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Pumps & Pressurisation > Expansion Vessels
Expansion vessels are water storage tanks which protect heating and hot water systems from excessive pressure, as the system pressure builds as the water is heated. Within a pressure vessel is a rubber diaphragm (membrane) behind which a volume of air is contained, on the other side of the membrane is the system water. As the water heats and expands, the air is compressed, allowing the system pressure to safely increase within risk of burst pipework or appliances.
PHC stock a comprehensive range of different expansion vessels for heating, potable water and high temperature solar applications. We carry vessels from leading manufacturers including Zilmet, Aquasystem, Reliance Water Controls, Varem, Watts, Cimm and more. We also supply expansion vessel parts and accessories including replacement membranes, sealed system kits, mounting brackets, schrader valves and valve removal tools, connection hoses and fittings, manual and electric expansion vessel pumps and pressure hoses.
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