BS 8558:2015 is the British Standard entitled "Guide to the design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages." Developed by the British Standards Institution (BSI), it provides complementary guidance to the European BS EN 806 series of standards. Together, these documents form the backbone of modern plumbing practice in the UK, covering the entire lifecycle of a hot and cold water system, from initial design and material selection to long-term operation and maintenance.
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BS 8558 covers several technical aspects essential for a high-performing hot water system: BS 8558:2015 is the British Standard entitled "Guide