Vertical closed loops are typically installed where space is limited. A pair of pipes with a special u-bend are bored into the earth several hundred feet below the surface. Typically, 150-250 feet per ton. The hole is then filled with a grout for good heat exchange.
Typically very good heat exchange Constant ground temperature Little to NO maintenance Can be installed on virtually any property
Expensive to Install
The diagram below illustrates the vertical closed loop shown on a small lot in the photo to the left.