The Worcester Bosch 87161425000 Expansion Vessel is a genuine replacement pressure-management component designed to maintain stable water pressure within your central heating system. As your boiler heats water, the volume expands; this expansion vessel absorbs the resulting increase in volume and pressure, helping to prevent stress on pipework, seals, pumps and valves. A properly functioning expansion vessel also helps reduce the frequency of low-pressure faults, ensures more even heat delivery and supports quieter, more efficient boiler operation.

This 10-litre expansion vessel is compatible with Worcester Bosch CDi and SBi series boilers that specify part number 87161425000 in their technical documentation. To ensure correct fitment and dependable performance, always verify that the part number matches your existing vessel or consult your boiler’s service information before installation, as vessel sizes and capacities can differ between models and system configurations.

Supplied ready for direct replacement, the 87161425000 Expansion Vessel connects to the boiler’s internal pressure line and appropriate mounting point without modification when installed by a qualified engineer. Choosing this genuine Worcester Bosch component helps restore proper pressure balance, supports efficient heat distribution and contributes to reliable, trouble-free heating and hot-water performance in compatible CDi and SBi boilers.