I run a lombardini setup..proper diesel engined with belt driven pump..Its the first time ive used a engine powered washer as when i worked in london, the company ALWAYS used the karcher HDS hot water electric machines...and going from the way they always used to break down, id say that they arent made for the long days..
But im not sure about the engine driven karchers, But the lombardni seems to be built pretty tough, just cant find any parts!