The everyday problem
A thermostat shape or brand does not reveal the system voltage or stages.
An ecobee Enhanced option for one confirmed compatible HVAC system.

A thermostat shape or brand does not reveal the system voltage or stages.
Photograph labeled existing terminals without disconnecting them and run the manufacturer compatibility check with an installer.
Do not use on line-voltage baseboard systems unless explicitly supported. No link to the Aqara sensor sets is assumed.

Check the official HVAC compatibility tool, C-wire or supported PEK installation, and local electrical requirements.
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