BS 8542:2011 PDF

Scope: This British Standard gives recommendations for calculating the volume of public mains water that is consumed for domestic use in non-domestic buildings. It gives recommendations for estimating the total water use from the buildings’ components, allowing consumption to be indicated on a whole building level against other buildings for best practice levels. This standard is not for use as a design guide. It provides a framework for and details the development of water use calculation methodologies in non-domestic buildings. It provides recommendations for the quality of data used to calculate water use for each component in non-domestic buildings and also standardized reporting for product performance data. It applies to both new and existing buildings and covers: Water that is sourced from unwholesome sources such as rainwater harvesting systems or greywater reuse systems;and Water that is sourced from wholesome sources including both hot and cold water.

BS 8542:2011 Referenced Document

BS 8525-1 Greywater systems - Code of practice
BS EN 1111 Sanitary tapware. Thermostatic mixing valves (PN 10). General technical specification*， 2020-02-25 Update
BS EN 1286 Sanitary tapware - Low pressure mechanical mixing valves - General technical specification
BS EN 1287 Sanitary tapware. Low pressure thermostatic mixing valves. General technical specification*， 2020-02-25 Update
BS EN 13407 Wall-hung urinals. Functional requirements and test methods*， 2015-01-01 Update
BS EN 14055 WC and urinal flushing cisterns*， 2018-01-01 Update
BS EN 14743 Water conditioning equipment inside buildings - Softeners - Requirements for performance, safety and testing
BS EN 200 Sanitary tapware. Single taps and combination taps for water supply systems of type 1 and type 2. General technical specification
BS EN 50242 Electric dishwashers for household use. Methods for measuring the performance*， 2017-03-31 Update
BS EN 60456 Clothes washing machines for household use. Methods of measuring the performance*， 2024-02-29 Update
BS EN 817 Sanitary tapware — Mechanical mixing valves (PN 10) — General technical specifications
BS EN 997 WC pans and WC suites with integral trap

2011 BS 8542:2011 Calculating domestic water consumption in non-domestic buildings. Code of practice