Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Horstmann Zoneplus 28mm 2 port zone valve Z228 XL

Horstmann Controls

Horstmann Zoneplus 28mm 2 port zone valve Z228 XL

Horstmann Zoneplus Z228 XL 28mm two-port motorised zone valve with spring-return actuator, for central heating zone control.

At a glance

  • Also known as 4210120
Manufacturer part no.
Z228 XL
Showing prices

£135.71

£113.09 ex. VAT · VAT at 20%

Available to order · 1 working day
Available to order · 1 working day
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 Horstmann Z228 XL is a 28mm two-port motorised zone valve from the Zoneplus range. It regulates water flow to a heating zone using a Class F synchronous motor in a removable actuator, and returns to closed by spring when de-energised.

Signs this part needs replacing

  • Valve stuck open or closed, so the zone won't heat or won't stop heating
  • Motor humming but the valve not moving
  • Actuator overheating or a smell of burning
  • Manual override lever no longer returns the valve to closed

Before you order

  • Isolate the electrical supply before removing the actuator
  • Drain down the local pipework before disconnecting the valve body
  • Check whether you need the body, the actuator head, or both
  • Confirm 28mm pipe size before ordering

Not sure which part?

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