We have recently bought a ritmo and run it from our own water butt with our own pump, we also have our own genny so that we are 100% independent i'd say its the way to go i couldn't be ar5ed with the hassle of the water pressure dropping every time someone else was trying to draw water from the same supply or some idiot unplugging you from the site genny.
incidentally we use a 230v ritmo and we have had it on a few sites for major house builders now with no problems, even had a health and safety inspection by HSBC who had a good old nosey at what we were doing, it was obvious we were running 230v from the blue plugs on the machine and genny but he wasn't in the slightest bit concerned, probably because he knows 230v isn't banned by the HSE and he could see the breakers on the machine and genny, he did however give the labourer a dressing down because his dust mask wasn't face fitted...:RpS_sneaky: they always get you for something those B******S.....