The Baxi 235885 Expansion Vessel Extension is a genuine replacement component designed to support your boiler’s pressure management system by extending the connection to the expansion vessel. In a pressurised central heating system, the expansion vessel absorbs increases in water volume and pressure as the system warms up. When the connection to this vessel is incorrect, restricted or deteriorated, it can lead to unstable system pressure, frequent auto-bleeding, pressure faults or pump stress. The expansion vessel extension helps ensure the correct hydraulic link and clearance for the vessel to perform effectively.

This extension is compatible with Baxi boilers and systems that specify part number 235885 in their parts documentation. To ensure correct fitment and reliable operation, always verify the part number on your existing component or consult your boiler’s service information before installation, as expansion vessel connections and mounting formats vary between models.

Supplied ready for direct replacement, the 235885 Expansion Vessel Extension integrates with the boiler’s existing pipework and mounting points when installed by a qualified engineer. Choosing this genuine Baxi component helps maintain stable system pressure, supports efficient heat distribution and contributes to dependable heating performance in compatible boilers.