Given that engineers define any amount of pressure over 150 PSI as "high pressure", any high power pressure washer with a max PSI of 1000 to 4000 or more is not just powerful, it's a force. Pressure washers come in electric and gas-powered models. Most generally, electric pressure washers are limited to light- or heavy-duty residential power washing. Hot water electric pressure washers are much more powerful and are used commercially. Gas-powered models typically provide higher water flow rates and pressure, making them ideal for heavy-duty residential and professional jobs.
Pressure and Water Flow
The maximum pressure measured in pounds per square inch and the rate of water flow measured in gallons per minute define a pressure washer in terms of its power. Of these two factors, flow rate is actually a better indicator of machine efficiency, for the more water passing through the pump orifice, the faster and more effective the cleanup. High power pressure washers put out anywhere from roughly 1.3 to 8.0 GPM and have a max PSI that usually doesn't exceed 4000, but 5000 PSI units are available.
Parts and Accessories
Pressure washers commonly use a direct drive axial pump to pressurize water. Durably built with brass, stainless steel and ceramic components, the pump is the heart of the tool. Accessories including a single- or dual-wire wrapped hose, spray gun, extension lance and spray adjustment nozzles are necessary during for machine operation.