No socket, no limit · review
4000 PSI at 3.5 GPM with a 50 foot 3/8 inch hose and a Honda GX270.
Where this ends up Three and a half gallons a minute through a fifty-foot three-eighths hose, on a Honda GX270 — fourteen thousand cleaning units, which is nearly twice the Westinghouse at a third of the price. Seventy dollars below the Simpson with a house-brand engine and no low-oil shutdown.
Pressure cuts. Flow rinses. That is the whole distinction, and this is the first machine on the shelf with real flow.
At 2.5 GPM — which five machines here manage — you break the grime off a driveway and then push it slowly towards a drain. At 3.5 GPM it goes.
In cleaning units, PSI × GPM, the measure no listing here publishes:
Simpson CRX 4400 — 17,600 · Simpson ALH4240 — 16,800 · this — 14,000 · PowerSmart — 9500 · Simpson Aluminum 3600 — 9000 · Westinghouse WPX3400 — 8840 · Simpson PS3228 and PS61002 — 8250 · Westinghouse WPX3200 — 8000 · DeWalt — 7920 · Westinghouse WPX3000 — 6900
So this does fifty-five per cent more work per minute than the next Simpson down, and nearly twice what any machine under four hundred dollars here manages.
It also unlocks the accessory that transforms a driveway. A surface cleaner has no motor: its two nozzles sit on a swivel and are spun by the water leaving them, in reaction. Flow turns the head. Most need 2 GPM as a floor, and a twenty inch head — the widest sold — needs real volume to spin properly. At 3.5 GPM this will drive one.
The cost is water. Three and a half gallons a minute is 210 gallons an hour, which on a metered supply is a figure worth knowing before you start.
“Monster 3/8-inch x 50-foot high-pressure hose is kink- and abrasion-resistant.”
Both numbers matter together, and three listings on this shelf publish the pair.
A hose loses pressure to friction along its length, and a narrower bore loses more. So bore has to scale with length and flow:
Westinghouse WPX3000 — 0.25 inch over 25 feet at 2.3 GPM, the narrowest here Simpson PS3228 and Aluminum 3600 — 5/16 inch over 25 and 35 feet at 2.5 GPM this, the CRX and the ALH4240 — 3/8 inch over 50 feet at 3.5 to 4.0 GPM
Fifty feet of 5/16 inch at 3.5 GPM would drop real pressure at the nozzle. The Monster hose is wide because it has to be.
What fifty feet buys in practice: you clean a whole side of a house without moving a 120 lb machine. The 25 foot hoses on six listings here mean repositioning constantly.
Threaded M22 is the domestic standard, and what lets you fit a surface cleaner or foam cannon. Only the Westinghouse WPX3400 on this shelf says what M22 actually lets you buy.
And a 31 inch steel wand, nearly twice the 16 inch wands on the three smaller Simpsons and the DeWalt — which is the difference between reaching a gutter from the ground and fetching a ladder.
Honda GX270, against the Simpson CRX 4400 at $899.99 which runs Simpson’s own “CRX 420cc premium engine”.
The CRX delivers more — 4400 PSI at 4.0 GPM, 17,600 cleaning units — and gives up two things for it.
Parts and service. A Honda GX is the most widely serviced small engine family in the world. A carburettor, a recoil spring or a gasket set is available anywhere, and anyone who services garden machinery knows it. A CRX is Simpson’s own.
Low-oil shutdown. The CRX listing does not publish one. The three Honda GX200 Simpsons here all do, and so does the DeWalt at $429. A low-oil cutout kills the ignition before the engine seizes, which on a machine used a few times a year after months standing is the realistic failure.
This listing does not publish a low-oil shutdown either, though the GX270 carries one as standard — which is a gap in the page rather than the machine.
There is one more thing worth knowing about the CRX listing: its description reads “The SIMPSON PowerShot 4000 PSI at 3.5 GPM… The PS60869 features a commercial SIMPSON 420 engine.” Those are this machine’s figures and this machine’s model number, on that listing’s page, attached to the wrong engine.
AAA industrial triplex plunger, with thermal relief and direct drive.
The division across the shelf is exact:
Axial cam — three Westinghouse machines and the DeWalt: driven straight off the crankshaft, cheap, sealed, rated in the low hundreds of hours.
Triplex plunger — all five Simpsons: three pistons on their own crankshaft, slower and cooler, with replaceable seals, rated in the thousands of hours.
“Maintenance-free” appears on both types and means different things. On an axial cam it means unserviceable. On a triplex it means the crankcase oil is filled for life while the seals and valves remain replaceable.
Thermal relief dumps water before recirculation cooks the seals — because when you release the trigger the pump keeps turning with water trapped inside, and that is the commonest way any of these pumps dies. The three Westinghouse machines publish none; the DeWalt does.
