Water Supply Industry Interpretations and Advice

  • Area of Interest : Installation
  • Topic : Overflow arrangements
  • Title : Requirements for an overflow for a cistern supplied via a float valve
  • Clause Reference : Schedule 2 paragraph 16 (4) (a)
  • Reference Number : I16
  • Decision Date : October 2003

Where a float valve is fitted to a cistern, including primary circuit feed cisterns, an overflow (warning pipe) must be provided, regardless of whether the float valve is permanently or temporarily connected to the mains supply.