I subbed some work to a guy recently who helped us out on a large car park. He had two of these, big impressive looking machines but they just don't have the flow rate and failed to keep up.
I am sure they will be fine on most applications and domestic and small commercial works, are they about 11 litres per minute. Our minimum would be 15 lpm.
Not the highest flow or psi but you have heat.
If you were given it then you had a bargain.
Rob