Air Cooled or Water Cooled?
Air cooled for lighter duties, water cooled for more regular use.
What will you be cleaning?
Different kits come with different accessories which suit different jobs.
How often do you use your Pressure Washer?
Ensure you buy the right model for your needs.
Consider water flow rate as well as bar pressure!
Bar pressure is only useful if you have enough water coming out of the nozzle.
Is it used for commercial reasons?
Ensure you buy a commercially machine with a commercially backed warranty.
Do you need to move it around?
Smaller compact units are easier to move.