What this listing does not publish, unlike the three smaller Simpsons, is an integrated unloader — the valve that diverts flow at the pump when the trigger is off. Its “Direct Drive” note is the related fact: the pump turns at engine speed rather than through a gearbox, which is simpler and runs hotter than a belt-driven arrangement.
PowerBoost Technology — “delivers higher pressure at the nozzle” — appears here, on the CRX and on the Aluminum 3600, and is explained on none of them.
120 pounds in the bullet, 54,431 g in the catalog — which is 120.0 lb exactly, the only perfect agreement between bullet and catalog on this shelf. The ALH4240 publishes 133 lb against a catalog 56,245 g, which is 124 lb.
Where it sits: Westinghouse WPX3000 22,997 g (811.2 oz) · PowerSmart 27,669 g (976 oz) · WPX3200 28,576 g (1008 oz) · WPX3400 28,600 g (1008.8 oz) · DeWalt 29,030 g (1024 oz) · PS61002 33,021 g (1164.8 oz) · PS3228 33,929 g (1196.8 oz) · Aluminum 3600 35,834 g (1264 oz) · this 54,431 g (1920 oz) · ALH4240 56,245 g (1984 oz) · CRX 4400 61,235 g (2160 oz)
What makes 120 lb workable is the 13 inch premium pneumatic tires, which the three heaviest Simpsons all use where the lighter ones use 10 inch. A bigger wheel rolls over gravel and climbs a curb with far less effort.
The three Westinghouse machines use 12 inch never-flat solid wheels, which cannot puncture and never need air — but skid on gravel and send every bump into the frame. At 23 to 29 kg (50.7 to 63.9 lb) that is a reasonable trade; at 54 kg (119 lb) it would not be.
What 120 lb rules out is lifting it alone into a van or up steps. And the published 38 × 23.5 × 29 inch footprint is worth measuring against your garage before ordering — four listings on this shelf publish no dimensions at all.
0°, 15°, 25°, 40° and soap, with an ergonomic spray gun and the 31 inch wand.
Nine of eleven listings here supply five tips; the Westinghouse WPX3000 supplies four, dropping the 15°.
At 4000 PSI the 0° tip deserves the caution no listing on this shelf gives. A zero-degree nozzle has no fan: it is a pencil jet that cuts flesh, carves grooves in decking in one pass, and drives mortar out of brickwork. Simpson’s own phrase for the set — covering “tasks from stripping paint to car cleaning” — is accurate, and stripping paint is precisely the 0° and 15° job.
Use the 25° for most work and the 40° on anything painted or wooden.
And note what this gun does not have: a safety lock-out. Only the Aluminum Series 3600 at $729.99 and the ALH4240 at $1448.99 publish one on this shelf. At 4000 PSI with a 0° tip fitted, a gun set down on a frame with the engine running is a real hazard.
No warranty. The three Westinghouse machines publish “3-Year Limited Service, Labor, and Parts Coverage with Nationwide Customer Service and Support Network”. All five Simpsons, the DeWalt and the PowerSmart publish nothing — on a machine at $829.94.
No low-oil shutdown, as above.
No integrated unloader, which the three smaller Simpsons publish.
No safety lock-out on the gun.
No soap tank or detergent route. Two Westinghouse machines publish a “Half Gallon Onboard Soap Tank”; this publishes a soap nozzle and nothing about where the soap comes from — which on a machine for “deck cleaning, wood restoration, paint preparation” is a practical omission, since those jobs start with a chemical.
No PWMA certification, which only the PowerSmart at $259.99 claims — the single independently verified PSI figure on this shelf.
No fuel tank capacity, which all three Westinghouse listings publish.
And not for sale in California, as with all five Simpsons here.
Read on the day this page was built: $830 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-04. The live price is at the top of the page.
| Output | 4000 PSI at 3.5 GPM — 14,000 cleaning units |
|---|---|
| Engine | Honda GX270 — a real Honda, where the dearer CRX uses a house engine |
| Hose | 3/8 inch by 50 foot Monster, kink and abrasion-resistant |
| Pump | AAA industrial triplex plunger with thermal relief, direct drive |
| Wand | 31 inch steel — nearly twice the 16 inch wands on the smaller Simpsons |
| Tires | 13 inch premium pneumatic |
| Weight | 120 pounds per the bullet, and 54,431 g (1920 oz) per the catalog — exact agreement |
| Dimensions | 38 × 23.5 × 29 inches, published |
| Drive | Direct drive, stated explicitly |
| Connection | Threaded M22 |
| PowerBoost | Claimed to deliver higher pressure at the nozzle, with no explanation |
| Low-oil shutdown | Not published here, though the Honda GX270 carries one |
| Warranty | Not published |
| Amazon reference | B07S7H6LGM |
| EAN | 0879399002748 |
Because flow is what moves dirt rather than loosening it, and this is the first machine on the shelf to have real flow. Pressure cuts; flow rinses. At 2.5 GPM you break the grime off a driveway and then push it slowly towards a drain; at 3.5 GPM it goes. In cleaning units — PSI × GPM, the industry measure no listing here publishes — this is 4000 × 3.5 = 14,000, against 9000 for the Simpson Aluminum 3600 at $729.99 and 8840 for the Westinghouse WPX3400 at $349. So this does fifty-five per cent more work per minute than the next Simpson down. It also unlocks the accessory that matters: a surface cleaner has no motor, and its two nozzles are spun by the water leaving them, so flow turns the head. Most want 2 GPM minimum, and a twenty inch head — the widest sold — needs real volume to spin properly. At 3.5 GPM this will drive one. The cost is water: 3.5 gallons a minute is 210 gallons an hour, which on a metered supply is a figure worth knowing.
