Commercial Pressure Washer Spec Comparison Framework (AU)

The quote comparison looked tidy: three machines, three PSI figures, one clear winner. Two weeks after delivery, the winner tripped the circuit at the loading dock whenever it started, and the contractor was back to hiring a petrol unit for the car-park ramp, where the exhaust had nowhere to go.

The spec sheets were not wrong. The comparison was. This framework replaces the headline number with a weighted scorecard you can reuse on every quote.

Commercial pressure washer comparison: the short answer

Compare commercial pressure washers on a weighted scorecard, not a headline PSI. Write down the job and site limits, weight seven criteria to suit, score each shortlisted machine 1 to 5 against its product page and data plate, then multiply and add. The top total wins only if it passes every site limit.

The steps below build the scorecard, then run it on four Freshway-listed machines. If you are still working out what kind of machine the job needs, start with Freshway's guide on how to choose a pressure washer for commercial cleaning and come back with a shortlist.

Step 1: Build a scorecard around the job and site limits

Write a one-paragraph job brief before you look at any machine: what is being washed, how often, where the water goes, and what power is available at the point of use.

Then split the brief into two lists. Site limits are pass or fail: a 10 A outlet only, an enclosed area where exhaust cannot clear, or wash water that must be captured. Scored criteria are better or worse rather than allowed or not. A machine that fails a site limit is out, however well it scores.

Wash water is the limit buyers forget. The NSW EPA says runoff from any washing activity must not enter stormwater drains, and that washing of equipment or work floors should be confined to a designated wash bay draining to a collection pit and then to sewer, which needs council approval through a Trade Waste Agreement.

Step 2: Weight the parameters

Give the criteria weights that add up to 100, and set them before you look at any product, or the favourite machine will quietly shape them.

For cleaning output, use bar × L/min rather than pressure alone. It also lines up with safety classes: WorkSafe Victoria describes Class A jetting systems under AS 4233.1 as 800 to 5,600 bar litres per minute and Class B as more than 5,600. A 150 bar, 10 L/min machine works out at 1,500, which is Class A.

A starting set of weights for general commercial work is pressure and flow 25, power source 20, duty and build 15, service and parts 15, accessories 10, handling 10 and heat 5. Move points to heat for workshops and kitchens with grease, and to handling for crews who load the machine into a van every day.

Step 3: Score the power source

Power is often the deciding criterion, because it is half site limit and half preference. At 240 V, amps are watts divided by volts. The Makita HW140 lists 2.3 kW, about 9.6 A (2,300 ÷ 240), which fits a standard 10 A outlet with little to spare. The Kärcher HD 6/15-4 Classic lists 3.4 kW, about 14.2 A (3,400 ÷ 240), so it needs a supply rated above a standard outlet. Confirm the plug and circuit on the data plate.

Electric machines in wet areas need regular checks too. SafeWork NSW says electrical equipment must be regularly inspected and tested by a competent person, and points to AS/NZS 3760 for the methods, tagging and frequency.

Petrol machines remove the outlet question but add exhaust. SafeWork NSW's carbon monoxide guidance says work in enclosed or restricted spaces such as garages and plant rooms carries a higher risk, and that plant powered by combustion engines should be minimised where ventilation is not adequate. Battery machines remove both, but runtime becomes the constraint: Kärcher Australia lists the HD 4/11 C Bp at about 30 minutes per charge with 7.5 Ah batteries, needing two batteries, with battery and charger not included.

Step 4: Decide how much the heat option is worth

Heat is a weighting decision, not a yes or no. Hot-water machines add a burner, fuel and more servicing, and earn that cost on oil and grease. With no grease in the brief, keep heat at 5 points so it cannot swing the result. For a workshop floor or kitchen area, move 15 to 20 points to heat from handling and accessories.

Do not score heat on a temperature figure alone. Burner temperature ranges are listed differently between some product pages and brand data, so confirm the figure on the brand's current specification or data plate before it goes into the scorecard.

Step 5: Score the accessories that matter

Score what the job needs, not what the box contains. Is the hose long enough to reach the work, are the nozzles right for the surfaces, and is any surface cleaner rated for the machine's pressure and flow?

From the shortlist below, Kärcher Australia lists a 10 m high-pressure hose rated at 315 bar with the HD 6/15-4, and Freshway lists a 10 m hose on an integrated reel with the Makita HW140. Missing items are not a fail, but price them from Freshway's accessories range before you compare totals.

