In article ,
Christian McArdle wrote:
I take it you've never tried the likes of an Aqualisa shower fed 22mm
from a gravity fed system with a reasonable head?

The problem is that the gravity system can't provide the pressure. OK,
if well designed, they can provide good flow rates (i.e. for a Victorian
style drencher), put you'll never get a nice pounding from the pulse
function without a bit of push. That needs at least 1 bar, preferably
more. That's over 10m of head. Many people can't afford to buy an entire
block of flats so that a tank can go on the roof.

It depends, I suppose, on what you want. I prefer a drenching to a high
pressure dribble.

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*Any connection between your reality and mine is purely coincidental

Dave Plowman London SW 12
RIP Acorn