Worcester Bosch 20 Plate Heat Exchanger – Refurbished | Part No. 87161082120

The plate heat exchanger is one of the hardest-working components inside a combination boiler. Every time a hot tap is opened, it transfers heat from the primary circuit to the domestic hot water circuit almost instantaneously — cycling through thousands of thermal events across a boiler's lifespan. Over time, limescale accumulation, thermal fatigue, and minor internal leaks gradually reduce its efficiency until hot water delivery becomes inconsistent, flow rates drop, or the boiler starts throwing fault codes. The Worcester Bosch 20 Plate Heat Exchanger (Part No. 87161082120 / 448435) is the exact replacement required to restore full heating and hot water performance to your Worcester Bosch combination boiler.

This is a professionally refurbished genuine Worcester Bosch component. Each unit undergoes a thorough inspection, deep cleaning, and pressure testing process before being verified against original manufacturer specifications — giving you OEM-grade reliability without the new-part price tag. The 20-plate design provides an efficient heat transfer surface area, ensuring rapid and consistent hot water delivery exactly as the boiler was originally engineered to deliver. It fits directly into place with no modifications required, making for a clean, straightforward installation.

Compatible Worcester Bosch Models

Refurbished to OEM Standards. BSI Certified. Warranty Included.

Every unit in our refurbished range is processed by a trusted, BSI-certified refurbishment partner — meaning quality control is independently verified, not just self-assessed. This heat exchanger meets the same performance benchmarks as a new part, restoring efficient heat transfer between your boiler's primary and hot water circuits and eliminating the inefficiencies caused by a degraded or blocked original unit. Supplied with a full 12-month guarantee, it represents a dependable, cost-effective solution for both homeowners and Gas Safe registered engineers handling boiler repairs.

Delivery & Returns

Orders placed before 3:00 PM are dispatched the same working day. Both standard and next working day delivery options are available at checkout. Returns are accepted within 30 days, provided the item is unused and in its original condition and packaging.

Note: Please confirm that part number 87161082120 or 448435 matches your existing component before ordering. All installation work must be carried out by a Gas Safe registered engineer to ensure safety compliance and to maintain warranty validity.