Wet radiator valve power unit

Key features

  • 1A switching capacity
  • Silent switching
  • 230V AC at 50Hz
  • Terminal connections mains -
    • Earth ()x2
    • Neutral (N) x2
    • Live in (LIVE)
  • Load output (LOAD)
  • Standard 2 gang Fitment
  • 2mm² to 4mm² Mains & LV terminal capacity
  • Power and active LEDs
  • LV quick connector
  • Mains Borne Signalling technology
  • Silent proportional valve operation
  • 5-year warranty


The Prefect Irus PRE2000PUR power unit provides SELV voltage and 1A silent switching capacity to the PRE2000CU3.

The PRE2000PUR power unit supplies the PRE2000CU3 head unit with the necessary power while adding the capability to switch up to 1A loads silently. The PUR utilises a solid state triac in place of a relay. the triac has no mechanical parts, therefore it is very reliable while being completely silent in operation, this is an important feature when controlling proportionally as the unit will switch multiple times per minute to maintain temperature levels.

The PUR sends and receives the CU3 data via mains borne signalling (MBS).

The PUR is a standard 2 gang fitment requiring a 35mm or greater surface or sunken box. The Fascia incorporates two flex cable clamps and associated knock-outs for flex connections to TRV valves.

The PUR fascia is moulded in PC/ABS making it extremely durable, the material is also UV stable and will not discolour over time.

The PUR includes active and power LED’s for easy identification of status.

Twin earth and neutral terminals along with ample wiring room increase the ease of installation and safety. The LV terminal is removable allowing for easy installation and if needed product replacement.

A RJ45 connector is available for a quick non wiring connection to a PRE2000SR slave relay unit affording the PUR the use of a relay, giving the PUR and CU3 complete control of a room with multiple Radiators.


Product Information


Wiring Diagram - Standard wet heating

Wiring Diagram - Multiple radiator connection

Wiring Diagram - CU3 Pulse metering

Wiring Diagram - CU2 Pulse metering

Wiring Diagram - Wet heating

Wiring Diagram - Wet heating and water heating

Wiring Diagram - Typical wet radiator layout