Not a very familiar with this but heard my friend mention about the home general usage type and the commercial motor system difference where the motor can withstand longer usage time so the motor doesn’t burnout over time and lasts longer.
Currently using karcher given by old neighbours who moved away and can felt the motor is dying too as it “coughs” after a while usage.

Can’t really see the model anymore as it has been quite old and only use it once or twice a year. It was pretty good and iirc it was 100 psi only and it’s pretty good for car porch washing. Can brighten up the entire blackish top yearly haha