HA and heat sensor (high temperature)

Hi,

I’m looking for a heat sensor (high temperature) that is compatible with HA.
I want to detect if a (dumb)pelletstove is active or not and I can only think of heat sensors.
I don’t use any Z-Wave or ZIgbee.
I use HA in docker on an Intel NUC.
Anyone has an idea or experience with that ?

Best regards,
Eddy