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The 5 Best Gas Pressure Washers (2023 Review)

Gas pressure washers deep clean your deck, patio, and other outdoor spaces. In this review, the This Old House Reviews Team researched the best gas pressure washers on Amazon to help you find the product that’s right for you and your home.

Westinghouse Pressure Washer and Generac Gas-Powered Pressure Washer against a blue graph paper background Courtesy Amazon

Pressure washers use water to remove grime from your patio or patio furniture, driveway, fence, and other surfaces. If you want a clean outdoor space without paying professional service fees, read our review on the best gas pressure washers available on Amazon.

Compare Top Gas Pressure Washers

Product Hose Length Pressure Output Flow Rate Weight Dimensions
Product Hose Length Pressure Output Flow Rate Weight Dimensions
Westinghouse Gas Pressure Washer 25 feet 3,400 PSI 2.6 GPM 63 pounds 21 x 19.5 x 39 inches
Champion Commercial-Duty Gas Pressure Washer 50 feet 4,200 PSI 4.0 GPM 125 pounds 49.5 x 23.9 x 28.1 inches
Simpson Cleaning MegaShot Gas Pressure Washer 25 feet 3,200 PSI 2.5 GPM 66 pounds 21 x 24 x 34 inches
Simpson Cleaning PowerShot Gas Pressure Washer 25 feet 3,300 PSI 2.5 GPM 77 pounds 21 x 24 x 34 inches
Generac Gas-Powered Pressure Washer 30 feet 3,100 PSI 2.4 GPM 65 pounds 24.2 x 18.9 x 35.5 inches

Top 5 Gas Pressure Washers

Most Lightweight: Westinghouse Gas Pressure Washer

Blue Westinghouse gas-powered pressure washer

Westinghouse Gas Pressure Washer

  • $349

Prices taken at time of publishing.

This pressure washer has a 1-gallon water tank and a half-gallon detergent tank for extended use. Despite its lightweight 63-pound frame, it can deliver a powerful 3,400 pounds per square inch (PSI) of pressure at 2.6 gallons per minute (GPM).

Courtesy Amazon

Pros and Cons

✔ Comes in other styles with less pressure
✔ Has a 3-year warranty on service, labor, and parts
✔ Comes with never-flat wheels

✘ Criticized for having flimsy parts
✘ May arrive with a fuel smell or residual oil on its body from factory testing

What Customers Are Saying

Happy Amazon customers said that this power washer was easy to assemble. In addition, other reviewers praised the manufacturer for making the connectors out of metal instead of plastic. However, negative reviews said that the motor failed after only a few uses. Some also said that the other parts of the machine felt flimsy.

Best Heavy-Duty Washer: Champion Commercial-Duty Gas Pressure Washer

Pros and Cons

✔ Has a commercial-grade, corrosion-resistant brass head pump
✔ Comes with a hose storage strap
✔ Comes with free lifetime technical support

✘ Heavy at over 120 pounds
✘ Comes with a short two-year warranty

What Customers Are Saying

Many customers noted that the hydraulic hose that this gas pressure washer came with was an impressive addition. The washer was continually said to be an excellent value for the money, easy to assemble, and easy to use. Negative reviews criticized this gas pressure washer for having cheap tires and vibrating excessively.

Best Medium-Duty Washer: Simpson Cleaning MegaShot Gas Pressure Washer

Pros and Cons

✔ Has two 10-inch pneumatic wheels for mobility
✔ Tested in a factory to ensure high performance
✔ Includes oil and a siphon tube for its Honda engine

✘ Doesn’t ship to California
✘ Not as powerful as the other Simpson Cleaning pressure washer in this review

What Customers Are Saying

Many Amazon customers said that this power washer model was easy to assemble, use, and maneuver. Others noted that it was powerful enough to deep clean their deck and outdoor furniture quickly. Some customers criticized this power washer for having a poorly constructed pump that broke easily. They also noted poor customer service experiences.

Best Warranty: Simpson Cleaning PowerShot Gas Pressure Washer

Pros and Cons

✔ Includes five quick-connect nozzle tips
✔ Powerful enough to remove graffiti and mildew
✔ Comes with additional warranties for the engine, accessories, and pump

✘ Noted by some customers that it was hard to assemble
✘ Criticized for leaking oil

What Customers Are Saying

Pleased customers experienced good customer service from the manufacturer. Others pointed out that this gas pressure washer was easy to use and move. Unhappy customers said that this washer leaked oil and was hard to assemble.

