I bought my v2 new in 2010. As with most 3 cylinder diesels there bomb proof, not much to go wrong really.
How much more do you need to pump ? I mainly used mine for rendering, try and get one with the built in pressure washer there a godsend, but I did use it for gyvlon screeds when I first got it, it handed it fine it will do sort of 10 tonne an hour, which is fairly going some at 30mm ish thickness over under floor heating.
A v3 has a 4 cylinder engine.