Because it spends its money on output instead. The Simpson CRX 4400 at $899.99 publishes 4400 PSI at 4.0 GPM — 17,600 cleaning units against this machine’s 14,000 — and runs Simpson’s own "CRX 420cc premium engine". This runs a Honda GX270. The difference matters on two counts. Parts and service: a Honda GX is the most widely serviced small engine family in the world, and a carburettor or gasket set is available anywhere. A CRX is Simpson’s own. Low-oil shutdown: the CRX listing does not publish one, where the three Honda GX200 Simpsons on this shelf all do, and so does the DeWalt at $429. A low-oil cutout stops the engine before it seizes, which on a machine used a few times a year is the realistic failure. Worth adding that the CRX listing has a further problem: its description reads "The SIMPSON PowerShot 4000 PSI at 3.5 GPM... The PS60869 features a commercial SIMPSON 420 engine" — which is this model’s figures on that listing’s page, attached to the wrong engine.
On a drive, yes; into a car, no — and this is the first machine on the shelf where that becomes the real constraint. The bullet publishes "120 pounds" and the catalog publishes 54,431 g (1920 oz), which is 120.0 lb exactly — the only perfect agreement between bullet and catalog on this shelf. The machines below it run 22,997 g (811.2 oz) (Westinghouse WPX3000) to 35,834 g (1264 oz) (Simpson Aluminum 3600); the two above it are 56,245 g (1984 oz) and 61,235 g (2160 oz). What makes 120 lb workable is the 13 inch premium pneumatic tires, which the three heaviest Simpsons all use where the lighter ones use 10 inch: a bigger wheel rolls over gravel and climbs a curb with far less effort. The three Westinghouse machines use 12 inch never-flat solid wheels instead, which cannot puncture but skid on gravel and transmit every bump. What 120 lb rules out is lifting it alone into a van or up steps, and the published 38 × 23.5 × 29 inch footprint is worth measuring against your garage before ordering.
Measured against the median of its own aisle here — not against everything on sale.
cleaning machines from the same category, at nearby prices. Only what all of them publish is shown: a column with holes compares nothing.
| Model | Price | Engine | Hose | Pump | Tires |
|---|---|---|---|---|---|
| Simpson PS60869 | $830 | Honda GX270 — a real Honda, where the dearer CRX uses a house engine | 3/8 inch by 50 foot Monster, kink and abrasion-resistant | AAA industrial triplex plunger with thermal relief, direct drive | 13 inch premium pneumatic |
| Simpson 60843 | $900 | CRX 420cc — Simpson’s own, not a Honda, see the FAQ | 3/8 inch by 50 foot Monster with quick connect fittings and a polyurethane jacket | AAA industrial triplex plunger with thermal relief and PowerBoost | 13 inch premium pneumatic |
| Simpson 60689 | $730 | Honda GX200 with low-oil shutdown | 35 feet, Morflex 5/16 inch, non-marring and abrasion-resistant | AAA triplex plunger with an integrated unloader, thermal relief and PowerBoost | 10 inch premium pneumatic |
| SIMPSON PS3228 | $660 | Honda GX200 with low-oil shutdown | 5/16 inch by 25 foot Morflex — the bore is published, which its twin omits | Maintenance-free AAA triplex plunger with an integrated unloader and thermal relief | 10 inch premium pneumatic |
Details checked on October 4, 2026.
A long driveway, a large house, or paid work — where flow is the figure that matters
Amazon reports what buyers took in the month before this page was last checked: at least 100.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for cleaning machines and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
2,200 PSI (≈ 152 bar) · 2.3 GPM · single-cylinder air-cooled
The most modest petrol machine here, and the only one listed on all six Amazon stores.
Best for: Large gardens and outbuildings without power, where 150 bar is plenty
170–190 bar · 3,400 rpm · axial cam pump · self-priming
A modest pressure range honestly stated, on an axial pump — the entry to petrol here.
Best for: Occasional work away from a socket — a smallholding, a boat yard, a second property
234 bar working · 590 l/h · 5.9 hp four-stroke · 9 m (30 ft) hose
The only machine on this site that publishes a working pressure and a flow rate together.
Best for: Farmyards, contractors and large properties without power at the far end
