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Thanks for the info from both respondents I think you made me realise that it is the flow rate I need to look at for running the shower I want, and the 837 and 937 both have 15.2 so I think this is big enough, Do you agree? Witch

Hi I am thinking of getting a vaillant 637 ecotec pro boiler which I know will easily run my 12 rads, but have seen a 'must have' shower with jets etc and need to know if this boiler will supply enough water flow for this sort of water output, I have been told that the pro 28 is not big enough...