How to Choose a Commercial Pressure Washer: PSI, GPM & Electric vs Gas (Canada)
You don’t buy a pressure washer for the sticker PSI.
You buy it so loading docks, fleet vans, and grease spots don’t eat your whole afternoon.
This Canada facilities guide gives you three numbers and one decision tree: PSI, GPM, Cleaning Units — plus electric vs gas and hot vs cold — so you match the machine to the dirt you clean most often.
Ranges below are starting points from public industry guides. Always test a small area, use the right nozzle, and follow the surface manufacturer’s guidance.
The 15-second cheat: PSI punches, GPM rinses, CU compares
PSI = how hard the water punches (intensity).
GPM = how much water you dump on the dirt (rinsing speed).
Cleaning Units (CU) = PSI × GPM — the “real power” number when comparing two machines.
Ignore marketing “max PSI” spikes. Use rated PSI × GPM.
Mini example: Machine A is 3000 PSI × 2.0 GPM = 6,000 CU. Machine B is 3000 PSI × 4.0 GPM = 12,000 CU. Same punch. Double the rinse. Machine B finishes big concrete faster.
What’s dirty — and is it greasy?
Start with soil type, not brand rankings.
- Dirt / mud / dust: cold water is often enough
- Grease / oil / food residue: hot water changes the game (like hot dishwater on greasy pans)
- Soft surfaces (paint, wood, vinyl): lower PSI + wide nozzle / soft wash
- Big hardscape (concrete, docks): higher GPM wins the clock
Cause: you buy the biggest PSI on the shelf.
Effect: etched concrete, peeled siding, voided warranties — and overtime labour if you underbought flow.
Electric vs gas vs battery (facility reality)
| Situation | Lean toward |
|---|---|
| Indoor bay / garage / quiet hours | Electric — plug in, quiet, no exhaust |
| Far from outlets / large lots | Gas — stronger for big concrete outdoors |
| Spot jobs / tool-battery ecosystem | Battery — know the runtime tradeoff |
Canada freeze note: drain the pump and use pump saver. Don’t store a wet unit outdoors in winter.
Hot water vs cold water (the commercial fork)
Most homeowner blogs skip this. Facilities shouldn’t.
Cold water pushes grease around. Hot water helps melt and lift it — so grease jobs finish faster with less chemical wrestling.
If your weekly mess is kitchen waste, engine bays, or oily docks, put hot & cold on the shortlist before you stack more PSI.
Job-matching cheat sheet
| Job / surface | Typical PSI | Typical GPM | Notes |
|---|---|---|---|
| Fleet / cars / vans (painted) | 1,200–1,900 | 1.4–2.0+ | Wide nozzle; keep distance |
| Vinyl / painted siding | 1,300–2,000 | 1.5–2.5 | Don’t force water behind panels |
| Commercial building exteriors | 2,000–3,000 | 2.0–4.0 | Balance force + flow |
| Sidewalks / parking / concrete docks | 2,500–4,000 | 2.5–4.0+ | Surface cleaner = even finish |
| Heavy oil / grease on concrete | 3,000–4,500+ | 3.0–6.5+ | Hot water preferred |
| Paint / graffiti (pro) | 4,000+ | High flow | Specialist technique; damage risk |
For commercial production work, GPM often matters more than stacking PSI above ~3000.
Nozzles & attachments that save (or wreck) surfaces
- Narrow tip = laser (dangerous on paint/wood/people)
- Wide tip = soft shower (safer for siding and fleet paint)
- 0° / red tip on paint, wood, or near people = bad idea
- Surface cleaner on concrete = fewer zebra stripes, faster docks
- Soft wash beats blasting on vinyl and delicate coatings
Spec checklist before you buy
- Surfaces you clean weekly (not once a year)
- Square footage / how long jobs take now
- Grease? If yes → hot water path
- Power available (outlet vs outdoor lot)
- Inlet water flow (don’t starve the pump with a skinny hose)
- Pump duty — light axial for occasional; tougher pumps for daily commercial hours
- Hose length + accessories budget (surface cleaner, nozzles)
What cleaning businesses often get wrong
- Shopping max PSI, not rated PSI × GPM
- Buying a cold machine for kitchen grease / engine bays
- Using a 0° tip on paint, wood, or near people
- Forcing water behind vinyl siding
- Starving the pump with a long skinny garden hose
- No PPE (eyes, closed shoes; hearing on gas)
- Skipping winter drain / pump protection in Canada
- Blasting soft surfaces that need soft wash
- No surface cleaner → zebra stripes on concrete
- Undersized extension cords on units that forbid them
A simple product path (Industrial Touch)
Shop the full commercial pressure washer collection. Free shipping across Canada.
- Everyday facility electric: DEWALT 2100 PSI electric cold water or DEWALT 3000 PSI brushless electric
- Outdoor concrete / contractor lots: Dynablast 3500 PSI gas or King Canada 3200 PSI gas
- Grease / sanitation: Dynablast hot & cold 1900 PSI 4 GPM
Cleanup workflow when it fits the job: wet/dry vacuums for rinse water, cleaner/degreaser for oily soils, and a blower / air mover for dry-down.
FAQ
What PSI for commercial pressure washing?
Most facility work lands around 2000–4000 PSI depending on the surface. Fleet paint stays lower; concrete and grease go higher — and grease prefers heat.
Is GPM more important than PSI?
For billable square footage, often yes. Once you’re near commercial PSI, more GPM usually finishes docks and lots faster.
Electric or gas for a cleaning business?
Electric for indoor/quiet bays with outlets. Gas for outdoor lots and jobs far from power.
Do I need hot water?
If grease/oil/food residue is a weekly problem, yes — heat beats brute force for those soils.
Pressure washer vs power washer?
Marketing often uses “power washer” for hot-water units. Ask for hot vs cold and the rated PSI/GPM so you’re comparing the same thing.
Ready to match PSI and GPM to your jobs?
Pick the machine for the dirtiest surface you clean often — then confirm electric vs gas and hot vs cold.
Browse commercial pressure washers with free Canada-wide shipping. Need a second set of eyes on CU for your routes? Ask — we’ll help match the spec to the job.