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Understanding Regulation 4 and water efficiency in the UK

As part of the Bathroom Association’s Future of Water Theatre at InstallerSHOW 2025, masterclasses featuring the industry’s experts came together to discuss some of the biggest challenges facing the sector. In this essential industry forum, experts from across the UK water sector come together to unpack Regulation 4, certification routes, building regulations, and the EU Drinking Water Directive.

If you were unable to view the discussion live at the show, the recording is now available for viewing.

Hosted by the Bathroom Association’s Technical Director, Andy McLean, the discussion featured speakers:

Together, they explore:

  • What Regulation 4 covers and why it matters
  • Certification — what’s required, what’s optional, and how it impacts trust
  • Responsibilities of manufacturers, installers, and homeowners
  • The connection between Reg 4 and Building Regs Part G
  • The future of the Mandatory Water Efficiency Label (MWEL)
  • Preparing for the EU Drinking Water Directive (2027)
  • Installer compliance, consumer awareness, and legal risk

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