Expansion Vessels

The expansion vessel is an essential component that protects your heating system from pressure damage caused by thermal expansion.

As water heats up, it expands and increases in volume. The expansion vessel absorbs this excess pressure via a flexible internal diaphragm or bladder, maintaining safe, stable system pressure and preventing strain on pipes, joints, and the boiler itself.

A failing or waterlogged expansion vessel can cause noticeable problems, including frequent pressure loss on the gauge, the pressure relief valve discharging water, the boiler locking out due to low or high pressure, or noisy pipework.

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