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Hi, After getting some quotes for a new combi boiler, I'm a little confused as to which size boiler - DHW wise - would be appropriate? The 2 choices are: Vaillant 831 @ 12.7 l/m Vaillant 837 @ 15.2 l/m The house: Incoming mains measures at just over 16 l/m and pressure at 3.5...