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Sona Wi-Safe 2 WHM-SN-1 Mains Powered Wireless Heat Alarm - Discontinued

Product Code: WHM-SN-1

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Sona Wi-Safe 2 WHM-SN-1 Mains Powered Wireless Heat Alarm - Discontinued Key Features

This product has now been discontinued

  • Provides Class A1 heat detection
  • Suitable for Grade D systems
  • Kitemarked to BS 5446-2: 2003
  • 5 year manufacturer warranty
  • Mixed system compatibility, suitable for hard-wired and wireless linking
  • Mains powered, with tamper-proof sealed for life battery back-up
  • Low energy usage (approximately 10% less than the average AC fire alarm)
  • 85dB sounder
  • Suitable for use in areas where smoke alarms may not be appropriate due to fumes or dust (e.g. kitchens, garages, lofts)
  • Designed to prevent dust ingress and draughts into the back of the device
  • Easy to install with an integrated ultra-slim mounting base
  • Combined test/silence/locate button
  • Intelligent locate feature for quick identification of triggered devices
  • Silence function for low battery chirp and known false alarms

Product Information

The SONA WHM-SN-1 is a 230V mains powered heat detector, with tamper-proof sealed for life battery back-up and both wireless and hard-wired interlinking capabilities. Under typical usage conditions, it uses approximately 10% less power than the average AC fire alarm, and has a battery life of 10 years.

Its integrated ultra-slim mounting base ensures easy installation in areas such as kitchens, garages, or lofts—areas where smoke alarms would be unsuitable due to high levels of fumes or dust.

'Sleep Easy' functionality enables the low battery chirp to be silenced for an 8 hour period (this function can be used up to a maximum of 10 times). The alarm can be temporarily silenced for up to 10 minutes in the case of a known false activation, however if the level of heat detected is very high, this feature will be overridden for your safety and the alarm will continue to sound. When the combined test/silence/locate button is pressed on any device on the network, all connected devices except the device that was triggered will be silenced, offering easy identification of the unit in alarm.

This product provides Class A1 heat detection, and is appropriate for use in Grade D systems. It is approved to BS 5446-2: 2003, ETSI EN 300 220-2 V2.3.2 (2010-02), EN300489-1 &-3 and EN300220-2 - Radio. The manufacturer warranty period is 5 years.


This versatile alarm is ideal for use in mixed systems, which means that it can be linked wirelessly with up to 50 compatible devices, as well as up to 30 units via hard-wiring with 3 core and earth cable. When any device on the system is activated, the 85dB sounders will sound on every other interlinked unit.

Thermistek Technology

Thermistek technology employs a unique radiant heat dish to maximise alarm performance during exposure to a radiant heat source. This product constantly monitors for temperature change, so that the alarm will sound earlier if the temperature is predicted to rise above a predetermined threshold.

Pack Contents

  • Wall Fixings
  • Instruction Manual

Compatible Devices

The below devices are compatible with the SONA WHM-SN-1 Wireless Heat Alarm:

Model Number  Model Type Interconnection Type 
SONA WTSL-SN-1 Control Unit
SONA WCOB-SN-1 Wireless Carbon Monoxide Alarm
SONA WSM-SN-1 Wireless Smoke Alarm
Wireless, hard-wired
SONA HM-SN-1 Heat Alarm
SONA SM-SN-1 Smoke Alarm

Technical Details

Manufacturer: SONA
Product Code: WHM-SN-1
Supply Voltage: 230V AC, 50Hz
Battery Back-Up: 10 year lithium battery
Technology: Thermistek and Wi-Safe 2
Alarm Sound Level: 85dB (A) at 3m (minimum)
Installation Positions: Ceiling
Alarms at Temperature Range: +54℃ to +65℃
Operating Temperature: +4℃ to +38℃
Operating Humidity: Up to 90% RH non-condensing
Storage Temperature: -20℃ to +60℃
Storage Humidity: Up to 93% RH non condensing
Plastic Material: UL94 V0 flame retardant
Warranty: 5 years
Approvals: BS 5446-2: 2003/CE
ETSI EN 300 220-2 V2.3.2 (2010-02)
EN300489-1 &-3
EN300220-2 - Radio
Operating Frequency: 868MHz
Max No. of Connected Units: 50 wireless units & 30 hard-wired
Networking: Multi-directional communication
Range: 35m (over 200m in clear air)
Dimensions: 141.5mm x 53mm

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