What is an expansion vessel?

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Expansion vessel is a vessel that serves to balance changes in volume of liquid beyond which temperature may change. It acts as an overpressure regulator in the system. Expansion vessels are commonly used in heating and solar systems and can also function as part of drinking water circuits. Expansion vessels are divided into open and closed. The open ones are placed at a sufficient height above the pipeline, for example on the ground. Today, however, it is an obsolete solution. Closed expansion vessels are more modern and are used, for example, in the return pipe or pump. This degrades pressure in the system.