When you need serious cleaning power, a gas pressure washer is the tool for the job. Unlike electric models, gas washers deliver higher PSI and GPM, making them perfect for large driveways, decks, farm equipment, job sites, and even commercial cleaning. If you’re tired of weak washers and want something built to last, a gas model is the right investment. In this guide, we’ll review the best gas pressure washers, explain what to look for, and help you find the perfect machine for your needs.
Quick Picks
- Best Overall: Simpson Cleaning ALH4240 Gas Pressure Washer – 4200 PSI, 4.0 GPM – Rugged aluminum frame, Honda engine, CAT pump.
- Best Budget: Westinghouse WPX3200 Gas Pressure Washer – 3200 PSI, 2.5 GPM – Affordable, compact, and dependable for home use.
- Best Premium: NorthStar Gas Pressure Washer – 4000 PSI, 3.5 GPM – Professional-grade Honda GX engine with CAT triplex pump.
Buyer’s Guide – What to Look for in a Gas Pressure Washer
Before buying, keep these key factors in mind:
- PSI (Pressure): Determines how strong the water blast is. Light jobs need ~2500 PSI, while heavy-duty jobs need 4000+ PSI.
- GPM (Flow): Higher GPM means more water volume, making cleaning faster.
- Engine: Honda GX engines are the gold standard. Kohler and Westinghouse are also reliable.
- Pump Type: Triplex pumps (CAT, AR, General Pump) last much longer than axial pumps.
- Frame & Portability: Wheeled frames are great for mobility; skid-mounted models suit contractors.
- Hot vs Cold Water: Hot water cuts grease, while cold water is fine for most outdoor jobs.
Detailed Reviews – Best Gas Pressure Washers
1. Simpson Cleaning ALH4240 Gas Pressure Washer – 4200 PSI, 4.0 GPM
Who it’s for: Professionals and homeowners who need a rugged, high-power washer for big jobs.
- Key Benefits:
- 4200 PSI, 4.0 GPM
- Honda GX390 engine
- CAT industrial triplex pump
- Aircraft-grade aluminum frame
Pros:
- Top-tier Honda engine
- Commercial-grade pump
- Lightweight but tough aluminum frame
Cons:
- Premium price
- Loud operation
Verdict: A professional-grade unit with unbeatable reliability. Check Price Here
2. Westinghouse WPX3200 Gas Pressure Washer – 3200 PSI, 2.5 GPM
Who it’s for: Homeowners wanting a budget-friendly gas washer for driveways, siding, and decks.
- Key Benefits:
- 3200 PSI, 2.5 GPM
- Horizontal shaft OHV engine
- Axial cam pump
- Detergent soap tank included
Pros:
- Affordable entry-level gas model
- Easy to set up and use
- Compact storage design
Cons:
- Axial pump isn’t as durable as triplex
- Lower flow rate than premium models
Verdict: The best budget gas washer for homeowners. Check Price Here
3. NorthStar Gas Cold Water Pressure Washer – 4000 PSI, 3.5 GPM
Who it’s for: Contractors and pros who want reliability and power.
- Key Benefits:
- 4000 PSI, 3.5 GPM
- Honda GX390 engine
- CAT industrial triplex pump
- Heavy-duty steel frame
Pros:
- Pro-grade Honda engine
- CAT pump keeps consistent pressure
- Rugged build quality
Cons:
- Heavy unit (over 150 lbs)
Verdict: A professional favorite with long-lasting components. Check Price Here
4. Generac 6565 Gas Pressure Washer – 4200 PSI, 4.0 GPM
Who it’s for: Contractors who want a commercial-grade unit at a competitive price.
- Key Benefits:
- 4200 PSI, 4.0 GPM
- 420cc Generac OHV engine
- Triplex pump with ceramic-coated pistons
- Heavy-duty pneumatic tires
Pros:
- Excellent cleaning performance
- Competitive pricing for its power
- Durable pump system
Cons:
- Heavier than Honda-powered models
Verdict: A great alternative to Honda-powered machines. Check Price Here
5. Champion 4200-PSI Gas Pressure Washer
Who it’s for: Contractors and homeowners who want pro-level power at a mid-range price.
- Key Benefits:
- 4200 PSI, 4.0 GPM
- 389cc Champion engine
- Triplex pump
- 50-foot steel-braided hose
Pros:
- Good balance of price and power
- Durable components
- Long hose for better reach
Cons:
- Not as refined as Honda-powered units
Verdict: A reliable, cost-effective pro washer. Check Price Here
6. Simpson PowerShot PS60843 Gas Pressure Washer – 4400 PSI, 4.0 GPM
Who it’s for: Heavy-duty users needing max performance for commercial cleaning.
- Key Benefits:
- 4400 PSI, 4.0 GPM
- Honda GX390 engine
- AAA industrial triplex pump
- Welded steel frame
Pros:
- Maximum cleaning power
- Trusted Honda engine
- Professional-grade durability
Cons:
- Loud and heavy
Verdict: One of the most powerful consumer-available gas washers. Check Price Here
Comparison Table
| Model | PSI / GPM | Engine | Pump | Best For | Price |
|---|---|---|---|---|---|
| Simpson ALH4240 | 4200 / 4.0 | Honda GX390 | CAT Triplex | Pro & Residential | Check Price |
| Westinghouse WPX3200 | 3200 / 2.5 | OHV Engine | Axial | Budget Home Use | Check Price |
| NorthStar 4000 | 4000 / 3.5 | Honda GX390 | CAT Triplex | Professional | Check Price |
| Generac 6565 | 4200 / 4.0 | 420cc Generac | Triplex | Contractors | Check Price |
| Champion 4200 | 4200 / 4.0 | Champion 389cc | Triplex | Pro Users | Check Price |
| Simpson PowerShot PS60843 | 4400 / 4.0 | Honda GX390 | AAA Triplex | Heavy-Duty | Check Price |
FAQ – Gas Pressure Washers
1. Are gas pressure washers better than electric?
Yes, gas washers deliver more power, durability, and mobility. Electric models are lighter and quieter, but weaker.
2. What PSI should I get?
For cars and patios, 2500–3000 PSI is enough. For driveways and pro jobs, 4000+ PSI is best.
3. How long do gas washers last?
With proper maintenance, a quality gas pressure washer can last 8–10 years or more.
4. Do gas washers need special fuel?
Most use regular unleaded gasoline. Hot water models may use diesel or kerosene for burners.
5. Can I use a gas washer indoors?
No. Gas engines produce carbon monoxide. Always use outdoors or in well-ventilated spaces.
Conclusion
A gas pressure washer is the ultimate tool for serious cleaning jobs. For most buyers, the Simpson ALH4240 offers the best balance of power, durability, and value. On a tighter budget? The Westinghouse WPX3200 gets the job done without breaking the bank. Need pro-level power for heavy-duty work? The NorthStar or Simpson PowerShot PS60843 deliver maximum reliability and performance.
Ready to step up your cleaning power? Choose one of the gas pressure washers above and tackle any job with confidence.