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Means a lot of people have condensing boilers that aren't running in condensing mode as they either were incorrectly fitted or just turned up too high to get the rads hotter quicker which is a lot less efficient. For the it to condense it needs the return to be cooler, so you are better running the boiler cooler for longer which can be much more efficient but if your radiators or piping weren't correctly sized then it can be hard to achieve.
greentricky-
Nice one, mine was at pretty much max so I have turned it down to somewhere in the middle - will see if that helps.
Was also a good reminder to have a check on it generally as I saw it needed repressurising. Presumably that in turn means I now need to bleed all the radiators and possibly re-repressurise.
lemonade
What does this mean and how do you do it?