10 Best Gas Powered Pressure Washers 2025 in the United States

The Simpson KB65132 King Brute is a heavy-duty hot-water gas pressure washer designed for industrial use. With a powerful 4000 PSI and 4.0 GPM output, it is ideal for tackling tough grease and oil stains on industrial equipment, factory floors, and fleet vehicles. The CRX 420 engine is reliable and features a low-oil shutdown to extend engine life. Its durable construction includes a 1-1/2” tubular welded steel frame and powder-coated finish, ensuring long-lasting durability.

Additionally, it comes with a 50-foot hot water hose, heat-resistant spray gun, and four nozzle tips (15°, 25°, 40°, and Soap), providing versatility for different cleaning tasks. The pneumatic tires make it maneuverable across various terrains, although its substantial weight of 396 pounds may require effort to move around. This pressure washer’s large fuel tank capacities (1.6 gal gasoline and 5.0 gal diesel) support extended use without frequent refueling.

However, its size and weight may not be suitable for casual users or those with limited storage space. This model is 49-state compliant, excluding California, and may be more suited for businesses or professionals rather than homeowners. Its specialized features and industrial capability mean it is best for those with heavy-duty cleaning needs.

The SIMPSON Cleaning ALH4240 is a high-performance gas-powered pressure washer, ideal for professional use. With a powerful 4200 PSI and 4.0 GPM, it is well-suited for heavy-duty tasks such as deck cleaning and wood restoration. The reliable HONDA GX390 engine ensures easy starts and dependable performance, while the maintenance-free CAT Industrial triplex plunger pump adds to its durability.

It is equipped with a 50-foot high-pressure hose that is kink- and abrasion-resistant, allowing for extended reach without compromising maneuverability. The five quick-connect nozzle tips provide versatility for different cleaning needs, and the professional spray gun with a safety lock-out enhances user safety and control. Despite its robust construction, the 124-pound weight and large 13-inch pneumatic tires make it relatively easy to move across various terrains.

However, its significant weight may still present challenges for some users when transporting the unit. Additionally, it is designed for 49-state compliance, excluding California. If you need a powerful, durable, and versatile pressure washer for professional applications, the SIMPSON ALH4240 is a strong contender, although it may be overkill for more casual, residential use.

The Westinghouse WPX3400 Gas Pressure Washer offers a strong performance with a maximum pressure of 3400 PSI and a flow rate of 2.6 GPM. This makes it suitable for a variety of deep-cleaning tasks, including decks, driveways, and cars. The powerful 212cc 4-stroke engine ensures reliable operation, while the heavy-duty steel frame and 12-inch never-flat wheels add to its durability and portability.

Users will appreciate the onboard 0.5-gallon soap tank for added convenience during cleaning tasks. The 25-foot abrasion-resistant hose provides ample reach, and the package includes a spray gun, wand, and five quick-connect nozzles for versatile usage. Additionally, it is compatible with various pressure washer accessories, enhancing its functionality.

Some users might find the 63-pound weight a bit cumbersome to move around frequently, despite the wheels. The product is backed by a 3-year limited warranty, offering peace of mind. The inclusion of engine oil, tools, and a quick start guide facilitates easy setup. While it delivers excellent cleaning power, the noise level typical of gas-powered models might be a consideration for some users. The Westinghouse WPX3400 is a solid choice for homeowners looking for a robust and versatile pressure washer for extensive outdoor cleaning projects.