frient Intelligent Heat Alarm (HESZB-120)

Quick verdict

A Zigbee heat alarm that triggers on rapid temperature rise (not dust or steam), reporting locally to Home Assistant alongside a usable temperature sensor. Heat and fault state are delivered over Zigbee through ZHA/Zigbee2MQTT with no manufacturer cloud. Just note: Detects heat, not smoke, so it complements rather than replaces smoke alarms.

Standout: A Zigbee heat alarm that triggers on rapid temperature rise (not dust or steam), reporting locally to Home Assistant alongside a usable temperature sensor.

Last checked: 2026-06-02

Compatibility snapshot

Why it stands out

• Fully local over Zigbee via ZHA or Zigbee2MQTT
• Heat-based detection avoids false alarms in kitchens/bathrooms
• Reports live temperature; a Works-with-HA brand

Reasons to hesitate

• Detects heat, not smoke, so it complements rather than replaces smoke alarms
• Requires a Zigbee coordinator/hub
• Battery powered (no mains option)

Best for

• Kitchens, garages and attics where smoke detectors false-trigger

Avoid if

• you don't want to run a Zigbee coordinator

Privacy and local-control notes

Heat and fault state are delivered over Zigbee through ZHA/Zigbee2MQTT with no manufacturer cloud.

Home Assistant support: supported · integration path: ZHA / Zigbee2MQTT.

Buying reality check

Price notes: Around $55. Mid-range pricing.

Compare side by side: see smoke alarm comparisons →