The Worcester Bosch 87161157400 heat exchanger assembly is a genuine OEM primary heat exchanger specifically engineered for compatible Worcester Bosch Greenstar and Junior boilers within the 18–24 kW output range. As a core component of the boiler’s thermal system, this heat exchanger transfers heat from the burner to the central heating and hot water circuits, ensuring effective heat distribution, responsive temperature control, and consistent performance. Manufactured to original equipment standards, it is built to withstand regular thermal cycling, deliver long-lasting durability, and help maintain optimal boiler efficiency when replacing a worn or failed exchanger.

This heat exchanger assembly is compatible with selected Worcester Bosch Greenstar and Junior boiler models rated between 18 kW and 24 kW that specify part number 87161157400. Because compatibility can vary by model variant, production year, and configuration, it’s recommended to confirm fit using your boiler’s exact model number and GC number prior to purchase.

Key features of the Worcester Bosch 87161157400 heat exchanger assembly include its genuine Worcester Bosch construction for assured quality and fit, efficient thermal transfer to support central heating and hot water production, robust design engineered to resist thermal stress and corrosion over time, precise integration into the boiler’s combustion and hydronic circuits, and dependable operation when installed by a qualified Gas Safe heating engineer.