Variables in Pressure Washers

A number of outdoor cleaning projects utilize rapid fire, pressure washers. This guide will provide you with the data you need for your next job, so as you can understand the different variables that come with using a pressure washer to the best of your abilities.  


All pressure washers work in the same way, whether you call them external cleaners, power washers, or pressure cleaners. The water first  enters the machine at low pressure, and then a gas or electric engine pumps water at high pressure via a hose and a spray nozzle. If a garden hose doesn't cut it, pressure washers provide the energy you need for effective cleaning.


  • Electric Pressure Washers

    • Electric pressure washers usually cost less than gas ones, start with a flip of a switch, run quieter and cleaner, and weigh less than gas models do. Electric washing machines are typically less strong and less mobile than gas models. However, they are better suited for cleaning patio units, grids and cars, for example, for light-duty work.

  • Gas Pressure Washers

    • Gas pressure washing machines allow you to relocate the machine. This also allows you to clean bigger spaces, such as decks, patios, sidewalks and exterior walls. While certain gas pressure washing machines have a manual pull-start, some have a push-start button. Always follow the demands of the manufacturer to maintain the fuel performance of your machine.


There are also different strengths of the different power washers, and customers will decide which power is better for them, based on the tasks that they will be doing with their power washer. 


  • Light-Duty

    • The pressure washers are typically categorized between 1300 and 1900 PSI.  At a GMP of 2, this is the perfect rate for lower job applications around the home. These compact, and easy-to-use machines are perfect for the clean-up of patio furniture, grills, cars, decks and courtyards.

  • Medium Duty

    • Overall, these power washers tend to be gas driven, and produce between 2000 and 2800 PSI at 2 to 3 GPM. The robust, stronger units make it simple to clean everything from external cleaning and fences to passageways and drives. They are best used for home use and shops. 

  • Heavy Duty

    • These professional pressurizers are ideal for everyday business applications, ranging from 2800 PSI to 3 to 4 GPM. Heavy work is done quickly and efficiently, typically using gas-powered units. Tasks that these pressure washers can take care of include graffiti removal, paint stripting and a two story home wash, and other large cleaning tasks.


Additionally, pressure washers do well with different types of nozzles, which will be described below. 


  • Red Nozzle

    • This is a 0 degree nozzle, and is the most powerful nozzle

  • Yellow Nozzle 

    • This is a 15 degree nozzle, and is used for heavy duty cleaning

  • Green Nozzle

    • This is a 25 degree nozzle, and is used for general cleaning

  • White Nozzle

    • This is a 40 degree nozzle, and is used for more delicate objects like cars

  • Black Nozzle

    • This is a 65 degree nozzle, and is used to spray the chemicals at the beginning of pressure washing sessions