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Live comes from the timer (or direct from the mains if you don't have one) through the thermostat. If the temperature is about the set point then the thermostat is an open (off) switch. If the temperature falls below the set point the thermostat closes and turns on the boiler (makes the call for heat line go live). About as simple as you can get.
jellybaby
@dst2
Can anyone tell me what is going on here? Its a thermostat.
https://photos.app.goo.gl/EuhRaKmDcbq4iSVx6