# The Ecodesign for Energy-Related Products and Energy Information Regulations 2021, Paragraph 2: Energy efficiency index


(1) For the calculation of the EEIW, the weighted energy consumption of the eco 40-60 programme at—
(a) the rated washing capacity;
(b) half of the rated washing capacity; and
(c) one quarter of the rated washing capacity;
must be compared to its standard cycle energy consumption.
(2) The EEIW must be rounded to one decimal place and calculated as follows—
EEIW = (EW/SCEW) × 100.
(3) For the purposes of sub-paragraph (2)—
(a) EW is the weighted energy consumption of the household washing machine or of the washing cycle of the household washer-dryer;
(b) SCEW is the standard cycle energy consumption of the household washing machine or the washing cycle of the household washer-dryer.
(4) The SCEW must be rounded to three decimal places and calculated in kWh per cycle as follows—
SCEW = -0.0025 × c2 + 0.0846 × c + 0.3920.
(5) For the purposes of sub-paragraph (4), c is—
(a) the rated capacity of the washing machine; or
(b) the rated washing capacity of the washer-dryer;
for the eco 40-60 programme.
(6) The EW must be rounded to three decimal places and calculated in kWh per cycle as follows—
Ew=A×Ew,full±B×Ew, 1 2 ±C×Ew 1 4
(7) For the purposes of sub-paragraph (6)—
(a) EW,full is the energy consumption of—
(i) the washing machine; or
(ii) the washing cycle of the household washer-dryer;
for the eco 40-60 programme at the rated washing capacity, rounded to three decimal places;
(b) EW,½ is the energy consumption of—
(i) household washing machine; or
(ii) the washing cycle of the household washer-dryer;
for the eco 40-60 programme at half of the rated washing capacity, rounded to three decimal places;
(c) EW,1/4 is the energy consumption of—
(i) the washing machine; or
(ii) the washing cycle of the household washer-dryer;
for the eco 40-60 programme at a quarter of the rated washing capacity, rounded to three decimal places;
(d) A is the weighting factor for the rated washing capacity and rounded to three decimal places;
(e) B is the weighting factor for half of the rated washing capacity and rounded to three decimal places;
(f) C is the weighting factor for a quarter of the rated washing capacity and rounded to three decimal places;
(g) for washing machines with a rated capacity lower than or equal to 3 kg and washer-dryers with a rated washing capacity lower than or equal to 3 kg—
(i) A is equal to 1;
(ii) B and C are be equal to 0;
(h) for other washing machines and washer-dryers, the values of the weighting factors depend on the rated capacity according to the following equations—
(i) A = -0.0391 × c + 0.6918;
(ii) B = -0.0109 × c + 0.3582;
(iii) C = 1 - (A + B);
where c is the rated capacity of the washing machine or the rated washing capacity of the washer dryer.

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Source: https://www.legislation.gov.uk/ukdsi/2021/9780348222920/schedule/10/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-regulations-2021/schedule-10/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.