Thermal pumps of the type «Water-water» use underground groundwater as a source of thermal energy. For the operation of this device, two wells are required, one of which is used to supply warm water, and the other to pump it back, after the heat of heat. The main indicator of the effective operation of the pump-the coefficient of useful action-directly depends on the actual temperature of the heat source and the type of the used heat pump and reaches 2.5-5.4.
