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Worcester Bosch Flue Pipe (Bottom) 87186509870

Worcester Bosch

Worcester Bosch Flue Pipe (Bottom) 87186509870

Bottom flue pipe section for Worcester Bosch Greenstar 2000 and 4000 combi and system boilers.

At a glance

  • Appliance family: Worcester Greenstar 2000 and Greenstar 4000
  • Also known as 1038241
Manufacturer part no.
87186509870
Showing prices

£36.97

£30.81 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The flue pipe (bottom) is a Worcester Bosch flue component, manufactured under part number 87186509870. It forms the lower section of the flue run on Greenstar 2000 and Greenstar 4000 combi and system appliances. Its function is to carry products of combustion away from the boiler and, in condensing appliances, to manage the return of condensate within the flue assembly.

Signs this part needs replacing

  • Visible corrosion, perforation or deformation of the flue pipe section
  • Condensate leakage or staining around the lower flue joint
  • Deteriorated or missing seals at the pipe connection
  • Flue gas escape detected during combustion analysis or a flue integrity check
  • Physical damage to the flue pipe following impact or disturbed flue route

Before you order

  • Confirm the appliance model against the fitment list above before ordering
  • Check the model and GC number on the appliance data badge
  • Verify that the bottom flue pipe is the section requiring replacement
  • Inspect the remainder of the flue assembly for any further damaged sections

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.