"keith" wrote
| Please can some one tell me which is most efficient if you want to
| get the central heating up to say 22 degrees in time to get up in
| the morning....
| Leave the thermostat on 22 degrees and have it come on earlier
| for longer or
| Put it on 26 &/or turn up heater temperature and let it come on later.
| I've puzzled so much I'v econvinced myself both ways, but there must
| be a scientific answer...

Turning the thermostat to 26 will make no difference to how much heat the
boiler will put out and thus no difference to how long it takes to heat the
room. It only affects at what degree of warmthness the CH turns off.

The only ways to get the room warmer earlier a
1. Turn the heating on earlier
2. Increase the heat output of the system by adding radiators if there is
spare boiler capacity, or increasing the size of the boiler

Owain