The five things that matter away from home
1. Flow rate, because flow is time
In your own driveway an extra two minutes of rinsing costs nothing. On a paid job it is the margin. Flow rate — gallons per minute — is what sheets foam and dirt off a panel; pressure concentrates force on a small area, which on paint is the hazard rather than the feature. Detailer guidance puts the safe window for washing paint at roughly 1,200–1,900 PSI, so above that you are not buying speed, you are buying risk. Our PSI guide for cars covers why.
Flow is also what decides foam. Chemical Guys publishes a 1.4 GPM minimum and a 2.0 GPM recommendation for the TORQ Max Foam 8, which is the mainstream reference cannon. The Active 2.0 hits the recommendation exactly; the Greenworks 2300 publishes up to 2.3 GPM and clears it; the Sun Joe SPX3000 at 1.76 GPM is between the two figures. Nothing here is guesswork — see the PSI and GPM a cannon needs.
2. Where the water comes from
This is the question that actually sorts the list, and it has a hard answer. A mains-fed electric pressure washer needs a pressurised supply at its inlet; it will not suck water out of a drum. If the sites you work do not have a usable outdoor tap, your options are a cordless unit that draws from an open source, or a corded machine plus a separate feed pump and tank — which is a different purchase conversation.
Both cordless picks in our registry publish “bucket / jug / open source” as a water source, and that capability is the reason either is on the list at all. Our cordless roundup is the full set, and washing a car without a driveway covers the no-water, no-hose case properly.
3. Fittings, because a mismatch wastes a job
Consumer washers ship with proprietary or semi-proprietary connections, and discovering that on site is expensive. Two things to check before you buy:
- The outlet thread. M22 is the de-facto standard, but M22 comes in 14mm and 15mm inner stems that will thread together and still leak. The Active 2.0 publishes M22-14mm, which is the common aftermarket size.
- The cannon connection.Most cannons use a 1/4-inch quick-connect. Kärcher K-series machines use a bayonet instead, and the K1600–K2300 units need the quarter-inch model rather than the bayonet — a split the cannon makers publish themselves. Our cannon fitment decision guide walks through it, and the fitment reference lists the adapters.
4. Hose and cord length, because you cannot move the building
At home you position the machine once. On a job you are working around parked cars, kerbs and whoever else needs the outlet. A 25-foot hose on a reel — which is what the Greenworks 2300 publishes — is worth more than a spec-sheet improvement anywhere else, because every foot of hose is a foot you do not have to carry the machine. The Sun Joe SPX3000 publishes only a 20-foot hose and a 34-foot cord, which is the single most common complaint about an otherwise excellent cheap washer.
5. Duty cycle, honestly stated
None of these units publishes a duty-cycle rating, and we will not invent one. What we can say is what the makers do publish: the Active 2.0 states a patented five-piston pump and a two-year residential warranty — note the word residential. The others publish no warranty term on their listings at all. If you are washing four cars a day, five days a week, you are outside what any consumer electric was designed and warranted for, and you should budget for replacing the machine rather than assuming it will last.
The picks compared
| | Flow | Pressure | Water source | Notable fitting / reach |
|---|
| Active 2.0 | 2.0 GPM | 1800 PSI (peak) | Mains tap | 3/4" inlet, M22-14mm outlet; 24 lb |
| Greenworks 2300 | Up to 2.3 GPM | 2300 PSI | Mains tap | 25 ft hose on a reel |
| Worx Nitro Hydroshot | Not published | 710 PSI | Bucket, jug or open source | 20V Power Share battery |
| Sun Joe SPX3000 | 1.76 GPM | 2030 PSI | Mains tap | 20 ft hose, 34 ft cord; 5 tips |
What to spend the rest of the budget on
A better machine is rarely the thing that improves a mobile wash. The order that actually matters:
- A proper foam cannon.A pre-soak is the biggest single scratch-reducer in the process, and an onboard soap tank cannot produce clinging foam — here is why. Our cannon ranking is the shortlist.
- Two buckets and grit guards.The cheapest insurance against putting swirls into a customer’s paint, and the fastest way to lose a repeat client if you skip it. See the two-bucket method and grit guards.
- Drying you can do fast and safely. Streaks are what the customer notices. A plush drying towel on panels and a blower for trim and wheels is the routine that stops water running out of mirrors ten minutes after you leave.
- A pH-neutral shampoo you can use on anything.You will not know what protection is on a stranger’s paint. A neutral soap that does not strip a coating removes the guesswork.
Prices, and what we have not done
Live prices and the date they were read are on the cards above; we never type a number into the prose. In rough bands the Sun Joe is the cheapest entry, the Greenworks and the Hydroshot sit in the middle, and the Active 2.0 is the premium of the four.
To be explicit, because this is a page aimed at people spending money to earn money: we have not run these machines commercially, logged hours on them, or measured flow at the nozzle. Every figure above is the manufacturer’s published specification carried in our registry with the date the listing was read, and the “Not published” rows — the Hydroshot’s flow rate, every unit’s duty cycle — are findings rather than omissions. More on that in how we rank.
