In message , Set Square
writes
The CM67 also has an 'optimum start'
option whereby you tell it the time at which you need the house to be up to
temperature, and it decides when to turn the heating on

How does it work this out? does it 'learn' in someway, or is it som e
sort of preset - if it's 5 c then turn on 1 hour before sort of thing?

--
Chris French