Display remaining trigger flow time and extend trigger time

Would there ever be a need to shut it off before the timer ends?
How are you actually controlling the heater?

I posted a thread awhile ago to control a coffee pot (I’m still using it) you might be able to adapt

  • it has a count down timer displayed
  • a button on the dashboard
  • it turns a smart plug on/off

I’m the button turn it on for 20 minutes and - this is something you would need to change - the button can shut it off too.

In your case I would have a second button to add more time so the original button still could shut it off if needed.

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