I'll second that on the Cat pumps. In my neck of the woods the pressure washer business is big because of the hog industry. Darned near everyone who's connected with washing hog buildings recommends a Cat pump and they pur many, many hours on them. All pressure washers are just assembled parts that are made somewhere else so find a local dealer who's been there awhile and part with your money at his business. Do not go cheap. In my old shop I have a 1000 PSI washer that I bought at least twenty years ago and I haven't spent a dime on the washer itself. For the past 15 years it's been fed by the water heater in my shop, set at a slightly hot temp and it still keeps plugging along. I don't know what brand it is. I bought it at the local IH dealer, that's all I know. I have a 4000 PSI 4 GPM gas powered washer with hot water for big jobs, but the little one in the shop gets the most hours put on it.
I stole, er, bought the 4000 psi one with 20 hours on it for $500 with 50 feet of hose and several nozzles including a rotary. It has a 13HP Honda and Cat pump. The hot water comes from a used independent fuel burner on wheels that I picked up for $100. It's a little more complicated to use than an electric washer/heater combo but I only have $600 in the whole works. It's just an example of what you can get if you aren't hung up on going ultra modern and fancy.Jim