Commission Delegated Regulation (EU) No 812/2013Show full title

ANNEX VIII Method for calculating the water heating energy efficiency of water heaters

1. For the purposes of compliance and verification of compliance with the requirements of this Regulation, calculations shall be made using harmonised standards the reference numbers of which have been published for this purpose in the Official Journal of the European Union, or using other appropriate calculation methods that take into account the generally recognised state-of-the-art methods. They shall meet the technical parameters and calculations set out in points 2 to 6.

Technical parameters used for the calculations shall be measured in accordance with Annex VII.

2. Technical parameters of water heaters

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

(a)

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

(b)

the annual electricity consumption AEC in kWh in terms of final energy, rounded to the nearest integer;

in addition, for water heaters using fuels under average climate conditions:

(c)

the annual fuel consumption AFC in kWh in terms of GCV, rounded to the nearest integer;

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

(d)

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

(e)

the annual auxiliary electricity consumption Q_aux in kWh in terms of final energy, rounded to one decimal place;

in addition, for solar water heaters and heat pump water heaters under colder and warmer climate conditions:

(f)

the parameters set out in points (a) to (c);

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

(g)

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. Calculation of the water heating energy efficiency η_wh

(a) Conventional water heaters and heat pump water heaters:

The water heating energy efficiency is calculated as follows:

For water-/brine-to-water heat pump water heaters, the electricity consumption of one or more ground water pumps shall be taken into account.

(b) Solar water heaters:

The water heating energy efficiency is calculated as follows:

Where:

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

(a) Conventional water heaters and heat pump water heaters:

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

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

(b) Solar water heaters:

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

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

5. Determination of the smart control factor SCF and of smart control compliance smart

(a) The smart control factor is calculated as follows:

(b) If SCF ≥ 0,07, the value of smart shall be 1. In all other cases, the value of smart shall be 0.

6. Determination of the ambient correction term Q_cor

The ambient correction term is calculated as follows:

(a)

for conventional water heaters using electricity:

(b)

for conventional water heaters using fuels:

(c)

for heat pump water heaters:

Where:

the k-values are given in Table 8 for each load profile.

Table 8

k-values

	3XS	XXS	XS	S	M	L	XL	XXL
k	0,23	0,23	0,23	0,23	0,23	0,23	0,23	0,0