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ElectSmart PRO-900Z in Home Assistant

Thermostats & TRV · Zigbee · Thermostat for electric floor

Zigbee2MQTT Quirk proposed, not merged yet 2 open reports

Zigbee device – see the note above on what ZHA needs for it.

Brand: ElectSmart
Model: PRO-900Z
Device type: Thermostats & TRV
Radio: Zigbee
Reports itself as: _TZE204_tagezcph
Zigbee2MQTT: Device page on zigbee2mqtt.io

How the device gets into Home Assistant

official ZHA – with a Zigbee coordinator and the ZHA integration; for all its functions it needs a custom quirk, see above. Integration
add-on Zigbee2MQTT – Zigbee2MQTT runs as an add-on and passes the device on to Home Assistant over MQTT. Integration · Source

Known problems and fixes

Requests for ZHA support

support requested The Beca–Moes–Bseed BHT-009 thermostat is not supported. Adding a quirk would allow Home Assistant to manage its heating settings. since January 11, 2026 · zha-device-handlers #4645
support requested The device with model TS0601 and manufacturer code _TZE204_tagezcph is not supported in ZHA. Adding support would enable Home Assistant to recognize and use it. since December 5, 2025 · zha-device-handlers #4551

Changes proposed for ZHA

pull request A pull request proposes adding support for the ElectSmart MAX-910Z thermostat. This would allow ZHA to correctly handle its specific commands and features, which are not working properly today. since November 2, 2026 · zha-device-handlers #5650
pull request The ElectSmart underfloor heating thermostat is not recognized by ZHA. The proposed change would enable Home Assistant to control the thermostat's temperature settings. since May 10, 2026 · zha-device-handlers #4986
pull request A proposed change to add support for a BSEED thermostat, allowing it to be controlled and monitored via Home Assistant. since February 9, 2026 · zha-device-handlers #4744

ZHA quirks for this device

Quirk proposed, not merged yet Recommended quirk

Proposed to ZHA and waiting for review – the maintainers check it before it becomes part of Home Assistant.

Adds: Operation mode Min temperature Max temperature Low temperature protection High temperature protection Eco temperature Deadzone temperature Floor temperature Sensor Child lock +19

Source: zha-device-handlers · pull request #4986 · by @kaitlinsm · May 10, 2026
Signature: _TZE204_tagezcph / TS0601

2 more quirks for this device

Quirk proposed, not merged yet _TZE204_tagezcph / TS0601 zha-device-handlers · pull request #5650 · by @konstantin-sazykin · November 2, 2026
Quirk proposed, not merged yet _TZE204_tagezcph / TS0601 zha-device-handlers · pull request #4744 · by @MummyCH · February 9, 2026

The quirk is not part of ZHA yet. You can use it as a custom quirk until it is:

Tell ZHA where custom quirks are kept – in configuration.yaml:
```
zha:
  custom_quirks_path: /config/custom_zha_quirks/
```
Create that folder and save the quirk as a .py file in it.
Restart Home Assistant. If the device was paired before, reconfigure it or remove and pair it again so the quirk is applied.
Check it worked: the device page shows the quirk under Zigbee info.

A custom quirk has not been reviewed by the ZHA maintainers. Delete the file once the quirk is part of a Home Assistant release – otherwise the old copy takes precedence.

All quirks in the ZHA quirk database →

Alternatives

The same job from other makers – devices of the same type and radio that work with Home Assistant too.

Aqara SRTS-A01 Thermostats & TRV · Zigbee · Smart radiator thermostat E1 Zigbee2MQTT ZHA quirk 1 open report Review · from 180.48 €
Zen Zen-01-W Thermostats & TRV · Zigbee · Thermostat Zigbee2MQTT ZHA quirk 1 open report Review
Alecto SMART-HEAT10 Thermostats & TRV · Zigbee · Radiator valve with thermostat Zigbee2MQTT ZHA quirk Review
Brennenstuhl HT CZ 01 Thermostats & TRV · Zigbee · Radiator thermostat Zigbee2MQTT ZHA quirk Review

Sources: Zigbee2MQTT, ZHA quirks, Z-Wave JS, the Matter certification database, Shelly, ESPHome, Tasmota, Tuya Local and the issue trackers on GitHub. Reports are assigned to a device by the identifiers they contain; the sentences come from the integration pages, where a language model writes them from the titles.