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Worcester Bosch Throttle 87133060530

Worcester Bosch

Worcester Bosch Throttle 87133060530

Worcester Bosch 87133060530 throttle for the burner and burner controls assembly on Greenstar combi boilers, also listed as 1020846.

At a glance

  • Part type: Diverter valves and hydraulics
  • Also known as 1020846
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87133060530
GC number
798-749
Showing prices

£57.19

£47.66 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

The Worcester Bosch 87133060530 is a throttle that sits within the burner and burner controls group of the appliance. It is used to regulate gas flow through the burner circuit, allowing the engineer to set the appliance to the correct combustion figures during commissioning and routine servicing. It is a Worcester Bosch spare intended for the Greenstar range of gas combi boilers, including the British Gas badged variants of those models.

Because it forms part of the gas-carrying side of the boiler, correct fitment and setting have a direct effect on flame stability, modulation and the readings taken at the flue analyser.

Signs this part needs replacing

  • Burner pressure that cannot be set, or that drifts away from the commissioned figure
  • Combustion readings that move between services without any other change to the appliance
  • An unstable or uneven flame picture, or poor modulation across the output range
  • Repeated lockouts or ignition faults traced back to the burner controls assembly
  • Domestic hot water temperature that fluctuates when a tap is run

Before you order

  • Check the GC number on the appliance data badge against the compatibility list to confirm the model.
  • Confirm the part number 87133060530, or the alternative number 1020846, matches the item being replaced.
  • 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.