Expansion Vessels

Shop high-quality boiler expansion vessels from trusted brands at Toolstation. Find products in various sizes and configurations, from 5L potable expansion vessels to 25L external expansion vessels.

What Are Boiler Expansion Vessels Used For?

A boiler expansion tank is an essential component of any central heating system, helping to regulate pressure. They are found in most domestic boiler systems and all combi boilers. Expansion vessels contain air and water to counteract changes in pressure as water is heated and cooled, keeping your boiler safe and working efficiently. Like overflow tanks, they allow excess nitrogen and water to escape from the central heating system.
                                  Zilmet Zilmet Expansion Vessel 18L - 64278 - from Toolstation ( 42 )
                                  64278 Expansion Vessel 18L
                                  £41.98
                                  ex. VAT £34.98
                                  Each

                                  • 1.5 bar pre-charged • Epoxy paint protection • WRC ...Read more

                                  Zilmet Zilmet Expansion Vessel 12L - 70204 - from Toolstation ( 42 )
                                  70204 Expansion Vessel 12L
                                  £43.98
                                  ex. VAT £36.65
                                  Each

                                  • 1.5 bar pre-charged • Epoxy paint protection • WRC ...Read more

                                  Zilmet Zilmet Expansion Vessel 8L - 29704 - from Toolstation ( 13 )
                                  29704 Expansion Vessel 8L
                                  £39.18
                                  ex. VAT £32.65
                                  Each

                                  • 1.5 bar pre-charged • Epoxy paint protection • WRC ...Read more

                                  Expansion Vessel Control Kit  - 49934 - from Toolstation ( 7 )
                                  Zilmet Zilmet Expansion Vessel 25L - 72473 - from Toolstation ( 42 )
                                  72473 Expansion Vessel 25L
                                  £51.88
                                  ex. VAT £43.23
                                  Each

                                  • 1.5 bar pre-charged • Epoxy paint protection • WRC ...Read more

                                  Zilmet Zilmet Expansion Vessel Potable 5L - 41665 - from Toolstation ( 3 )

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