A pressure washer without onboard detergent means stopping mid-job to manually scrub soap, and that is exactly what you bought the machine to avoid. The five washers below have verified detergent tanks, cover 1,700 to 3,200 PSI, and range from $110 to $380.
| Photo |
Top Pick
|
Versatile
|
Budget
|
Best Value
|
Best for Reliability
|
|---|---|---|---|---|---|
| Product | Sun Joe SPX3000 Electric Pressure Washer | Westinghouse ePX3500 Electric Pressure Washer | Karcher K1700 Electric Pressure Washer | Ryobi RY141900 2000-PSI Electric Pressure Washer | Simpson Clean Machine CM61456 3200-PSI Gas Pressure Washer |
| Gpm | 1.76 Max | 1.76 Max | 1.2 Max | 1.2 Max | 2.5 Max |
| Psi | 2030 Max | 2500 Max | 1700 TruPressure | 2000 Max | 3200 Max |
| Power | 14.5-Amp | Electric | Electric | 13-Amp | 174cc Gas Engine |
| Detergent tank | Dual 0.9L tanks | 20 oz onboard | 0.5 gal removable | Removable onboard | Onboard soap tank |
| Buy Now | Check Price → | Check Price → | Check Price → | Check Price → | Check Price → |
Quick Tips
Run water through the detergent tank after every use — dried soap residue clogs the injection port and you won't notice until mid-job.
Switch to the low-pressure soap nozzle before applying detergent — using a high-pressure tip with soap wastes solution and can streak surfaces.
Let detergent dwell 2-3 minutes before rinsing — this does more work than extra PSI and prevents having to re-apply.
Test PSI on an inconspicuous spot before blasting car paint or composite decking — 0-degree and 15-degree nozzles can etch soft materials.
Sun Joe SPX3000 Electric Pressure Washer
Best for homeowners who want two soap tanks and versatile nozzle selection
Sun Joe SPX3000 Electric Pressure Washer
Best for homeowners who want two soap tanks and versatile nozzle selection
What we like
- Dual 0.9L detergent tanks let you load two different soap types and switch between them without stopping.
- Five quick-connect nozzles (0, 15, 25, 40-degree, and soap) cover everything from car paint to concrete.
- Total Stop System shuts the pump off automatically when the trigger is released, extending motor life.
- 34-inch extension wand reaches second-story siding without needing a ladder extension.
What we don't
- At 1.76 GPM, rinsing large concrete areas takes longer than higher-flow gas models.
- The plastic fittings on the hose connections feel less durable than the steel fittings on pricier units.
- The 20-foot hose is shorter than competitors at this price point and limits reach without a hose extension.
The SPX3000 solves the most annoying pressure washing problem — switching soaps mid-job — by giving you two separate detergent tanks and a dial to toggle between them. You can load driveway degreaser in one and vehicle soap in the other and move from surface to surface without ever stopping to drain and refill.
This is the right pick if you are cleaning a mix of surfaces in a single session: car, then deck, then driveway. Skip it if your jobs are single-surface and you just need raw GPM — a higher-flow gas unit will finish faster.
Westinghouse ePX3500 Electric Pressure Washer
Best for compact storage with anti-tip stability and onboard soap tank
Westinghouse ePX3500 Electric Pressure Washer
Best for compact storage with anti-tip stability and onboard soap tank
What we like
- Anti-tipping four-wheel steering with 360-degree turn radius makes it easy to drag behind you across different terrain.
- At 16.5 inches tall with a low center of gravity, it stores in tight garage corners where taller units will not fit.
- 2,500 max PSI handles driveway oil stains and mildewed siding that lower-rated electric units struggle with.
- Backed by a 3-year limited warranty covering service, labor, and parts — longer than most competitors at this price.
What we don't
- The 20-oz soap tank is the smallest on this list and requires frequent refills during larger jobs.
- The 25-foot hose is functional but reaches its limit quickly on longer driveways without moving the unit.
