Originally Posted by Picky owner
How does it change the heat setting,if the old dial for adjusting the heat is on the boiler outside,just trying to get my head around it as the timer switch inside just turns it on and off..
That setting on the boiler is the water temp. I've literally never touched that dial since the boiler was installed. The indoor thermostat measures indoor air temp. It will turn on the boiler until the room reaches the preset temp and then turn off the boiler or just that zone.