>> 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.

Nice idea. One small problem: How the HELL does the water make it up an 
extra floor to reach the tank??? :-P

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