- Higher PSI means more caution needed on soft surfaces — easy to etch wood or strip paint if you use the wrong nozzle.
The ePX3500 is the most maneuverable electric washer on this list — the 360-degree wheel system means it rolls with you instead of fighting you every time you change direction, which matters when you are dragging a hose around a car or moving between driveway sections. The 2,500 max PSI gives it more concrete-cutting power than the Sun Joe at the same price tier.
Pick this if storage space is tight and you want a washer that parks compactly and rolls easily. Pass if you need more than 20 oz of detergent capacity per fill — that tank will slow you down on bigger jobs.
Karcher K1700 Electric Pressure Washer
Best for light-duty cleaning and car washing without overkill PSI
Karcher K1700 Electric Pressure Washer
Best for light-duty cleaning and car washing without overkill PSI
What we like
- CETA-certified 1,700 TruPressure rating means the listed PSI is independently verified — not an inflated max figure.
- The 0.5-gallon removable detergent tank is the largest capacity on this list and lifts out for easy refilling.
- Never-flat wheels and a compact footprint make it easy to move and store without dedicated floor space.
- Foot-switch power control keeps your hands on the gun — no reaching back to flip a power toggle mid-job.
What we don't
- 1,700 PSI will not cut through embedded concrete stains or heavily mildewed surfaces the way 2,000+ PSI units do.
- 1.2 GPM flow rate means rinsing takes noticeably longer than higher-flow competitors.
- Only three nozzle tips included — no 25-degree all-purpose nozzle, which most users end up wanting.
The K1700 is for people who actually want a car-washing and light-surface machine — not someone who mistakenly bought underpowered. The independently certified TruPressure rating means 1,700 PSI is real, the 0.5-gallon detergent tank is the biggest removable tank on this list, and the foot switch is a genuinely useful ergonomic feature that gets underrated in reviews.
This is the right pick if your jobs are vehicles, patio furniture, and light deck cleaning and you do not want to accidentally etch paint or soft wood with excess pressure. Skip it if you need to strip concrete sealant or blast caked driveway oil.
Ryobi RY141900 2000-PSI Electric Pressure Washer
Best for homeowners who want onboard hose storage and a clean setup
Ryobi RY141900 2000-PSI Electric Pressure Washer
Best for homeowners who want onboard hose storage and a clean setup
What we like
- Built-in hose reel keeps the 25-foot hose coiled on the unit so you are not chasing it across the driveway.
- Roll cage frame protects the motor and pump from tip-over damage — noticeably more rugged than same-price competitors.
- Removable detergent tank pulls off for easy refilling and can be rinsed separately without flushing the whole machine.
- Includes a turbo nozzle that delivers up to 50% more impact force for stubborn surface stains without needing full PSI.
What we don't
- At 1.2 GPM the rinse time on large driveways adds up quickly compared to higher-flow models.
- 2,000 max PSI is adequate for most home jobs but will not handle embedded concrete oil stains without multiple passes.
- The turbo nozzle creates vibration in the wand that is tiring on longer cleaning sessions.
The RY141900 stands out at this price point because of the built-in hose reel — it sounds like a minor feature until you have dragged a tangled 25-foot hose across a wet driveway and caught it under a tire for the third time. The roll cage frame is also meaningfully more durable than the thin plastic shells on cheaper electric units, and the detergent tank is fully removable for cleaning without any tools.
Buy this if you want an organized, durable everyday electric washer that stores cleanly and handles standard home cleaning. Skip it if your jobs are heavy concrete or you need GPM over 1.2.
Simpson Clean Machine CM61456 3200-PSI Gas Pressure Washer
Best for large driveways and heavy outdoor cleaning jobs without an outlet
Simpson Clean Machine CM61456 3200-PSI Gas Pressure Washer
Best for large driveways and heavy outdoor cleaning jobs without an outlet
What we like
- 3,200 PSI at 2.5 GPM delivers 8,000 cleaning units — more than twice the cleaning power of the electric options on this list.
