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The expansion vessel is a vital component in sealed heating systems, designed to accommodate the thermal expansion of water as it heats up. By absorbing excess pressure, it protects the boiler and plumbing from overpressure damage. This vessel is typically pre-charged with air and features a diaphragm that separates the air and water chambers. When the system pressure rises, the diaphragm compresses, allowing the water to expand safely. Over time, expansion vessels may lose their charge or develop leaks, requiring replacement to maintain system efficiency and safety. Choosing the correct size and type of expansion vessel is important for your specific heating system. This spare part is essential for any boiler maintenance or repair project.