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...