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lemonade-
What does this mean and how do you do it?
Also interested.
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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.
Tonts
greentricky
A lot of people would probably save on gas if they just got thier boiler condensing properly