Pressure washing vs power washing: is there a difference?

When the two words do mean different things, the line is heat. A pressure washer in that sense sprays water at whatever temperature it arrives; a power washer heats it first. Pressure, flow and nozzles are the same idea on both.

The tinted column is our pick because it is the right machine for most homes. That is a statement about what most people need cleaned, not about what heat can do.

Pressure washing is cleaning a surface with water forced through a small nozzle by a pump. An engine or electric motor drives the pump; the pump pushes water down a high-pressure hose to a trigger gun; the nozzle on the end shapes the stream from a pencil jet to a wide fan. That is the whole machine, and every word in this argument describes some version of it.

Two numbers describe what it can do. PSI is the force that breaks dirt loose; GPM is the flow that carries it away. Multiply them for cleaning units: a 3000 PSI / 4 GPM machine is 12,000 CU. Our PSI guide explains why the flow figure matters more than the pressure, and the surface PSI chart lists the safe setting for 18 surfaces.

Read a dozen contractor websites and most will tell you the difference is heat: power washing uses hot water, pressure washing uses cold. That usage is real. It is just not a standard, and the companies that build hot-water machines do not follow it.

Read from each organisation’s own site on 2026-10-18. Catalogue names quoted as printed.

So the equipment side says “hot water pressure washer” for the heated machine. The trade association with “power washers” in its name, a non-profit founded in 1992, describes its members’ work as pressure washing. And the heat rule lives mostly in service marketing, where “power washing” is also simply the phrase many homeowners type.

In practice that means a company advertising power washing may never heat a drop of water, and a homeowner asking for power washing usually means “please clean this.” Neither is wrong. The word just does not carry the information you need.

Drop the label and ask for four things. Any operator who knows the work will answer them without hesitating, and the answers tell you more than either word ever could.

1. Water temperature. Hot or cold, and why on this job.
2. Pressure. The PSI used on each surface, not the machine’s top rating.
3. Flow. GPM, which decides speed and what surface cleaner the rig can drive.
4. Method. Pressure or a soft wash with chemistry. For walls and roofs this matters most.

Dot colours are the nozzle code: green 25°, yellow 15°, white 40°, black for the soap tip on a soft wash.

Only two rows want heat, and both are petroleum or food fat. Our guide to removing oil stains from concrete shows where a hot pass changes the result. For what a heated machine costs to run and own, read hot water vs cold water pressure washers; this page will not repeat it.

The walls and roof rows are not a pressure job at all. If a quote says power washing and the job is your siding, ask whether they mean a soft wash. Our soft wash vs pressure wash comparison covers which surface gets which.

Hiring. Price follows area, surface and soiling, not the name on the van. Homewyse puts basic pressure washing at $0.42–$0.52 per square foot and notes that a 2-hour minimum labour charge is standard. Run your own numbers through the pressure washing cost calculator. A hot-water job needs a heavier machine and burner fuel, so if one is quoted, ask for the heat to be shown as its own line. Weighing a hire against doing it yourself? See DIY vs professional pressure washing.

Buying. For a home, the machine you want is a cold-water pressure washer, whatever the box calls it. Read the PSI and GPM on the plate, then choose between sizes with 2000 vs 3000 PSI. A heated unit only makes sense once you have signed recurring grease work.