Annex B of the outlines explicit mathematical criteria for sizing hot water storage systems. Over-sizing creates extended thermal stagnation zones, which lower systemic energy efficiency and encourage bacterial biofilms to build up. Conversely, under-sizing leads to systemic supply failures during peak loads. Sizing must be precisely scaled based on:
Are you dealing with a (calorifier/cylinder) or point-of-use heaters ?
is a British Standard that provides detailed, complementary guidance to the BS EN 806 series , which focuses specifically on the specification for installations inside buildings conveying water for human consumption. While BS EN 806 provides the "shall" requirements, BS 8558 offers the "how-to" guidance, covering the full life cycle of domestic water services—from design and installation to operation and maintenance. Status: Current (Second edition published September 2015).
for full compliance in the UK. How to Access BS 8558 PDF and Related Documents bs 8558 pdf hot
≥55∘Cis greater than or equal to 55 raised to the composed with power cap C in high-risk areas). 2. Preventing Stagnation and Dead Legs
A primary goal of BS 8558 is minimizing risks associated with dormant water.
A system designed perfectly on paper can still fail if it is not commissioned and maintained correctly. BS 8558 outlines strict protocols for putting hot water systems into service. Flushing and Disinfection Annex B of the outlines explicit mathematical criteria
BS 8558 acts as "complementary guidance" to the series. While the BS EN 806 standards provide the technical requirements for water installations across Europe, BS 8558 provides the specific UK context and detailed practical advice needed to meet those requirements.
The most critical section of BS 8558 involves the management of hot water temperatures. This is a balancing act between preventing bacteria growth and preventing physical burns.
To ensure you have the most accurate and up-to-date guidance, it is recommended to obtain the directly from authorized providers: Sizing must be precisely scaled based on: Are
If you are designing, installing, or maintaining a domestic water system, you need to reference BS 8558. It is officially titled Guide to the design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages . As a complementary guide to the European BS EN 806, it provides practical, UK-specific advice that applies to everything from pipework layouts to system commissioning.
The system should be checked for signs of corrosion or failure in insulation. Accessing the BS 8558 PDF