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Deposits of calcium carbonate and magnesium carbonate on parts of the heating system


Volume of working fluid in the heat pump

Charging and draining valve

Used for charging and draining the heating system

Check valve

Prevents the operating fluid from flowing back

Circuit process

In a closed circuit, the working fluid continuously changes its aggregate condition to absorb and release energy

Circulating pump

Electric pump Used to transport heating and brine water.

Coefficient of performance

Ratio between heat output and compressor drive power.

Combi device

Combined therm; heating and hot water production in one device

Combined storage tank

Buffer tank and hot water tank in one tank

Component activation

Heating-cooling system that uses the building mass for heating/cooling

Compression heat pump

Heat pump in which the refrigerant is compressed by means of a compressor


Used for the compression of the refrigerant to increase the temperature


Used for the compression of gaseous substances to increase their temperature


Is generated when a gaseous substance cools down on an area, changing the aggregate condition to liquid

Condensate discharge

Piping used to discharge condensate

Condensate pump

Pump that directs the condensate from the heating system to the waste water system


The vapour in the heat pump turns back into liquid by means of the condenser


Used for the transfer of thermal energy of a gaseous substance in the heat pump to the heat distribution system. The gaseous substance releases its energy to the cooler environment, thus becoming liquefied.


Relates to the capacity of a substance to conduct (transport) heat. Substances with low conduction are used for insulation.

Connected load

Gas or power demand of a heat pump

Connection pressure

Pressure of working fluid compared to atmospheric pressure

Contact sensor

Measures the temperature on the surface of solid bodies

Control guided by outdoor temperature

Adjustment of flow temperature of working fluid depending on outdoor temperature

Cooling loss

Emission of unused heat of the heating unit into the environment

Cooling power

Amount of energy extracted from the environment by the evaporator

COP value

The COP value relates to the ratio between the generated and consumed energy of a heat pump


Deterioration of material due to oxygen.


A metal not subject to corrosion is referred to as corrosion-resistant

Crystallisation heat

Amount of thermal energy released by a substance while it changes aggregate condition.