Rada 425-T3 C Thermostatic Mixing Valve

Rada 425-T3 C Thermostatic Mixing Valve

Rada Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type

  • BSI Kitemark

    BSI Kitemark

    Certificate type

A 1" surface mounted thermostatic mixing valve suitable for group shower applications.

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+44 (0)844 571 1777 www.radacontrols.com

A 1" surface mounted thermostatic mixing valve suitable for group shower applications.

General information

Uniclass 2015

Pr_40_20_87_81 Shower thermostatic water supply setsPrimary


S90/67 Thermostatic mixing valves

S90/680 Thermostatic mixing valves

Specification data - Shower thermostatic water supply sets

Product Reference

Rada 425-T3 C (1.1523.037)

Standard product features

Type 425-T3 C thermostatic mixing valve incorporates a Radatherm temperature sensor, check valves, filters and isolating ball valves and is supplied with 28 mm compression fittings.


  • Inlet: 1" BSP female or 28 mm compression fittings (adaptors supplied).
  • Outlet: 1" BSP female.
  • Standard connections are hot-left, cold-right, outlet-top, when facing the control.

Note: The outlet can be altered to bottom outlet if required, by repositioning the drain plug.


The temperature control knob allows the user to select the required temperature within the range available. An integral temperature stop limits the maximum temperature to a pre-set level and can only be reset by an authorised person (alternatively, the temperature knob can be locked in position after the desired temperature has been selected).

Flow control:

A separate flow control is required.

Temperature range:

  • Thermostatic control range: 25°C to 60°C.
  • Optimum thermostatic control range: 35°C to 46°C.
  • Minimum cold water temperature: 1°C.
  • Maximum hot water temperature: 85°C.

Pressure/ Flow rates:

  • Minimum dynamic supply pressure: 0.1 bar (0.2 bar in healthcare).
  • Maximum dynamic pressure: 3.5 bar.
  • Maximum supply static pressure: 10 bar.
  • Minimum flow rate: 8 litres/minute at mid blend with nominally equal supply pressures.
  • Maximum flow rate: 200 litres/minute.
  • Maximum pressure loss ratio: 10:1 (in favour of either supply during flow).


Body - DZR brass chrome plated.

Third party certifications
  • BS 7942 : LP-T44 Low pressure bathfill - LP-T46 Low pressure bathfill
  • Sanitary tapware - BS EN 1111 : Thermostatic mixing valves (PN10) General technical specification
  • Sanitary tapware - BS EN 1287 : Low pressure thermostatic mixing valves. General technical specification
  • Buildcert: Certificate - ETC 131/0501 : Buildcert TMV3 Thermostatic Mixing Valve Scheme approved
  • Water Regulations Advisory Scheme (WRAS) approved
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