Honeywell EVOHome Boiler status

I have Honeywell EVO Home thermostats and am in the UK so use the integration via configuration.yaml file, which is fine and works ok, however I would like to be able to track when the boiler has been asked to supply heat, does anyone have a method for this? I thought about doing some work on the output of a temp sensor on the outgoing pipe to give me a calculated Boolean but not sure if this would operate fast enough after it stops and the pipe starts to cool or if the sensor would be damaged by the high heat.