Central heating not heating house to desired temperature - Weather Compensator

[Ermintrude]

If you have high volume rads with moderate surface areas (big cast iron ones) overshoot is common . Get a decent smart start / initiative stay.

 

[doitmyself]

The heat curve for the UK is closer 2:5 with the boiler stat set to max.

I would have thought the heat curve depended on the level of insulation in the house.