My Nilfisk P150.2 is over 10 years old now. Put a new longer hose on and replaced the reel handle. Rock solid and a really well established parts availability.
Well worth the money!
I spied your mention of drawing water from a container, this isnt going to work on a high pressure machine, they require high flow rates. Even using some auto stop hose fittings restrict flow and seriously affect performance or result in the pump being starved.
I dont think these units are designed for drawing non pressurised sources.