ANNEX VIIIMethod for calculating the water heating energy efficiency of water heaters

4.Calculation of the annual electricity consumption AEC and the annual fuel consumption AFC

(b)Solar water heaters:

The annual electricity consumption AEC in kWh in terms of final energy is calculated as follows:

AEC=CC× QelecQfuel+ CC× Qelec×QtotaCCmath

The annual fuel consumption AFC in GJ in terms of GCV is calculated as follows:

AFC=QfuelQfuel+ CC× Qelec× Qtotamath