Monthly Archives: May 2024

Expansion vessels are crucial for maintaining a constant and adequate water pressure level within a drinking water or heating system. These vessels look just like small water tanks and are also known as expansion tanks. Within these vessels is a rubber diaphragm, the function of which is to keep the compressed air and the water from the system apart.

Expansion vessels can be either potable or nonpotable. Potable expansion vessels are used in drinking water systems and must meet stringent standards around cleanliness. Non-potable vessels are used within heating systems where water is not suitable for drinking.

When water is heated, it expands. The expansion vessel is designed to deal with this and gives the extra water volume somewhere to go. Without this, pressure would build and build, and the system pipes could potentially burst. Any appliances that are plumbed into the system