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Copper indirect cylinders for domestic purposes - Open vented copper cylinders. Requirements and test methods Ingestion-build-209418 BS 9222 also makes recommendation1 Scope This part of BS 1566 specifies requirements for open vented, vertically mounted copper cylinders for the storage of hot water where the water is either heated indirectly by primary (boiler) water circulating in an integral primary heater and or directly via either an external heat source or an electric immersion heater fitted inside the cylinder.