Central heating system

Expansion vessel for central heating systems

At some point, the well-known separate vessels in or next to a central heating boiler may break down, as a result of which the boiler stops working optimally. If the expansion vessel is defective, this will be obvious from the pressure shown on your central heating system. Pressure is usually shown by means of a pressure gauge that is installed close to the expansion vessel. Generally, the pressure on your central heating system will be 1.5 to 2 bar. When it is lower than 1.5 bar, it is very likely that the expansion vessel is broken.

Replacing an expansion vessel is very simple, which you can easily do yourself. Please follow the next steps:

  • Close the inlet cock
  • Unscrew and remove the current expansion vessel
  • Place the new expansion vessel
  • Open the inlet cock

An18-litre expansion vessel is the most commonly used model for a central heating system.