The Worcester Bosch 87161425030 mini expansion vessel (Ha50) is a genuine OEM pressure-management component designed to regulate and absorb thermal expansion in compatible Worcester Bosch 24i and 28i boiler installations. As the water in a closed central heating system heats up, its volume increases; the expansion vessel’s internal diaphragm accommodates this increased volume, helping prevent excessive pressure rise that can lead to fault codes, safety valve discharge or premature wear on system components. Built to original equipment standards, it delivers dependable pressure stability in smaller output boiler systems.

This mini expansion vessel is compatible with Worcester Bosch 24i and 28i boilers that specify part number 87161425030 for Ha50 pressure management. Because expansion vessel sizing and connection requirements vary by model, system configuration and installation type, it’s recommended to confirm suitability using your boiler’s exact model number and GC number before purchase.

Key features of the Worcester Bosch 87161425030 mini expansion vessel (Ha50) include its genuine Worcester Bosch construction for assured quality and fit, appropriately sized 50 L expansion capacity for the demands of 24i and 28i systems, internal diaphragm design to manage thermal expansion and stabilise system pressure, robust pressure-rated body suited to routine heating system loads, and reliable performance when installed by a qualified heating engineer to help maintain safe and efficient boiler operation.