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Worcester Bosch Mixing Unit 8716117259

Worcester Bosch

Worcester Bosch Mixing Unit 8716117259

Mixing unit for Worcester Bosch Greenstar 9i and 12i ErP System boilers, for NG and LPG models.

At a glance

  • Also known as 1031275
Manufacturer part no.
8716117259
GC number
J25-320
Showing prices

£12.37

£10.31 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 8716117259 is a mixing unit for Worcester Bosch Greenstar 9i and 12i ErP System boilers. It forms part of the boiler's hydraulic circuit, where it blends water to help maintain stable operating temperatures.

Signs this part needs replacing

  • Fluctuating domestic hot water temperature
  • Boiler cycling or overheating
  • Unusual noise from the mixing unit area
  • Visible leaks or scale around the unit

Before you order

  • Check your boiler model and GC number against the fitment list.
  • Confirm the part number 8716117259 matches your existing component.
  • Verify whether your boiler uses natural gas (NG) or LPG.

Not sure which part?

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