Sun Joe SPX3500 Electric Pressure Washer
We designed the Sun Joe SPX3500 to deliver 2300 PSI of cleaning power for homeowners who need professional results without the noise and maintenance of gas engines. This electric pressure washer runs on a 14.5-amp motor that generates 1.48 GPM of water flow, giving you the muscle to strip years of grime from concrete driveways, wooden decks, vinyl siding, and vehicles.
The SPX3500 ships with five quick-connect spray tips—0°, 15°, 25°, 40°, and a soap nozzle—so you can dial in the right pressure for every surface. Two 0.9-liter onboard detergent tanks let you switch between cleaning solutions mid-job without stopping to refill. The 20-foot high-pressure hose and 35-foot power cord give you a 55-foot cleaning radius from any outlet.
Our Total Stop System automatically shuts off the pump when you release the trigger, extending motor life and reducing energy waste. The SPX3500 weighs 31 pounds and rolls on two wheels with a telescoping handle for easy transport across your property.
Core specs & attachments
Motor & Pressure Output
The SPX3500 runs on a 14.5-amp brushless induction motor that peaks at 2300 PSI with 1.48 gallons per minute of flow. That combination strips oil stains from garage floors, lifts mildew from deck boards, and blasts mud off ATV tires without the kickback you’d get from a 3000 PSI gas unit.
Our thermal sensor cuts power if the motor starts to overheat, which typically happens only if you run the machine dry or block the nozzle. The same electric architecture powers our SPX3000 model, though the SPX3500 adds dual detergent tanks and an extra 100 PSI for tougher jobs. Both models plug into standard 120V household outlets and start with a single trigger pull.
Nozzle Selection & Detergent System
Five color-coded quick-connect tips ship in the onboard storage: red 0° for spot-blasting rust and paint, yellow 15° for concrete and brick, green 25° for wood decks and fences, white 40° for windows and vehicles, and black soap nozzle for pre-treating with detergent.
The dual 0.9-liter tanks sit side by side on the unit with a rotating selector dial. Load one tank with heavy-duty degreaser for your driveway and the other with vehicle wash for your cars, then twist the dial mid-job to switch formulas without draining or refilling. The soap nozzle draws from whichever tank you’ve selected and mixes it into a low-pressure foam stream.
Hose, Cord & Mobility
The 20-foot high-pressure hose connects to the spray gun with a quick-coupler that clicks into place without tools. Add the 35-foot power cord and you get a 55-foot working radius from your outlet, enough to reach the back corner of most driveways or walk the perimeter of a two-story house without moving the machine.
Two 7.5-inch plastic wheels and a 34-inch telescoping handle let you roll the SPX3500 up front steps or across gravel. The handle locks at three heights so users from five to six feet tall can pull it comfortably. Total shipping weight is 31 pounds; the unit measures 16.5 × 13.5 × 32 inches when the handle is fully extended.
Electric Pressure Washers for Every Job
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Common Questions About the SPX3500
The SPX3500 delivers 2300 PSI compared to the SPX3000's 2030 PSI, giving you about 13% more cleaning power for stubborn stains. Both models include dual detergent tanks and five quick-connect nozzles. The SPX3500 also ships with a slightly longer hose and a 20-ounce bottle of Pressure Joe cleaner, while the SPX3000 includes two smaller sample bottles.
If you're cleaning mostly vehicles and decks, the SPX3000 has plenty of power. Choose the SPX3500 if you regularly tackle oil-stained concrete or need to strip old paint from masonry.
Yes, use the white 40° nozzle and keep the tip at least 12 inches from the paint surface. The wider spray pattern disperses the pressure across a larger area, dropping the effective PSI at the surface to around 500—safe for automotive clear coat.
Switch to the soap nozzle first to pre-treat with car wash solution from one of the detergent tanks. Let it dwell for two minutes, then rinse with the 40° tip. Avoid the red 0° and yellow 15° nozzles on painted surfaces—they can strip clear coat and chip paint.
We recommend taking a five-minute break after every 30 minutes of continuous trigger time to let the motor cool. The thermal sensor will automatically shut down the unit if it detects overheating, usually caused by running the pump dry or using an extension cord that's too thin.
For jobs longer than an hour, use a 14-gauge or thicker extension cord rated for 15 amps. Standard 16-gauge cords cause voltage drop that forces the motor to work harder and heat up faster.
Yes, if your garage drops below 32°F in winter you need to pump antifreeze through the system. Disconnect the hose, pour RV antifreeze into the detergent tanks, and run the pump for 30 seconds to push it through the lines and out the spray gun.
Ice trapped inside the pump housing will crack the seals and void your warranty. Alternatively, bring the unit indoors to a heated basement or mudroom for winter storage.
Use a standard 5/8-inch garden hose with at least 1.5 GPM flow from your spigot. The SPX3500 draws 1.48 GPM, so a typical residential water line has plenty of volume.
A 1/2-inch hose will restrict flow and trigger the thermal shutoff because the pump runs dry. If you see pressure dropping mid-job, check that your supply hose isn't kinked and that the inlet filter isn't clogged with sediment.
The SPX3500 requires a pressurized water source—it's not self-priming and won't pull water uphill from a bucket. You need at least 20 PSI from your garden hose connection to feed the pump inlet.
If you want to use rainwater, you'll need a separate transfer pump to push water from your barrel into the pressure washer at the required flow rate. Most users find it simpler to connect directly to a spigot.
Use any pressure washer detergent labeled safe for electric pumps. Our Pressure Joe line is formulated specifically for Sun Joe models, but third-party brands like Simple Green and Krud Kutter work fine.
Avoid bleach, muriatic acid, and chlorine-based cleaners—they corrode the brass fittings and rubber seals inside the detergent injection system. Stick to pH-neutral or mildly alkaline formulas and always flush the tanks with clean water after every job.