Details of the water calculation methodology for assessing the ‘whole-house’ water efficiency of new dwellings.
This document sets out the water calculation methodology for assessing the ‘whole-house’ water efficiency of new dwellings. The water calculator tool (Excel spreadsheet) is also available here to download.
The calculation method is to be used to assess compliance against the water performance targets in building regulations 17 K. The code for sustainable homes now uses this calculator as the assessment methodology for WAT1.
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