# The Water Supply (Water Fittings) Regulations 1999, Paragraph 29


(1) Subject to paragraph (2), clothes washing machines, clothes washer-driers and dishwashers shall be economical in the use of water.
(2) The requirements of this paragraph shall be deemed to be satisfied in the case of machines having a water consumption per cycle of not greater than the following–
(a) for domestic horizontal axis washing machines, 27 litres per kilogram of washload for a standard 60°C cotton cycle;
(b) for domestic washer-driers, 48 litres per kilogram of washload for a standard 60°C cotton cycle;
(c) for domestic dishwashers, 4.5 litres per place setting.

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Source: https://www.legislation.gov.uk/uksi/1999/1148/schedule/2/paragraph/29 (the official version)
Page: https://openlegislation.uk/water-supply-water-fittings-regulations-1999/schedule-2/paragraph-29
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.