My house has had a geothermal heat pump since Oct. 1980. Mine is open loop, with two source wells feeding one 1 hp pump in the one side yard and two return wells in the back yard, all about 20 feet deep. Living in Florida along the coast, once you go more than a foot or two deep around here, it is pure sand until you hit limestone about 25 to 40 feet down.
I've had no problems with groundwater deposits in my pipes and coils, though friends with similar open loop systems have all had deposit problems. A local geologist told me that my property sits above the flow of some underground springs, which may explain the lack of deposits.
This system is one reason for my extremely low electricity use, typically around 1000 kwh/yr.
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