Temp outside – 10c
Temp inside – 19.3c
Heating off
S Wales
I have fitted a weather compensator to the external part of the boiler flu. Baxi call it an IFOS sensor. It compensates for varying outside temps and can reduce running costs. You can also get them as stand alone devices. Cost me £20 neither here or there in the grand scheme of things.
Some info how they work:
https://www.boilercentral.com/guides/what-is-weather-compensation/