I was wondering if someone has done something similar:

I want to detect if one of the kitchen burners have been running for a long time. Gas sensors won't work because the fires are running.

I was thinking that a solution could be to have a wifi-enabled thermostat that sends the temperature to home assistant and if it is above > X for Y minutes, send an alarm/email/notification. The sensor could be hidden below the burners and connected via a cable to measure the temperature.

Does this make sense? Does anybody have some idea how to implement this (maybe using a ESP8266)?

Is there other alternative?

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