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Sorry - I wasn't saying a combi boiler isn't a condensing boiler, just that my boiler isn't a combi boiler. I've not done it properly yet, but with a little laser heat gun thing I've got and had a little play with, I can't see how the temperature coming out of the last radiator in my home's...

I gave up on this question last winter due to the conflicting advice. One view is to only heat the rooms you need to heat, turning off the radiators in the others. This logically makes sense to me since the water is still as warm as possible when it returns to the boiler, hence requires less...