Encyclopedia
Heat pump
A heat pump is a device that transfers heat from an appropriate heat source (primarily underground or surface water, soil or air) and, using an additional energy source (for example, gas or electricity), converts it into a heat source with a higher temperature
Source: "Explanations to the Commodity Nomenclature of Foreign Economic Activity of the Russian Federation (HSN Russia)" (prepared by the Federal Customs Service of Russia) (volume 3, sections XII - XVI, groups 64 - 84)