# The Ecodesign for Energy-Related Products and Energy Information Regulations 2021, Paragraph 4: Weighted water consumption


(1) The weighted water consumption (WW) of a household washing machine or of the washing cycle of a household washer-dryer must be rounded to the nearest integer and calculated in litres as follows—
WW= (A × WW,full + B × WW,1/2 + C × WW,1/4).
(2) For the purposes of sub-paragraph (1)—
(a) WW,full is the water consumption of—
(i) a washing machine, or
(ii) the washing cycle of a household washer-dryer,
for the eco 40-60 programme at rated washing capacity, in litres and rounded to one decimal place;
(b) WW,½ is the water consumption of—
(i) a household washing machine, or
(ii) the washing cycle of a household washer-dryer,
for the eco 40-60 programme at half of the rated washing capacity, in litres and rounded to one decimal place;
(c) WW,1/4 is the water consumption of—
(i) a household washing machine, or
(ii) the washing cycle of a household washer-dryer,
for the eco 40-60 programme at a quarter of the rated washing capacity, in litres and rounded to one decimal place;
(d) A, B and C are the weighting factors referred to in paragraph 2(7).
(3) For household washer-dryers with a rated washing capacity lower than or equal to 3 kg, the weighted water consumption of the wash and dry cycle is the water consumption at rated capacity, rounded to the nearest integer.
(4) For all other washer-dryers, the weighted water consumption (WWD) of the wash and dry cycle must be rounded to the nearest integer and calculated as follows—
WWD= [ 3×WWD,full±2×WWD, 1 2 ] 5
(5) For the purposes of sub-paragraph (4)—
(a) WWD,full is the water consumption of the wash and dry cycle of a household washer-dryer at rated capacity, in litres and rounded to one decimal place;
(b) WWD,½ is the water consumption of the wash and dry cycle of a household washer-dryer at half of the rated capacity, in litres and rounded to one decimal place.

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Source: https://www.legislation.gov.uk/ukdsi/2021/9780348222920/schedule/10/paragraph/4 (the official version)
Page: https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-regulations-2021/schedule-10/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.