In an earlier contribution to this discussion,
Dave wrote:

Last Saturday, I spoke to the man behind the counter, of the place
where I am going to buy my wash hand basin and loo. He tells me that
the modern quarter turn taps can be difficult when supplied with low
pressure water. Water getting from the hot supply to the cold, or the
other way round.
A plumber told me today, that they should work fine on tank fed water.

Who do I believe?

Dave

Some modern taps have very poor flow rates when fed with tank pressure
rather than mains pressure.

If you're feeding a tap with cold water at mains pressure and hot water at
tank pressure, it's important that the hot and cold have independent paths
all the way to the discharge nozzle - rather than mixing further back in the
tap. Maybe this was what the man behind the counter was saying? If the
mixing takes place further back, the mains pressure cold can push the low
pressure hot *backwards* up the feed pipe. I think you're supposed to fit
double check valves to prevent that sort of thing anyway - but I'm not sure
how many people do!
--
Cheers,
Roger
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