Was your old one a combi, have you had any insulating done on your property, was the old boiler correctly sized ? Condensing boilers have been around at least since the 70's in the UK (trisave), and with new controls & fans/gas valves on newer boilers, they will be a fair bit better than them, but not a lot if the one it's replacing is less than 15 years old and like for like.
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