: Hot water inside storage cylinders or calorifiers must be heated to, and stored at, a minimum temperature of 60°C to rapidly kill Legionella bacteria.
BS 8558 acts as a national companion document to the European standard BS EN 806. While BS EN 806 dictates the overarching requirements for water installations, BS 8558 offers specific, practical practices tailored to UK regulations, infrastructure, and environmental conditions.
: BS 8558 emphasizes the "hot" in hot water. To prevent the growth of Legionella bacteria, hot water should be stored at 60°C and distributed so that it reaches at least 50°C (55°C in healthcare environments) within one minute at the outlets.
: To maintain the required temperatures and improve energy efficiency, the standard details the necessary insulation thickness for both flow and return pipework. bs 8558 pdf hot
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: Recommended materials for hot supply lines include copper (due to natural antibacterial properties), stainless steel, and specific high-temperature plastics like PEX.
: In recirculating systems, the return temperature to the calorifier (water heater) should not be less than Legionella Control International Guidance on Design & Maintenance : Hot water inside storage cylinders or calorifiers
Understanding BS 8558: Guidance for Hot and Cold Water Services
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For those focusing on "hot" water applications, BS 8558 offers critical guidance on: BS 8558:2015 - TC | 30 Sep 2015 - BSI Knowledge : BS 8558 emphasizes the "hot" in hot water
Temperature is the primary weapon against microbiological contamination.
When designing hot water services under BS 8558, several engineering principles must be integrated: