In article ,
Sparks wrote:

I beg to differ, most machines use a solenoid valve to control
their water intake, these valves do have a minimum pressure to
open. I just picked a random machine and downloaded a manual...
AEG Lavamat 1260 needs a minimum of 7PSI, that is .48 Bar, or 4.8
meters of head.

I tested a few w/m valves for a job once and
have a vague memory that they do need a minimum
pressure but it is needed to do a proper closing
of the valve.

--
Tony Williams.