Older radiators emit a strong radiant heat fron the front panel, and stay hot longer after heat goes off. My 4 year-old new large finned radiators emit no significant radiant heat and cool down rapidly when heat goes off. My 4 year-old condensing combi boiler also modulates the flame and heat down to practically tepid radiator temp. Keeps the air temp in room constant but as the rads get cooler so do I and my visitors. They called off coming to me this Xmas < sad face>. Stat at 22, boiler on Max.
Iwipearses - yes I'm in the UK, and my midwife was giving advice based on what I was telling her - my baby only has a good night sleep when the heating is on that high, I tried it on 20 but she kept waking up every hour. I was advised to keep it on 25 if it works well for us, and daytime I could have it on 30 if that makes us happy.