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Worcester Bosch Silencer Body 871861745A0

Worcester Bosch

Worcester Bosch Silencer Body 871861745A0

Worcester Bosch 871861745A0 silencer body for the diverter valve and hydraulics assembly on Greenstar combi and system boilers.

At a glance

  • Part type: Diverter valves and hydraulics
  • Also known as 1030871
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
871861745A0
GC number
J04-447
Showing prices

£13.54

£11.28 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 871861745A0 silencer body is a hydraulic component that forms part of the diverter valve and hydraulics assembly on Greenstar boilers. It sits in the water circuit and damps the noise produced as water moves through the diverter valve, helping to keep operating sound levels steady during hot water and heating demand. It is catalogued by Worcester Bosch under the diverter valves and hydraulics part group.

Signs this part needs replacing

  • Whistling, humming or droning from the hydraulic block when hot water is drawn
  • A noticeable rise in operating noise from the diverter valve area
  • Water weeping or staining around the hydraulic assembly
  • Vibration carried through the boiler casing while the appliance is running
  • Scale or debris found in the silencer body when the hydraulic block is stripped down

Before you order

  • Check the appliance GC number and serial number against the compatibility list before ordering.
  • The alternative number 1030871 may appear on older documentation for the same component.
  • Inspect the seals and gaskets in the hydraulic block while it is apart and renew any that are worn.
  • 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.