: It aligns with HSE's HSG274 Part 2 to manage the risk of Legionnaires' disease. This includes maintaining hot water temperatures above 50°C at outlets and avoiding "dead legs" where water can stagnate.
Materials must not degrade water quality or encourage microbial growth. Components must comply with the Water Regulations Approval Scheme (WRAS) or equivalent standards. Copper, stainless steel, and specific multilayer plastics are commonly used for hot water distribution due to their thermal resistance. Insulation
You may encounter public previews, such as the "Cjn-bs-8558-2011presentationfeb13.pdf", which is a 57-page presentation that offers an overview but is not the full standard. Additionally, archived "draft for comment" documents (e.g., 11/30228295 DC) may appear online, but these are historical working drafts, not the final published standard, and should never be used for compliance. Using drafts or previews for design or auditing purposes represents a significant professional risk. bs 8558 pdf hot
Hot water in calorifiers or cylinders should be stored at 60°C or higher.
With the Building Regulations Approved Document G imposing a mandatory water consumption limit of 125 litres per person per day for new dwellings, designers must rely on accurate sizing guidance to achieve these efficiencies. BS 8558 provides the technical guidance needed to meet these legal requirements. : It aligns with HSE's HSG274 Part 2
Before diving into the details of the standard itself, it's important to understand the legal and safety context around obtaining a copy.
BS 8558 exists to prevent common water system failures like stagnation, contamination, and bacterial proliferation. It addresses key areas including temperature control for Legionella prevention, flushing and disinfection procedures for new or altered systems, and record-keeping for compliance and assurance. It also covers the design of underground pipework within the curtilage of a building, an area often overlooked in general specifications. Components must comply with the Water Regulations Approval
Temperature control is the primary defense against bacterial growth in domestic water systems. BS 8558 outlines specific temperature thresholds that must be met at various points in the system: 1. Storage Temperature (The Calorifier/Cylinder)
The keyword "hot" captures the standard's relevance to several critical, high-stakes areas of building management:
