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Worcester Bosch Burner Seal WB 5 II Plus 87186680640

Worcester Bosch

Worcester Bosch Burner Seal WB 5 II Plus 87186680640

Worcester Bosch burner seal (87186680640) for Greenstar 8000 Life Combi and other Worcester appliances, giving an airtight burner joint.

At a glance

  • Part type: Gaskets, seals and washers
  • Also known as 2249280
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87186680640
Showing prices

£59.80

£49.83 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 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

This is a Worcester Bosch burner seal, supplied under part number 87186680640 and listed by the manufacturer as the seal for the WB 5 II Plus CMS 42kW burner assembly. It sits at the burner joint and forms an airtight, gas-tight barrier that keeps combustion products where they belong and protects the combustion reading from being disturbed by unwanted air.

The seal is a service item rather than a permanent component. Heat cycling, condensate exposure and the simple passage of time harden the material, so it is normally renewed whenever the burner is removed for inspection, cleaning or repair.

Signs this part needs replacing

  • A smell of combustion products or flue gases around the burner area during or after firing
  • Soot deposits, discolouration or heat marking around the burner joint
  • An unstable or noisy flame, or combustion readings that will not settle within tolerance
  • A seal that has hardened, flattened, cracked or torn when the burner is removed
  • Visible deformation or compression set where the seal meets its mating face

Before you order

  • Check the appliance GC number and serial plate against the compatibility list, as the same appliance name can cover several build variants.
  • Confirm the alternative number 2249280 matches the part currently fitted before ordering.
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

Not sure which part?

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