Most high pressure washers are used for a range of commercial and industrial applications. While higher pressure levels generally mean more power, the highest pressure levels may not necessarily suit every type of application. The power and effectiveness of high pressure washers depend on factors other than pressure levels. These include temperature, flow rate, continuous operation, controlled water spray, and nozzle orientation.
Very high pressure levels may damage certain surfaces. For example, car exteriors should not be sprayed with water at pressure levels higher than 1500 psi. High pressure levels can leave scratches on the car, peel off paint, and even dent the thinner metallic sections of the car. High temperatures and options, such as 100 percent wet steam in machines like the Super MaxTM 7000SP, can compensate for the lack of pressure.
If unsure about the right pressure level for a particular surface, use the patch test. Select a non-conspicuous part of the vehicle, boat, wall, or other surface. Point the water spray at the surface from a distance of 3 feet. If the paint does not crack and the surface remains otherwise intact, close the gap slowly. Stop the moment you feel the surface is beginning to show signs of strain. However, this method is not recommended in the case of vehicle detailing, as a maximum pressure level of 1500 psi has been pre-determined.
