Worcester Bosch Heat Exchanger Greenstar 87154069500

The Worcester Bosch 87154069500 is a heat exchanger used across the Greenstar range of combi and condensing boilers. It sits at the centre of the appliance's water circuit, moving heat from the combustion side into the domestic hot water and central heating system. As a serviceable component it is replaced when performance drops, when the primary circuit becomes restricted, or when the unit is stripped down for a major repair.

• Domestic hot water runs cooler than the setpoint, or temperature fluctuates between draws
• Boiler locks out or cycles repeatedly once the appliance reaches working temperature
• Kettling, banging or gurgling noises from the heat exchanger during firing
• Visible scale, sludge or corrosion deposits on the exchanger body or connections
• Water weeping from the exchanger seams, seals or pipe unions

• Check the GC number and serial plate on the appliance against the compatibility list to confirm the correct variant
• Compare any previous part number on the old component with the alternative numbers listed below
• Inspect the seals and gaskets on removal and order replacements if they are disturbed during the swap
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.