> Huh? Every car I've had for decades has a soft "stop" half way where the 
> door is quite stable.  You can then push it a bit harder and it locks 
> all the way out.  Try it!

Doesn't seem to work with my Renault Megan III.


does work there.

>> Why are the downstairs taps connected to the mains, but the upstairs 
>> ones connected to a tank?
> 
> To stop you having mains pressure cold (~1-5 bar) next to tank pressure 
> hot (~0.2 bar) in the bath.  Imagine what happens when you connect one 
> of those old-fashioned shower adapters to the bath taps, turn hot and 
> cold to full and then turn *off* the shower head.  Fortunately now we 
> have taps with back-flow prevention valves and fancy mixer taps to avoid 
> this problem. Many houses don't have a cold tank, and some won't have a 
> hot tank either (the hot is heated on-demand by the boiler).

My house doesn't have and has never had a hot water tank. As you say, 
water is heated on-demand. Which, come to think of it, means that only 
the cold tap is fed from a tank. Given that there's no noticable 
difference in water pressure between the two, that makes the need for a 
tank even more dubious.

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