Worcester Bosch DHW Plate Heat Exchanger 87161066860 (12-Plate*)

Genuine Worcester Bosch OEM secondary (DHW) plate heat exchanger for Greenstar/CDi boilers. This compact plate pack transfers heat from the primary circuit to your tap water for fast, stable hot water performance.

• Manufacturer: Worcester Bosch
• Part type: Plate heat exchanger DHW/secondary
• MPN: 87161066860
• GTIN / EAN: 4010009876144
• GC number: H02-530
• Plate count: Historically 12-plate; many current OEM supplies are 10-plate but fully compatible*
• Kit contents: Often supplied with new seals, screws & clips (check your pack)

Compatible boilers (examples)

Used across multiple Greenstar and CDi families (variant/year dependent). Common fits include:

• Greenstar i System 12i / 15i / 18i / 24i
• Greenstar i Junior 24i / 28i (Combi)
• Greenstar i (ErP) 25i
• Greenstar Si 25Si / 30Si

Always confirm against your boilers data plate/parts list for MPN 87161066860.

What this part does

The DHW plate heat exchanger keeps boiler (primary) water separate from tap water while efficiently transferring heat, ensuring reliable hot water delivery.

When to replace

• Fluctuating or lukewarm hot water
• Poor flow due to internal blockage/scaling
• Confirmed internal leak or cross-contamination

What’s in the box

• 1 Worcester Bosch DHW plate heat exchanger 87161066860
• Seals/screws/clips (if included by supplier)

Installation & safety

Must be installed by a qualified Gas Safe engineer. After fitting, flush/clean the system as required, renew seals, and check DHW temperatures and operation.