Division 3.9 Remarks to air sourced heat pumps

The H_HP values shown in Tables 1 and 2 above are based on H_HE values which includes not only the hours the heat pump is used, but also the hours that the supplementary heater is used. As the supplementary heater is outside of the system boundaries described in Section 3.4, the H_HE values for all air source heat pumps are appropriately adjusted to only account for the useful heat delivered by the heat pump itself. The adjusted H_HP figures are shown in Tables 1 and 2 above.

In the case of air sourced heat pumps with capacity reported for design conditions (and not for standard testing conditions), the H_HE values should be used^f1.

Only ambient air, i.e. outdoor air, can be the source of energy for an air-sourced heat pump.