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I've been advised that the Worcester 440 is likely to be the best choice for me (apparently if I went for a Vaillant 937 or something similar it would need me to upgrade the size of the gas pipe, which would be difficult due to the location of the boiler). Can anybody give me a ball park idea...

we have a worcester highflow 4.5 (storage boiler - i've been told it's not exactly a combi, but works on the same principle i.e. no hot water tank ) which is about 13-15 years old, and seems to be on its last legs, so looking for a replacement. Looks to me like the most sensible option is a...