10 Best Gas Power Washers 2025 in the United States

The Simpson KB65132 King Brute is a high-powered gas pressure washer designed for industrial use. With a robust 4000 PSI and 4.0 GPM flow rate, powered by a reliable CRX 420 engine, it is capable of tackling heavy-duty cleaning tasks such as removing grease and oil stains from machinery and vehicles. The durable AAA triplex plunger pump ensures long-term performance, aided by features like low-oil shutdown for engine protection.

It includes premium accessories like a heat-resistant spray gun, insulated wand, and four quick-connect nozzle tips, enhancing its versatility and user comfort. The 50-foot hose provides extensive reach, and its sturdy steel frame with powder-coated finish ensures durability against rough handling and harsh environments. The unit is equipped with four large pneumatic tires for ease of movement across various terrains, although its substantial weight of 396 pounds may pose portability challenges for some users.

Additionally, the dual fuel tank system, with separate capacities for gasoline and diesel, supports prolonged operation without frequent refueling. Its design and specifications suggest it is most suitable for professionals and industries requiring powerful and efficient pressure washing capabilities. Its high weight and larger dimensions may be less convenient for everyday residential use. This machine is intended for rigorous industrial applications, offering reliability and high performance but requiring considerations for its heavy and substantial build.

The Simpson PS4240 PowerShot is a strong contender in the gas-powered pressure washer category, especially for professional use. It delivers 4200 PSI and 4.0 GPM, which provides a powerful and efficient cleaning experience suitable for demanding tasks like deck cleaning, wood restoration, and paint preparation. The Honda GX390 engine is known for reliability and ease of starting, making it a solid choice for contractors. The unit includes a heavy-duty AAA industrial triplex plunger pump with thermal relief to avoid overheating, which adds to its durability during extended jobs.

This washer comes with five quick-connect nozzles (0°, 15°, 25°, 40°, and soap), allowing flexibility for different cleaning needs. The 50-foot hose is both kink- and abrasion-resistant, enhancing usability without frequent interruptions. Portability is decent given its 141-pound weight, thanks to a sturdy welded steel frame and 13-inch pneumatic tires that help navigate various terrains. However, due to its weight, it’s less convenient for casual or light-duty users who might prefer something lighter.

The detergent system is integrated with a dedicated nozzle for soap application, which is practical for removing tough grime. One minor practical note is the fuel tank design, requiring careful filling to avoid spillage. The Simpson PS4240 is well suited for professionals or serious DIYers who need high power and reliability, but its heavier build and fuel handling might be less ideal for occasional users.

The PowerSmart Gas Pressure Washer offers strong cleaning performance with 3400 PSI pressure and 2.5 GPM water flow, making it capable of handling tough cleaning jobs on driveways, patios, cars, and fences. Its 212cc 4-stroke OHV engine allows for a quick, easy pull start and requires less maintenance since it doesn’t need mixing oil with gas. The inclusion of 5 different nozzles (0°, 15°, 25°, 40°, and soap) provides flexibility to switch between intense spot cleaning and more gentle washing, which is handy for various surfaces.

Portability is a plus with its lightweight frame (31 pounds) and large 10-inch wheels, making it easy to move around your yard or job site. The foldable handle also helps save storage space. The hose length is somewhat short at 26 inches, which might limit reach without an extension.

With a wand length of 27 inches, you get decent reach for cleaning, although heavier or larger tasks might require some effort to manage. This pressure washer is a solid choice if you need a mid-range gas-powered unit that balances power, portability, and ease of use without complex setup.