"Set Square" wrote in message
...
In an earlier contribution to this discussion,
chris French wrote:

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?

AIUI, it uses its previous experience to 'remember' the rate of
temperature
rise when the heating is running

It is referred to as "self-adaptive".