When designing a compliant plumbing system a number of factors need to be considered, including but not limited to:
Avoiding the risk of contamination or damage resulting from the environment in which the system is to be installed or due to the design itself.
The required and attainable supply pressure and other operational parameters
User expectations and whether these are achievable
Suitability of water fittings for use
Providing appropriate, adequate backflow protection.
Water efficiency
Limiting waste.
Useful sources of information include BS EN 806, and BS 8558No water fitting shall be installed in such a position, or pass through such surroundings, that it is likely to cause contamination or damage to the material of the fitting or the contamination of water supplied by the water undertaker or water licensee.
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