It's not only the psi that's important with a powerwasher, but also the gpm (gallons per minute). It's similar to Ohm's Law, if you have high psi, but low gpm, you'll have low power. I personally would not purchase electric, I'd invest in a gasoline washer. with a Honda engine. I have an 11 hp Honda engine running a Generator Pump 3000psi/4.0 gpm...plenty of power! The Honda engine is 25 years old because I perform the maintenance.
2000 - 2500 psi @ 2.0 gpm, at a minimum, should work for your job.
Another idea is for you and a couple of neighbors rent a powerwasher for the weekend. Maybe rent it on a Saturday morning and return it Monday morning.
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