>> Why are the downstairs taps connected to the mains, but the upstairs
>> ones connected to a tank? Why do we even *have* a tank??
>>
>
> Because the mains does not have enough pressure to push the water upstairs 
> at a tolerable force. If it weren't for the tank, you'd turn on the faucet 
> and get barely a trickle... With the tank on the roof, you get nice water 
> pressure.

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.

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