For what purpose, using what source? Piping buried under ground, about 3 to 5 feet is a great way to improve the efficiency of a heat pump. This is considered to be geothermal heat. If you mean heat from a steam or hot water spring, such as we have here in northern California/Nevada, then the user either uses a heat exchanger at the source, or pipes the steam or hot water to the point of use. It gets messy due to the chemicals in the water or steam. That said, if you are running a power plant with it, and most of your income from it is profit, then the losses of equipment and waste disposal are out weighed by the money being earned.
