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Participating countries

Austria, Canada, France, Germany, Japan, Norway, Sweden, USA

Test procedure and seasonal performance calculation for residential heat pumps with combined space and domestic hot water heating

The Annex investigated the testing of the most common combined heat pump systems with heating of domestic hot water by

  • desuperheating
  • subcooling of the condensate
  • cascade hot water heat pump
  • using the heat from the supply line of the heating system


  • The first objective of the Annex was to work out a test procedure, which provided the necessary data in order to calculate the overall seasonal performance factor of combined heat pump systems with a minimal require-ment of testing equipment and testing time.
  • The second objective was to work out an easy to use method for calculating the seasonal performance factor of the systems.