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Worcester Bosch Pump Assembly Three Speed 8716120409

Worcester Bosch

Worcester Bosch Pump Assembly Three Speed 8716120409

At a glance

  • Part type: Pump assembly, three speed
  • Also known as WB8716120409, 1011008, N9329-1
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
8716120409
GC number
H02-527
Showing prices

£238.42

£198.68 ex. VAT · VAT at 20%

In stock
Order within 15h 22m for same-day dispatch
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Worcester Bosch 8716120409 is a three speed pump assembly used in Worcester Bosch Greenstar gas appliances. It circulates heating water around the primary circuit, maintaining flow through the heat exchanger and out to the radiators. Speed selection allows the flow rate to be matched to the system, which helps the appliance run steadily across different load conditions.

Signs this part needs replacing

  • No heating or hot water, with the appliance failing to fire or locking out
  • The pump runs hot, seizes or is silent when it should be running
  • Grinding, humming or rattling noise from the pump housing
  • Radiators staying cold or heating unevenly despite the boiler firing
  • Repeated overheat or flow-related fault codes on the appliance display

Before you order

  • Check the GC number and appliance serial plate to confirm the pump assembly matches your model
  • Compare the numbers on the existing pump against the alternative and previous numbers listed here 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?

Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.