Aqara
Aqara Radiator Thermostat E1
- Zigbee
Verified September 2026
Sits squarely between our two other TRVs on price and finish: around £43, about £17 more than the SONOFF TRVZB but £17 less than the Bosch Radiator Thermostat II. Pairs straight into Zigbee2MQTT or ZHA (model SRTS-A01) with no Aqara hub needed — fully local, no cloud dependency. Two AA batteries are rated around a year under typical use, better than the SONOFF's roughly six months but well short of the Bosch's two years. Fits M30x1.5mm valves directly, with Danfoss RA/RAV/RAVL adapters included. A sensible middle ground if the SONOFF feels too plasticky but the Bosch's price tag feels excessive for what it is.
In Home Assistant
| Control | Type | What it does |
|---|---|---|
| Target temperature | Number | Set the heating setpoint |
| Preset | Selector (manual/away/auto) | Choose the operating mode |
| Window open | Binary sensor | Built-in detection of a sudden temperature drop — no separate contact sensor needed |
Zigbee2MQTT exposes the valve's own window_open detection as a binary attribute — built into the TRV's firmware from a sudden temperature drop, not a separate contact sensor — so an automation can drop the setpoint to away/eco the moment a window opens with zero extra hardware. Worth knowing if you're on ZHA rather than Zigbee2MQTT: climate.turn_off doesn't fully retract the valve into true off/summer mode there, a gap that doesn't exist on the Zigbee2MQTT path.
Specs
- dimensions
- Φ57 x 89mm
- battery type
- 2x AA (LR6) alkaline, not included; ~1 year typical life per Aqara (vs ~6 months on SONOFF, ~2 years on Bosch)
- zigbee version
- Zigbee 3.0
- temperature range
- 5-30°C setpoint range (rated operating environment 0-40°C)
- valve adapter compatibility
- Fits M30x1.5mm valves directly; adapters included for Danfoss RA, RAV and RAVL