- Onboard soap tank and included turbo nozzle let you apply detergent and blast concrete stains without any accessories to buy.
- 12-inch never-flat wheels roll across gravel, grass, and wet concrete without getting stuck or sinking.
- Powder-coated steel frame resists corrosion and handles rough outdoor storage without the cracking plastic shells on electric units.
What we don't
- Gas engine adds noise, exhaust fumes, and fuel costs — unusable indoors or in enclosed spaces.
- Significantly heavier than any electric option on this list and requires more effort to transport and store.
- Gas engines require winterization and periodic maintenance that electric models do not need.
If the electric options above are not finishing the job fast enough, this is the unit. At 3,200 PSI and 2.5 GPM, the CM61456 cleans more than twice as fast as any electric washer on this list — it is the difference between one pass on a concrete driveway and three.
The onboard soap tank and turbo nozzle are included, so you are set up to apply detergent and blast immediately out of the box. This is for people with large driveways, long fence runs, or multiple outbuildings to clean in one session.
It is not for someone who washes one car occasionally — the gas engine, weight, and maintenance overhead are overkill for that use case.
What to Look For
Tank volume matters more than it looks on spec sheets. A 0.5-gallon tank is enough for a single car wash or small deck; anything bigger means multiple refills mid-job and that defeats the point.
Electric vs gas comes down to where you need to use it. Electric models are quieter, need no fuel, and handle most residential jobs fine — gas units are worth the extra weight only if you are cleaning large driveways, siding, or doing back-to-back jobs without access to an outlet.
Check whether the soap nozzle is included in the box. Some models list an onboard detergent tank but ship the soap nozzle separately as an accessory — confirm the package includes it before buying.
Who Should Skip This
Skip onboard-tank models if you are doing large commercial runs where you need bulk chemical injection at high concentration — a downstream or upstream chemical injector with a separate tank gives you more control. Also skip electric models entirely if your nearest outlet is more than 35 feet from your work area and you do not own an extension-rated cord.
What the Community Actually Uses
On r/pressurewashing, the recurring advice is to ignore PSI marketing numbers and focus on GPM alongside tank volume — members point out that 2,000 PSI at 1.2 GPM cleans far slower than 2,000 PSI at 2.0 GPM, and that a small soap tank on an otherwise good machine is the most common complaint in long-term ownership threads.
Quick Picks — In Case You've Already Decided
Frequently Asked Questions
Can I use any soap in a pressure washer detergent tank?
No — standard dish soap or household cleaners can damage the pump seals and void the warranty. Use detergents specifically labeled as pressure washer safe or concentrate formulas from the washer's brand.
Does a built-in detergent tank work at high pressure?
Onboard tanks inject soap through the low-pressure soap nozzle only — they do not add detergent at full PSI. You switch to the soap tip, apply detergent at low pressure, let it dwell, then swap back to a high-pressure nozzle to rinse.
How do I clean the detergent tank after use?
Fill the tank with clean water and run it through the machine until the output is clear. Skipping this step causes soap to dry and clog the injection port, which is one of the most common pressure washer maintenance issues.
Is a gas pressure washer better than electric for cleaning with detergent?
Not necessarily for detergent performance — both apply soap the same way through a low-pressure nozzle. Gas wins on raw PSI and GPM for large concrete jobs; electric wins for convenience, noise, and close-quarters work.
What PSI do I need for a driveway vs a car?
Cars and soft surfaces: 1,200-1,900 PSI to avoid paint damage. Driveways and concrete: 2,500-3,200 PSI cuts through embedded grime and oil stains efficiently. Using too much PSI on a car can etch clear coat.
Buying Guide
You need enough PSI for the job and a detergent tank that actually holds usable volume. Match PSI to surface: cars and decks need 1,700-2,000, driveways and siding need 2,000-2,500, concrete and stubborn stains need 3,000+.
Always check that the soap nozzle is included.