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Honeywell T9001 Thera-2 Radiator Thermostat

Honeywell

Honeywell T9001 Thera-2 Radiator Thermostat

Honeywell T9001 Thera-2 radiator thermostat head for wet central heating systems, used to regulate heat output at the radiator.

At a glance

  • Also known as 4200570
Manufacturer part no.
T9001
Showing prices

£34.92

£29.10 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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 Honeywell T9001 Thera-2 is a radiator thermostat from Honeywell. It forms part of a thermostatic radiator valve assembly, acting on the valve body to regulate the flow of water through the radiator and control room temperature. It sits within the radiator valves and accessories group of wet central heating components.

Before you order

  • Identify the valve body already fitted and confirm it accepts a Honeywell Thera-2 head, as the head must match the body it mounts to.
  • Check the mounting arrangement and thread of the existing head before removal, so the replacement can be fitted without adaptors.
  • Confirm whether the head alone is being replaced or whether the valve body is also due for renewal on the same radiator.
  • Isolate the heating system and follow normal site practice before removing an existing thermostatic head.

Not sure which part?

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