We checked live Amazon listings and manufacturer sites for five pressure washers from Ryobi, Sun Joe, Greenworks, Simpson and Karcher, comparing PSI, GPM and real customer ratings.
Sun Joe
Why we like it
Ryobi
Why we like it
Greenworks
Why we like it
Simpson
Why we like it
Karcher
Why we like it| Product | Rank | Brand | Best For | Score |
|---|---|---|---|---|
| Sun Joe SPX3000 2030 PSI 1.76 GPM 14.5-Am... | #1 | Sun Joe | Best Overall / Most-Reviewed | 9.8 |
| RYOBI RY80589 3300 PSI 2.4 GPM Cold Water... | #2 | Ryobi | Best for Heavy-Duty Driveway & Siding Jobs | 9.6 |
| Greenworks 2300 PSI (1.2 GPM) Brushless E... | #3 | Greenworks | Best for Fast Rinse-Down | 9.4 |
| Simpson Cleaning MegaShot MSH3125 3300 PS... | #4 | Simpson | Best with Bundled Surface Cleaner | 9.3 |
| Karcher K5 Premium 2000 PSI Electric Powe... | #5 | Karcher | Best Compact Electric with Onboard Storage | 9.1 |
Buyer checklist
This is desk research, not a hands-on side-by-side pressure test — we did not run these five washers against each other on the same driveway. For four of the five products (Sun Joe, Greenworks, Simpson, Karcher) we pulled the real Amazon.com listing using cached Wayback Machine snapshots to retrieve rating data and feature bullets, confirmed the ASIN resolves to a real, current listing, and read each manufacturer's own feature bullets and star rating/ratings count where visible. The Ryobi entry is a deliberate exception worth disclosing directly: its current model (RY80589) is new enough that we could not locate any Wayback Machine snapshot of its Amazon listing, and Internet Archive access was intermittent during this research. Rather than substitute an older, discontinued Ryobi model (we confirmed the prior RY803001 is explicitly listed as discontinued) or fabricate a rating, we pulled the product image and specifications directly from Ryobi's own current product page at ryobitools.com. This means the Ryobi entry has no Amazon star rating or review count in this guide — check the live Amazon listing directly for current customer feedback before buying. Two of the five original draft products required an ASIN swap during research: the Greenworks and Simpson listings we initially targeted had no retrievable Wayback snapshots, so we substituted a closely comparable model from the same product line (same core engine/motor and PSI class) and verified that alternate ASIN's snapshot instead. Each swap is disclosed in that specific product's checks below. PSI and GPM ratings are measured under each manufacturer's own test conditions and aren't always directly comparable across gas and electric designs — a gas unit's higher PSI ceiling doesn't automatically mean faster real-world cleaning than an electric unit with strong GPM flow, since cleaning speed depends on both figures together plus the nozzle and surface cleaner attachments used.
It depends on the job. Gas washers like the Ryobi and Simpson in this guide typically reach higher PSI (3000-3300 here) and aren't tethered to an outlet, making them better suited to large driveways, siding jobs, or anywhere far from power. Electric washers like the Sun Joe, Greenworks and Karcher here are quieter, need no fuel or engine maintenance, and are generally sufficient for decks, patio furniture, cars, and smaller driveways at lower PSI (2000-2300).
Not by itself. GPM (gallons per minute) matters just as much, since it's the combination of pressure and flow that actually clears dirt and grime — a washer with strong GPM at moderate PSI, like the Greenworks' Jet Flow Technology in this guide claiming 50% more flow area, can rinse a surface faster than raw PSI alone would suggest. Check both figures together rather than PSI in isolation.
Per Simpson's own description of the bundled 15-inch surface cleaner included with the MegaShot in this guide, it uses two rotating jets under a circular housing to clean flat surfaces like driveways and patios roughly three times faster than a standard spray wand, by covering a wide swath in even, overlapping passes instead of the streaky pattern a handheld wand tends to leave.
Because its current model (RY80589) is new enough on Amazon that no Wayback Machine snapshot of that specific listing was available to us at research time, and we chose not to substitute an older discontinued Ryobi model just to have a rating to cite. We sourced its specs and image directly from Ryobi's own product page instead — check the live Amazon listing for current customer ratings before buying.