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>> 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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