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Frequently Asked Questions

• What does an expansion vessel do to a hot water tank?

  The expansion vessel gives the additional hot water a sort of overflow tank, that can help to bring the pressure in the system back to a normal level. Acting like a spring, the air that is present in the vessel compresses. In this way, it absorbs the extra pressure, helping to keep the system stable.

• What does an expansion vessel do in a combi boiler?

  If you have a combi boiler, you will have an expansion vessel. This vessel contains air and water from the central heating system, and its purpose is to maintain the right level of pressure in the system. There are various expansion tank designs, but the most common among modern boiler designs is the bladder type system.

• How long can an expansion vessel be used for?

  Only boiler engineers registered with the GSR are legally allowed to carry out maintenance on a heating system. Always call a professional if you need to replace or fix a boiler system. An expansion vessel should last between 5-10 years.

• What can cause an expansion vessel to fail?

  An expansion vessel can fail due to rust and subsequent water leakage, although this is unlikely in most modern sealed water heating systems. It is more common for the diaphragm to become thinner and perforate over time, causing the whole system to fail.