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Just to clear up a few misunderstandings: The pump is a 15/60 not a 15/50 I have not measured the temperature drop across each radiator, just the boiler. It maintains at least a 20 degree drop for most of the heating cycle. The DHW cylinder stat is set to 55 degrees and the cylinder seems to...

Many thanks for the advice so far. I don't have a fast recovery cylinder, it is a standard one. I will try out some of your suggestions, any more ideas? Andy Miles

I recently paid British Gas to replace my old boiler with a new condensing one. My question concerns how to get the maximum efficiency from the new boiler when heating only the hot water. My house is a four bedroom, two story detached. The new boiler is a Worcester Greenstar 24Ri. It is an...