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.
Notes last checked Jun 2, 2026.
Compatibility snapshot
Home AssistantexcellentFull local control, no cloud needed. Native Home Assistant integration or a local protocol.
Apple HomenoneNo official support on this platform.
Google HomenoneNo official support on this platform.
AlexanoneNo official support on this platform.
Works offlineyes
Setupintermediate
Extra hub neededyes
Powerbattery
Local control facts
Home Assistant: zha integration, Local Polling (home-assistant.io, checked Sep 10, 2026)
Zigbee2MQTT: supported device, listed as Develco HESZB-120 (Fire detector with siren) (zigbee2mqtt.io, checked Sep 10, 2026)
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.
The local sensors that actually help with an aging parent: motion and presence, door contacts, environment, leak and smoke, plus alerts that work offline.
