This is the most instructive comparison on the site, because the two machines are close in price and differ on the thing that actually matters. One has features. The other has flow.
Where they differ
| | Westinghouse ePX3500 | Sun Joe SPX3000 |
|---|
| Catalog pressure | 2,500 max PSI | 2,500 max PSI |
| Catalog flow | 1.76 max GPM | Not stated in listing |
| Detergent | Single | Two onboard tanks |
| Frame | Anti-tipping technology | Standard upright, tips easily |
| Surface cleaner size it will drive | Up to 14 inches properly | 11 inches comfortably |
Why the flow figure decides it
Same headline pressure, and the Westinghouse states 1.76 max GPM while the Sun Joe listing does not publish a flow figure at all. In practice that difference shows up in three places: how fast soap rinses off a wall, whether a 14-inch surface cleaner spins at full speed, and how long a driveway takes.
If you have any flat concrete at all, that is the whole argument. More water is what finishes driveways; see PSI vs GPM for the arithmetic, and the driveway picks for the same logic applied across the range.
The anti-tipping thing is not marketing
Every upright electric pressure washer gets pulled over by its own hose. It happens when you walk round a corner, and it happens often. The Sun Joe tips readily on its small wheels; the Westinghouse frame is designed against it. A unit that falls onto concrete dozens of times over a few seasons fails sooner, and this is a genuine durability difference rather than a feature bullet.
Where the Sun Joe still wins
Two tanks. If you clean several different things — siding, then the car, then the deck — keeping two detergents loaded is a real convenience the Westinghouse does not offer.
Price and ubiquity. The SPX3000 is frequently cheaper, spares and tips for it are everywhere, and it is the most documented first pressure washer there is. If budget is the binding constraint, it is a completely reasonable machine — the full review says so.
Which I would buy
The Westinghouse ePX3500, for anyone with concrete. The flow is the thing that changes what the machine can do, and the frame fixes the main durability complaint about this whole class of unit.
The Sun Joe SPX3000 if your jobs are the car, the furniture and a small patio, where 1.76 GPM buys you nothing and two tanks buy you convenience — or if it is on sale and the Westinghouse is not. Check the live prices on both; at this end of the market the answer moves.
