The Worcester Bosch 87161164860 Air/Gas Mixing Chamber Assembly is a genuine replacement component designed to combine the incoming combustion air with gas in the correct proportions before delivery to the burner. This mixing chamber ensures a consistent, optimised fuel-to-air ratio that supports smooth ignition, stable combustion and efficient heat output. A well-functioning mixing chamber contributes to clean burning, reduced emissions and dependable boiler performance, while wear or damage can lead to misfires, poor flame quality or boiler lockouts.

This air/gas mixing chamber assembly is compatible with Worcester Bosch Ri and Greenstar series boilers that specify part number 87161164860 in their internal parts documentation. To ensure correct fitment and reliable operation, always check the part number on your existing assembly or refer to your boiler’s service information before installation, as combustion system designs can vary between models and configurations.

Supplied ready for direct replacement, the 87161164860 Air/Gas Mixing Chamber integrates with the boiler’s existing combustion air inlet, gas supply and burner connections without modification when fitted by a qualified engineer. Choosing this genuine Worcester Bosch component helps restore proper air-to-gas blending and supports efficient, reliable operation in compatible Ri and Greenstar boilers.