Looking to buy a mono tap for my new kitchen, and noticed that the taps are
rated according to operating pressure (bar). In particular I was looking at
this one
http://www.clickbathrooms.co.uk/prod...PKC015&cat=163

The tap will be fed from the mains (cold) and a combi boiler (yet to be
bought - hot). I haven't chosen the combi yet, but it will be a "standard"
one to be used for DHW (one bathroom, one kitchen) and the heating of a
small one-bed flat (4 radiators + 1 towel rail).

What tap rating should I look for?

Cheers.