Greenworks 40V Cordless Pressure Washer Review (2026): The First Battery Washer We Would Recommend Without an Asterisk

Why this product

The 40V cordless class has a credibility problem. Most battery pressure washers we have tested in the past three seasons have been bike-rinse tools at best, regardless of marketing copy. The Greenworks 40V is the first one that meaningfully steps up. At 1100 PSI and 0.8 GPM rated flow, it sits between the Sun Joe 24V cordless and the corded SPX3000 on a power curve, and it converts that headroom into real cleaning.

I ran the Greenworks across a 200 sq ft brick patio that had not been touched in two years, a 60 ft cedar fence panel run, an RV roof soft rinse, and our standard car wash test. The patio is the headline. The 25 degree tip cut through algae and cleaned bricks back to color at a slow walk pace, then the soap tip handled detergent dwell on a fresh full battery. That work is plausible on this unit. It is not plausible on most cordless pressure washers under $200.

What Greenworks claims

Greenworks markets the 40V cordless at 1100 PSI and 0.8 GPM, fed from the G-MAX 40V platform with a 4 Ah lithium-ion pack. The kit includes a 16 ft pressure hose, a quick-connect wand, three fan tips (15, 25, 40), a soap nozzle, a 20 ft garden hose adapter, and a bucket suction kit for off-grid water draw. They claim about 25 minutes of runtime per 4 Ah charge.

In practice the runtime claim was honest. We measured 24:40 on average across three full-trigger runs at 70 F with the 25 degree tip. Working pressure at the wand on a 50 PSI inlet ran about 1020 to 1080 PSI which is normal pump-to-trigger pressure drop. Bucket draw dropped working pressure to about 940 PSI which is consistent with how venturi inlet draw behaves on lower-priced pumps.

Who should buy

Buy the Greenworks 40V cordless if:

• You already own Greenworks 40V tools and want to share batteries.
• You clean patios, fences, and outdoor furniture in places without convenient outlets.
• You want real cordless cleaning power, not just rinse.
• You value the longer 4 year tool warranty.

Skip the Greenworks 40V if:

• You have outlet access at your work area. The corded SPX3000 cleans almost twice as fast for $40 less.
• You only need short cleanup on bikes or kayaks. The cheaper Sun Joe 24V cordless is the right call.
• You expect to strip a deck. Even at 1100 PSI, the GPM and runtime ceiling make deck stripping a frustrating job.

Cleaning power: surprisingly real for a cordless

The 25 degree fan tip is the workhorse on this unit. On a 200 sq ft brick patio it cleared algae at a slow walk and showed visible cleaning lines that disappeared under a second pass. On a 60 ft cedar fence run, soap dwell with the included nozzle plus the 25 degree rinse stripped two seasons of mildew across roughly 18 minutes of trigger time. We charged batteries twice during that fence job, which is the right cadence for a 4 Ah pack on real work.

On a Subaru Forester, the 40 degree tip handled rinse, the soap nozzle handled foam dwell, and the 25 degree tip handled the bug-and-grit zones at the front. Total wash time was about 19 minutes which is right between the corded SPX3000 (faster) and the 24V cordless (slower). For our complete testing protocol see The Tested Hub methodology page.

Battery and runtime: 25 minutes is the real number

The runtime ceiling is the limit you will plan around. A 4 Ah pack at 70 F gives you about 25 minutes of trigger time. With realistic on-off cycles a 200 sq ft patio takes one full charge plus most of a second. A small fence run takes one charge. A car wash takes one charge with margin. If you have one battery, your sessions cap at about 30 minutes wall to wall. With two batteries the unit becomes genuinely full-shift capable.

The 4 year tool warranty and 2 year battery warranty are above average for the cordless class. Sun Joe ships 2 and 2 on most of their cordless line. That extra two years on the tool is meaningful given the relatively young state of cordless pump engineering.

Build and durability

The cart is plastic, the wheels are small and rigid, and the feet flex on gravel which means uneven ground will rock the unit during heavy trigger pulls. None of that affected cleaning, but it is worth knowing if your patio sits on pavers with a slope. The hose connections are brass and held pressure cleanly across the season. Battery capacity after the season tested at about 94 percent of day-one runtime, which is consistent with normal lithium-ion cycle wear at low duty cycles.

The unit operates noticeably quieter than the corded SPX3000. We measured roughly 78 dB at 1 meter at full trigger compared to about 86 dB on the SPX3000. Cordless pressure washers tend to be quieter because they use lower amp brushless motors, and the Greenworks fits that pattern.

Greenworks 40V Cordless Pressure Washer vs. the competition

Full specifications

Frequently asked questions

Author

Riley Cooper

Garden & Outdoor Editor

Riley Cooper writes for The Tested Hub.

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