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This Heating Expansion Vessel with a replaceable membrane 3/4" and brackets is ideal for a heating system to allow the expansion that occurs when heating water. The volume of water increases by approximately 4.5% when being heated from 0C to 100C. When water temperature increases, the vessel's internal membrane expands so that water can fill the vessel. The membrane will expand until the system reaches its maximum temperature.Features & Benefits: RWC Heating Vessels With Brackets 1.0 Bar - 8l, Replaceable membrane, Includes brackets, Accommodates expansion from heated water, Useful for heating systems. RWC Heating Vessels With Brackets 1.0 Bar - 8l Reliance Water Controls (RWC) XVES100035