What does ‘XXS category’ mean?

With regards to energy labels and ratings, the XXS category is intended for smaller water heaters with a storage tank (boilers) for in the kitchen. The larger the category, the higher the efficiency must be in order to carry the same label.

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On Friday the 11'th of January 2019 all Quooker UK offices will be closed. All telephones will be on answer service.
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