Division 2 TECHNICAL PARAMETERS OF WATER HEATERS

The following parameters shall be calculated for water heaters under average climate conditions:

1. (a)

   the water heating energy efficiency η_wh in %, rounded to one decimal place;

   in addition, for solar water heaters under average climate conditions:

2. (b)

   the annual non-solar heat contribution Q_nonsol in kWh in terms of primary energy for electricity and/or in kWh in terms of GCV for fuels, rounded to one decimal place;

3. (c)

   the heat generator water heating energy efficiency η_wh,nonsol in %, rounded to one decimal place;

4. (d)

   the annual auxiliary electricity consumption Q_aux in kWh, rounded to one decimal place.