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Worcester Bosch Central Heating Valve 87174052740

Worcester Bosch

Worcester Bosch Central Heating Valve 87174052740

Worcester Bosch 87174052740 central heating isolation valve for Greenstar Highflow appliances, controlling water flow in the heating circuit.

At a glance

  • Part type: Isolation valve
  • Also known as 1020057
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87174052740
GC number
H27-396
Showing prices

£45.10

£37.58 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 87174052740 is a central heating isolation valve manufactured by Worcester Bosch for use inside the appliance. It sits in the heating circuit and controls the flow of water through the relevant section of the boiler, allowing the circuit to be isolated when the appliance is serviced or a component is replaced. The valve is listed under the Valves General and Assembly spare part group and is fitted across the Greenstar Highflow range.

Signs this part needs replacing

  • Water weeping from the valve body, spindle or gland
  • Dripping that continues after the valve has been closed
  • Handle stiff, seized or turning without any change in flow
  • Valve will not shut off fully, so the circuit cannot be isolated for service
  • Corrosion, scale or staining around the valve connections

Before you order

  • Check the appliance GC number and serial plate against the compatibility list before ordering, as the same valve body is used across several Highflow variants.
  • Quote alternative part number 1020057 if the original number is not recognised on the appliance paperwork.
  • 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.