Worcester Bosch Heat Exchanger Assembly HE12/25-OOO Painted 87161078380

The Worcester Bosch 87161078380 is a painted heat exchanger assembly supplied as a complete unit for the Greenstar Danesmoor HE 18/25 family of boilers. It is the primary component that transfers heat from the combustion process into the appliance water circuit, so its condition directly affects how efficiently the boiler heats the system and the domestic hot water. The assembly is supplied painted and is identified by Worcester Bosch part number 87161078380.

• Water weeping, damp patches or corrosion staining around the heat exchanger body or its connections
• Kettling, banging or rumbling noises during a heating or hot water cycle
• Reduced heat output or slow warm-up with the burner otherwise running normally
• Repeated overheat trips or lockouts that clear once the appliance cools
• Visible scale, pitting or distortion on the exchanger surfaces during a service inspection

• Confirm the boiler model and serial number against the compatibility list before ordering, as the same appliance family uses several variants.
• Check the part number on the existing exchanger against 87161078380 and the alternative number 1030045.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
• Seals and gaskets disturbed during removal are normally renewed at the same time, so have the correct items to hand before starting work.