>> It's different in the UK, the mains pressure usually equates to about
>> 10-50 metres plus of head. Any water from a tank in the roof is usually
>> *way* lower pressure than mains. For example you can easily block off a
>> fully open hot tap with your thumb with very little force, but it is
>> tricky, if not impossible to do the same on a mains pressure cold tap.
>
> Is this everywhere, though?

Pretty much, water companies are required to supply at a minimum of 1 bar, 
which means upstairs you'd get a guaranteed ~0.7 bar.  Unless you are able 
to put a tank 7 metres higher than upstairs it's not going to give any 
improvement over the worst mains pressure.

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