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Stello STLO-23 in Home Assistant

Thermostats & TRV · Zigbee · Hilo water heater controller

Zigbee2MQTT Quirk proposed, not merged yet

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

Brand: Stello
Model: STLO-23
Device type: Thermostats & TRV
Radio: Zigbee
Power: Mains powered
Reports itself as: STLO-23
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

Changes proposed for ZHA

pull request The Stello Water Heater controller is not recognized by ZHA. This pull request would enable Home Assistant to control water heater temperature settings. since May 6, 2026 · zha-device-handlers #4977

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: Temperature

Source: zha-device-handlers · pull request #4977 · by @jfsimoneau · May 6, 2026 · 1 approval
Signature: Stello / STLO-23

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 · from 91.06 €
Brennenstuhl HT CZ 01 Thermostats & TRV · Zigbee · Radiator thermostat Zigbee2MQTT ZHA quirk Review