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Shop Ariston expansion vessels for selected combi and system boiler models. The expansion vessel helps control pressure as heating water expands. Before ordering an Ariston boiler expansion vessel, confirm the full boiler model, GC number and part number printed on the existing vessel.
A faulty Ariston expansion vessel may cause boiler pressure to rise sharply when the heating is on, then drop again as the system cools. Other signs can include frequent repressurising, water discharging from the pressure relief valve or repeated pressure-related lockouts.
These symptoms can also result from a system leak, faulty pressure relief valve or pressure-sensor problem. Read our boiler expansion vessel problems guide for common symptoms and causes.
Expansion vessel testing and replacement should be completed by a suitably qualified engineer. Before ordering an Ariston replacement expansion vessel, compare the existing part number with the product listing and confirm the boiler model and GC number.