Step 6: Score service and repairs

A machine that cannot be repaired locally sits idle. WorkSafe Victoria's summary of AS 4233.1 says only the maker, their agent or competent persons should repair or maintain high-pressure water jetting equipment, so the service route is a safety question too.

Score how easily you can get parts and a technician. Kärcher Australia's spare parts finder works from the part number on the machine's nameplate, so record that number on the asset register at delivery. Freshway's service and repairs team works on pressure washers across Sydney, lists Kärcher and Makita among the brands its technicians handle, and quotes before any work begins.

Worked scorecard: four machines, one job

The job: a contractor washes a shopping-centre loading dock, a bin room and the entry ramp of an underground car park three nights a week. The dock has a 15 A outlet and a mains tap, the soil is food waste, grit and tyre marks rather than heavy grease, and wash water drains to sewer under the centre's trade waste arrangement.

The four machines, from Freshway's listings:

• Kärcher HD 6/15-4 Classic: 150 bar, 600 L/h (10 L/min), so 1,500. Electric, 3.4 kW.
• Makita HW140: 130 bar working, 500 L/h (about 8.3 L/min), so about 1,080. Electric, 2.3 kW.
• Kärcher HD 4/11 C Bp: 110 bar, 400 L/h (about 6.7 L/min), so about 730, below the 800 lower limit of Class A. Battery.
• Kärcher HD 7/15 G: 150 bar, up to 650 L/h (about 10.8 L/min), so about 1,625. Honda GX 160 petrol engine.

Each score is out of 5. The total is each score times its weight, added up and divided by 5, so a perfect machine scores 100. The scores are an example for this job only.

Criterion (weight)	HD 6/15-4 Classic	Makita HW140	HD 4/11 C Bp	HD 7/15 G
Pressure and flow (25)	5	3	1	5
Power source (20)	5	5	3	1
Duty and build (15)	5	3	2	4
Service and parts (15)	4	4	4	3
Accessories (10)	4	4	3	3
Handling (10)	3	4	5	3
Heat (5)	1	1	1	1
Weighted total (out of 100)	87	73	52	63
Site limits passed?	Pass	Pass	Pass	Fail (enclosed ramp)

The HD 6/15-4 leads because the 15 A outlet removes its one weakness. The HD 7/15 G has the output but fails the enclosed-ramp site limit, so it is out whatever it scores. Duty and build follows the listed pump type: Kärcher Australia describes a crankshaft pump with a 4-pole low-speed motor on the HD 6/15-4 M Classic (order number 1.367-900.0, the model Freshway lists), while Freshway lists an axial-piston wobble-plate pump on the HW140.

Now change one site fact. With only 10 A outlets at the dock, the HD 6/15-4 fails the power site limit and drops out, and the Makita at 73 leads. That is why the HW140 is the safer default where outlet ratings are unknown.

Brand-neutral selection rules

Five rules keep the scorecard honest:

1. Apply site limits before scoring, and record why any machine was removed.
2. Use working pressure, not maximum pressure, for bar × L/min.
3. Score from documents: product pages, brand data and the data plate, not reputation.
4. Where a product page and the brand's data disagree, leave that figure out or ask for the data plate.
5. Have two people score separately, then discuss any gap of 2 or more.

Common mistakes to avoid

Setting the weights after seeing the machines is the commonest mistake. Comparing a maximum pressure on one sheet with a working pressure on another is close behind, and so is reading a flow range as a single figure. Leaving out the runoff plan, or assuming every outlet has the same rating, turns a good score into a bad purchase.

The quieter mistake is treating the total as the decision. A 2-point gap is within scoring judgement, so when totals are close, let the sensitivity check decide.

Scorecard template

Copy this into a spreadsheet and add one column per machine.

Criterion	Weight	Evidence to check	Score (1 to 5)	Weighted (weight × score ÷ 5)
Pressure and flow	25	Working bar, L/min, bar × L/min, class
Power source	20	kW and amps at 240 V, plug, ventilation, runtime
Duty and build	15	Pump type, motor, hours per shift
Service and parts	15	Part number, local repairer, parts lead time
Accessories	10	Hose length and rating, nozzles, surface cleaner
Handling	10	Frame, wheels, loading, storage
Heat	5	Burner fuel, power, servicing
Site limits passed?	Pass or fail	Outlet, enclosed areas, runoff capture

Frequently asked questions

Next steps with Freshway

Write the job brief, set the weights, and score your shortlist from the commercial pressure washers range. Send the completed scorecard to Freshway for a second look at the figures before you order. Businesses that buy regularly can also ask about a trade account on the B2B dealer page.