Worcester Greenstar Main Heat Exchanger – Refurbished | Part No. 87161157400

The main heat exchanger is the principal thermal component of a Worcester Greenstar condensing boiler — a precision-manufactured stainless steel assembly through which combustion gases transfer the majority of their heat energy into the primary water circuit. Failure or significant degradation of this component typically manifests as reduced heating output, repeated high-limit thermostat lockouts (often accompanied by an A fault code), abnormally high flue temperatures, or in more advanced cases, visible moisture contamination in the flue gas pathway caused by internal corrosion breaching the exchanger wall. The Worcester Greenstar Main Heat Exchanger (Part No. 87161157400) is the correct OEM replacement that fully restores primary thermal efficiency and safe combustion isolation.

This is a professionally refurbished genuine Worcester Bosch main heat exchanger. Each unit undergoes a comprehensive inspection — the stainless steel exchanger body, condensate tray, burner manifold connections, flow and return ports, and all associated seals and gaskets are examined and replaced as required. The assembly is then hydraulically pressure-tested at full working pressure to confirm complete structural integrity and leak-free performance at every connection point before dispatch. You receive the same thermal output and flue gas integrity as a new Worcester exchanger, at a considerably lower cost.

Compatible Boiler Models

OEM Quality. Proven Performance. Backed by Warranty.

Every refurbished Worcester main heat exchanger we supply is pressure-tested and performance-verified before dispatch. This 87161157400 unit restores full primary heat transfer and condensing efficiency on the Greenstar i range, resolves high-limit lockout faults associated with a degraded exchanger, and ensures combustion gases remain fully isolated from the heating circuit. Supplied with a full 12-month warranty.

Delivery & Returns

Orders placed before 1:00 PM (Mon–Fri) are dispatched the same working day, with standard (2–3 working days), next-day, and Saturday delivery options available at checkout. Returns are accepted within 30 days, provided the item is unused and in its original packaging.

Note: Please confirm that part number 87161157400 matches your existing heat exchanger before ordering. Main heat exchanger replacement must be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.