How Many Watts Does a Pressure Washer Use?

How many watts does a pressure washer use?

An electric pressure washer uses about 1,200 to 1,800 watts, or roughly 13 to 15 amps on a 120-volt outlet, while a gas pressure washer draws almost no electricity because the gas engine does the work. Almost every home electric model runs on a standard 120-volt plug; you do not need a special circuit for a typical unit.

Here is the rough wattage by class. Compact or entry electric washer: about 1,200 to 1,500 watts (11 to 13 amps), making roughly 1,500 to 1,900 PSI. Mainstream home electric washer: about 1,500 to 1,800 watts (13 to 15 amps), making roughly 2,000 to 2,300 PSI; a popular example, the Sun Joe SPX3000, draws about 14.5 amps, near 1,800 watts. Prosumer induction units can still sit near 1,800 watts but squeeze more pressure out of it, up to about 2,900 PSI. A gas pressure washer: 0 watts of household power, the same fuel-does-the-work split you see with a gas dryer or a gas smoker.

A 15-amp electric washer pulling about 1,800 watts sits right at the continuous ceiling of a normal 120-volt, 15-amp circuit, so give it its own outlet rather than sharing. The biggest prosumer or light-commercial electric units can call for a dedicated 20-amp circuit or even 240 volts, but those are the exception; the washer in most garages is plain 120-volt, 15-amp.

Universal motor vs induction motor: why it changes the startup surge

Electric pressure washers come with one of two motor types, and which one you have decides how much startup surge it has and how long it lasts. This is the single biggest factor in sizing a generator or inverter for it, and it is why two washers rated at the same 1,800 watts can behave very differently when you switch them on.

A universal (brushed) motor is what most budget units under about $200 use. It is light, cheap, spins at very high RPM, runs loud, and wears out sooner, but it spins up fast with only a brief inrush, much like the universal motor in a corded vacuum. An induction motor is heavier, quieter (often around 65 decibels), and far more durable, which is why prosumer and wall-mounted units use it, but it draws a locked-rotor startup surge of about 2 to 3 times its running watts the instant it kicks on, the same behavior as the induction motor in a well pump or pool pump.

So a pressure washer sits between a vacuum and a well pump. A universal-motor washer is an easy start; an induction-motor washer briefly demands two to three times its rated watts. If you only ever plug into the wall, this barely matters, because the circuit handles the fraction of a second it lasts. It matters a lot the moment you try to run the washer off a generator or a battery, covered further down.

Why the motor only runs while you squeeze the trigger

A pressure washer does not run continuously the way a vacuum does; it only pulls full power while you hold the trigger on the wand. Let go, and one of two things happens, which is why the average draw over a job is lower than the rated wattage suggests.

Most consumer units use a Total Stop System (TSS): release the trigger and the motor shuts off within a second, then restarts when you squeeze again. Others use an unloader or bypass valve, where the motor keeps spinning but the pump recirculates water at low load until you pull the trigger. Either way, over a real wash you are actually on the trigger maybe half to two-thirds of the time, moving the wand, swapping nozzles, and mixing soap the rest. That means the average power draw and the total kilowatt-hours are below the rated watts times the wall-clock time.

The one catch is on a TSS unit with an induction motor: every trigger release and squeeze is a fresh motor start, so it hits that 2-to-3-times surge over and over. On the wall that is invisible. On a generator or inverter sized too tightly, those repeated surges are exactly what cause stalls and nuisance trips, so size for the surge, not the running watts.

Does more watts mean more cleaning power?

Yes. Unlike a vacuum, where the amps and air watts on the box do not track how well it cleans, a pressure washer's wattage roughly does track cleaning power, because cleaning power is pressure (PSI) times flow (GPM), and it takes more motor power to make both. An 1,800-watt unit producing around 2,000 to 2,300 PSI and 1.3 to 1.5 GPM genuinely out-cleans a 1,200-watt one; the extra watts are buying you real pressure and flow, not just a bigger number.

That said, do not simply chase maximum PSI. The nozzle, the detergent, and how close you hold the wand matter as much as raw pressure, and too much pressure gouges wood, cracks vinyl siding, and strips paint. Is 1,800 PSI enough to power wash a house? Yes, for vinyl and painted siding with a wide 25- or 40-degree nozzle or a soap tip, and the GPM (how fast you rinse) matters as much as the PSI. The higher-PSI gas machines are for concrete, driveways, and paint stripping, jobs where an electric unit is slower but a 2,000-PSI electric still handles most home siding and decks.

On the electrical side, that 11-to-15-amp draw runs on any 120-volt, 15- or 20-amp outlet, but a 15-amp washer wants its own circuit. Running it at the same time as another heavy load on the same line will trip the breaker, the same stacking problem that catches space heaters and other high-draw tools.

How much does it cost to run an electric pressure washer?

Very little, usually just pennies per job, because you use a pressure washer occasionally and the motor only runs while the trigger is down. A 1,500-watt washer with about 30 minutes of actual trigger time uses roughly 0.75 kilowatt-hours, about 13 cents at the 2026 US average rate near $0.17 per kilowatt-hour. You can turn any wattage into a bill with our watts to kWh guide.

A longer session, say two hours spent washing a driveway and a deck with the trigger down maybe half the time, comes to roughly 1.5 kilowatt-hours, about 25 cents. Even washing something most weekends adds up to only a dollar or two a month. Treat these as estimates; your electric rate and how long you actually hold the trigger move them around (see our disclaimer).

In other words, a pressure washer is an occasional load, not a bill mover. Its energy cost disappears next to heating, cooling, and hot water, which you can see in context in our whole-house wattage guide. The reason people ask about its power is almost never the bill; it is whether a generator, inverter, or solar battery can start it.

What size generator do you need, and can solar run a pressure washer?

For an electric pressure washer, size the generator or inverter to the startup surge, not just the running watts; for a gas pressure washer you need no generator at all, because the engine runs on fuel. That distinction is the source of most of the confusion: people ask whether a generator can run a pressure washer without saying which kind they have.

Can a 2,000-watt generator run a pressure washer? A 2,000-watt running generator can handle a smaller 1,200 to 1,500-watt (11 to 13-amp) electric washer, but it is marginal for an 1,800-watt (14.5 to 15-amp) unit, especially one with an induction motor whose surge spikes well above 2,000 watts at switch-on. The rule of thumb: for a universal-motor washer, about 1.5 times the running watts (a 1,500-watt washer wants roughly a 2,500-watt generator); for an induction-motor washer, about 2 to 3 times for the surge (an 1,800-watt induction unit wants a 3,500 to 4,000-watt generator). A TSS unit restarts every time you squeeze the trigger, so the generator sees that surge again and again.

On solar, the same rule applies: the limit is the inverter's continuous and surge rating, not its battery capacity. A pure sine power station rated around 2,000 watts continuous runs a universal-motor washer; an induction unit wants a station with a bigger surge rating. Capacity is rarely the problem, because a 12-volt 100Ah battery holds about 1 kilowatt-hour, which covers the short total trigger time of a whole job (see what a 100Ah battery can run). You also tend to wash in daylight, so it is a reasonable daytime-solar match on a mid-size station. Size a real system with the solar panel calculator, and for a station that can also run other tools, compare options in our best solar generators guide. One safety note that doubles as a performance tip: electric washers ship with an inline GFCI in the cord for outdoor outlets, so do not defeat it, and avoid a long thin extension cord, because the voltage drop strains the motor, trips the GFCI, and overheats the cord; use the shortest, heaviest outdoor-rated cord you can, or plug straight into the wall.

Frequently asked questions