Guidance to paragraph 15(1)
In this paragraph reference to devices includes backflow protection arrangements.
Guidance to paragraph 15(2)
Thermal expansion from unvented water heaters (with the exception of instantaneous water heaters with a capacity less than 15 litres) may be accommodated within the secondary hot water system. However this is only allowed if:
The expanded water does not increase the temperature of the water in the supply pipe to in excess of 25°C in England and Wales 20°C in Scotland and Northern Ireland. As this may result in waste or impact on wholesomeness.
Both the expanded water plus any displacement can be accommodated within the supply pipe. It is not permissible for water displaced as a result of accommodating expansion to backflow into the pipework owned by the local water undertaker.
Guidance to paragraph 15(3)
The lowest level of backflow protection required as point of use protection must have a backflow protection rating which is at least equivalent to the highest fluid category of any downstream fluids an installation will be subjected to.
Guidance to paragraph 15(4)
Where a water undertaker considers there to be a likelihood, which cannot be reasonably ignored, of contamination by backflow within a premises or the wider network they can require additional backflow protection. In some circumstances as an alternative to this a higher level of point of use backflow protection may be permitted.
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