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Department for Business, Energy and Industrial Strategy

Heat pumps

A variety of heat pumps are featured on the ETL

Air Source: Gas Engine Driven Split and Multi-Split (including Variable Refrigerant Flow) Heat Pumps

Air-source, gas engine driven (GED), heat pumps covers products that are specifically designed to transfer heat from the air in one space to the air in another space by means of a refrigeration cycle that is driven by a gas-fired internal combustion engine. ‘Split’ type heat pumps have separate heat collection and rejection units for each space known as ‘indoor’ and ‘outdoor’ units. The ’indoor’ and ‘outdoor’ units are specifically designed to be connected together during installation by refrigerant pipework to form a single functional unit. Variable refrigerant flow (VRF) heat pumps are specifically designed to automatically adjust the flow of refrigerant to each indoor unit so that the heat delivered is matched to the demand.

Packaged Air to Air Heat Pumps (rooftop)

Packaged air to air heat pumps are products that are specifically designed to transfer heat from the air in one space to the air into another space by means of a refrigeration cycle. ‘Packaged’ type heat pumps are single factory assembled units that incorporate all the elements of the refrigeration system and air distribution mechanisms for space heating.

Air to Air Heat Pumps, Split, Multi-Split and VRF

Air to air heat pumps are products that are specifically designed to transfer heat from the air in one space to the air into another space by means of a refrigeration cycle. ‘Split’ type heat pumps have separate heat collection and rejection units for each space known as ‘indoor’ and ‘outdoor’ units. The ’indoor’ and ‘outdoor’ units are specifically designed to be connected together during installation by refrigerant pipework to form a single functional unit. Variable refrigerant flow (VRF) heat pumps are specifically designed to automatically adjust the flow of refrigerant to each indoor unit so that the heat delivered is matched to the demand.

Air to Water Heat Pumps

Air to water heat pumps are products that are specifically designed to transfer heat from the air outside a building to a water-based heating system, by means of a refrigerant cycle.

Water or Brine to Water Heat Pumps

Water or brine to water heat pump systems are specifically designed to transfer heat from the ground to a water-based heating system by means of a refrigeration cycle. Surface water heat pump systems are specifically designed to transfer heat from surface water to a water-based heating system by means of a refrigeration cycle. In a brine to water heat pump, the heat is collected from the ground or surface water by circulating a solution of water and anti-freeze (known as ‘brine’) through a buried or submerged, closed-loop, ground heat exchanger. In a water to water heat pump, the heat is collected from ground water (aquifer) or surface water by circulating the water through a direct, open-loop heat exchanger.

Heat Pump Dehumidifiers

Heat pump dehumidifiers are products that are specifically designed to remove water vapour from moist air using an electrically driven refrigeration cycle.

Heat Pump Driven Air Curtains

Heat Pump Driven Air Curtains are products that are specifically designed to be fitted above a doorway or similar opening, and to produce an air curtain that is specifically designed to reduce the infiltration or transfer of air from one space to another, and that is heated and/or cooled by a heat pump that transfers heat by means of a refrigeration cycle.

Air to Domestic Hot Water Heat Pumps

Air to domestic hot water heat pumps are products that are specifically designed to transfer heat from the ambient air, ground, or water into a system for heating domestic hot water by means of a refrigeration cycle.

Water to Air Heat Pumps, Split, Multi-Split and VRF

Water to air heat pumps are products that are specifically designed to transfer heat from water (in an internal water loop) into the air within the space to be heated by means of a refrigeration cycle. ‘Split’ type heat pumps have separate heat collection and rejection units for each space kn own as ‘indoor’ and ‘outdoor’ units. The ’indoor’ and ‘outdoor’ units are specifically designed to be connected together during installation by refrigerant pipework to form a single functional unit. Variable refrigerant flow (VRF) heat pumps are specifically designed to automatically adjust the flow of refrigerant to each indoor unit so that the heat delivered is matched to the demand.

More information (PDF)