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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-
Thanks, I'm trying to work out if I can fit a nest myself. I have this over at the boiler....
https://photos.app.goo.gl/YKK7WgEYFaQqkABD7
Do you (or anyone) know if it is as simple as wiring the heat link in the same way then just sticking the nest on a stand?
dst2
Can anyone tell me what is going on here? Its a thermostat.
https://photos.app.goo.gl/EuhRaKmDcbq4iSVx6