by
Bosch Thermotechnik GmbH
Heat pumps also use the power of the sun, i.e. solar heat stored in the air, the soil and the ground water. A heat pump takes heat from the soil, for example, so that it can be used by the heating and hot water system. The principle on which such a pump is based is not new, as it is the reverse principle of the refrigerator, which extracts heat ...