I've had a new boiler, rads and ESI wireless programmable thermostat fitted. Almost need a degree to program it. It has optimum start (switches on early so the house is at the desired temperature at the start time). Delay start (doesn't switch on if the house is at the desired temperature). Optimum stop (switches off if the house is at the desired temperature).
So the last two do nothing more than a regular stat!
Something I did learn was you need one rad without thermostatic valve, or a by-pass to prevent the pump driving at a fully closed system if all the valves are shut.
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