How is the efficiency of the heat pump calculated?

2024-04-08

The efficiency of the heat pump is an important aspect of energy consumption. Heat pumps are generally very efficient, as they supply more energy than they consume. This is expressed on the one hand by the so-called coefficient of performance (COP) - the higher the figure, the more efficient the heat pump. But be careful, the efficiency can be influenced by various factors, such as the outside temperature and the heating requirements of your home. It is therefore important to choose the right heat pump for your specific needs. Remember to carry out regular maintenance to maintain efficiency.


The efficiency of a heat pump is also expressed by the so-called annual coefficient of performance (COP). The seasonal performance factor is a measure of the amount of heat a heat pump generates in relation to the amount of electricity it consumes. The seasonal performance factor includes environmental factors in the calculation and thus represents the effective coefficient of performance of a heat pump throughout the year in real operation. A higher seasonal performance factor means that the heat pump is more efficient and can be assessed individually for each location.


The SPF of a heat pump depends on a number of factors, including

  • Type of heat pump: Air/water heat pumps are generally less efficient than brine/water heat pumps.

  • Heat pump output: A larger heat pump requires more electricity to generate the same amount of heat.

  • Heat requirement of the building: A building with a high heat requirement needs a larger heat pump and therefore consumes more electricity.

  • Outdoor temperature: The outdoor temperature has a major influence on the efficiency of a heat pump. At low outside temperatures, the heat pump has to consume more electricity to generate the same amount of heat.

Typical seasonal performance factors for different types of heat pumps:

  1. Air-to-water heat pumps: 2.5 to 5.33

  2. Brine/water heat pumps: 4.0 to 6.5

Heat pump output

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