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Product at a glance

HRT-ASR-ZW is a three-ampere Z-Wave relay switch designed to fit on an industry standard 6-pin wall plate, and is an ideal replacement for traditional wired heating controls. It is a single-channel switching unit that is well matched for use with combi boilers. It is easy to integrate with other devices using the interoperable Z-Wave standard, and is suitable for applications that require low-power remote switching. It has three LEDs that give a clear indication of the switch and network status. Buttons on the front fascia provide local control, with tactile feedback.


Boiler switching HRT4-ASR-ZW is ideal for boiler control when used together with a SRT321 room thermostat. Manual on and off buttons on the front panel provide local override functionality.


  • Mains-powered boiler switch
  • Acts a Z-Wave® repeater, to extend range and signal coverage
  • 3-ampere rated
  • Switched live or switched circuit operation
  • Switch status indication
  • Manual on/off operation


Control type Micro-disconnection, volt-free
Supply 230 V, 50 Hz
Contact rating 3(1) A, 230 V
Case material Flame-retardant thermoplastic
Dimensions (W x H x D) 86 mm x 86 mm x 36 mm
Enclosure protection IP30
Impulse voltage rating Cat I 1500 V
Insulation type Double insulated
Pollution degree 2
Operating temperature range 0˚C to +40˚C