NCC 2022 Volume Three - Plumbing Code of Australia
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Classification
Building class 1a Building class 1b Building class 2 Building class 3 Building class 4 Building class 5 Building class 6 Building class 7a Building class 7b Building class 8 Building class 9a Building class 9b Building class 9c Building class 10a Building class 10b Building class 10c

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Classification
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B1

Part B1 Cold water services

Part B1 Cold water services

QLD B1D2 Water efficiency2019: B1.2

Delete subclause B1D2(2) and insert QLD B1D2(2) as follows:

(2) For a new Class 1 or Class 2 building, in an area serviced by a Network Utility Operator water supply, toilet cisterns must—

  1. have a dual flushing mechanism; and
  2. be a minimum 4 Star WELS rating discharging not more than 4.5 litres for a full flush; and
  3. are compatible with the size of the toilet bowl to allow for proper functioning of the toilet.

For all other installations, cisterns or flushing devices for water closets must—

  1. have a dual flushing mechanism; and
  2. be a minimum 3 Star WELS rating discharging not more than 6 litres or 4.5 litres for a full flush.