Pressure washer longevity is heavily controlled by the owner. Frost-free storage, clean inlet water and correct startup/shutdown routines protect the pump, which is often the most expensive component.
What commonly determines lifespan
Pump seals/valves, hoses, guns, nozzles, switches, unloader, frost damage
This profile is an editorial summary of sourced lifespan context, common service points, maintenance leverage and repairability. See the linked methodology and primary reference before treating any range as a guarantee.