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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...

thanks for all responses. my only concern is whether I would be able to fit somehting like the vaillant in an outside boiler house. I was looking at the fitting instructions which said they shouldn't be fitted anywhere where there is a risk of frost - I would have thought that this would be...

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...