If you're not using it frequently then anything powered by a Honda GC 190 will do just fine. It will last for years. Here is a link to pressure washer direct. I had a pressure washer powered by a 7 hp Subaru industrial engine and Cat 5 pump and I sold it and recently tried an el cheapo powered by the Honda GC 190. Honestly, I couldn't tell an appreciable difference between the two.
https://www.pressurewashersdirect.com/power/honda-gc190-engine-pressure-washers.html