Best For Light Jobs: Generac Gas-Powered Pressure Washer

Orange Generac gas pressure washer

Generac Gas-Powered Pressure Washer

  • $459

Prices taken at time of publishing.

This washer’s axial cam pump has easy-access hose connections, so users don’t have to kneel on the ground to secure their selection of hoses. The machine is intended to handle light-to-medium jobs, such as washing your car, using its 3,100 PSI of pressure.

Courtesy Amazon

Pros and Cons

✔ Includes an on-board half-gallon detergent tank
✔ Has oversized never-flat tires to move the washer over any terrain
✔ The ergonomic spray gun has an integrated PowerDial to quickly adjust pressure settings

✘ Has the lowest pressure output in this review at 3,100 PSI
✘ Has the lowest flow rate in this review at 2.4 GPM

What Customers Are Saying

Lots of reviews noted that assembly was straightforward, and operation was intuitive. Many customers pointed out that this washer was a solid choice for the money. Unhappy customers criticized this model for having a poor design and arriving with missing parts.

Buyer’s Guide

The right tools make heavy-duty cleaning jobs easy and effortless. To find the best pressure washer for your needs, read our buying guide to learn about important factors, such as pressure and portability.


Most gas pressure washers have four-stroke engines, but some have two-stroke engines. Four-stroke engines last longer, are quieter, and release fewer emissions than their two-stroke counterparts. Two-stroke engines are commonly found in smaller tools, such as gas chainsaws, and run faster than four-stroke ones.

Another important indicator of an engine’s quality is its horsepower (hp), which tells you how powerful the engine is. A higher hp rating indicates more power.

Hose Connections

Your gas pressure washer should come with multiple connection ports for different hoses or attachments. These connections should be easy to access and accommodate other hoses that didn’t originally come with the product, allowing for customized cleaning jobs.


Gas pressure washers can be heavy, with the smallest models weighing around 60 pounds. If you want to perform several tasks around your yard, look for a model with wheels and a handle to help you move it from one location to another.


The pressure of the water that the machine releases is measured in pounds per square inch (psi). A higher psi gives you more power to cut through dirt and grime. Most machines have adjustable pressure settings, allowing you to change the water pressure to match a variety of jobs.

Spray Wand

Pressure washers have spray guns with hoses that usually extend between 25 and 35 feet. These spray guns will also come with several spray nozzles.


Gallons per minute (GPM) describes how much water a machine supplies. Look for a machine with both high pressure and volume for it to clean large areas with tough grime.

Frequently Asked Questions

What is a good PSI for a gas pressure washer?

A good PSI for a medium-duty gas pressure washer ranges between 2,000 to 3,200 PSI. This PSI range is generally fit to handle basic household tasks, such as pressure washing a driveway or deck. For commercial-level power, look for a gas pressure washer with 3,200-5,000 PSI.

Do all pressure washers use gas?

No. Some pressure washers use electricity. Electric pressure washers are more portable, but they don’t have as much power as gas models. However, both types of power washers make suitable surface cleaners.

Why does my gas pressure washer need oil?

Oil keeps the engine lubricated, preventing it from wearing out. Two-stroke models mix the oil with the gas, but four-stroke models have a compartment just for gas.

What types of jobs can I use my gas pressure washer for?

Gas pressure washers have so much power that they’re really only safe for use on hard surfaces, such as concrete driveways and brick walls. If you use them on delicate surfaces, such as cars, you could cause irreversible damage.

Why Trust The This Old House Reviews Team

This Old House has empowered homeowners for more than four decades with top-notch home improvement content in the form of television programs, print media, and digital content on its website and social media platforms. The This Old House Reviews Team focuses on creating in-depth product and service review content to help inform your purchasing decision for just about any item or resource that you might need for your home. The This Old House Reviews Team has written over 1,000 reviews on products in the home space, from cordless drills to kitchen trash cans, lawn mowers, and dining room decorations.

We recommend products in each review using an intensive research process, spending hours combing through the best available models on Amazon. For a product to make our list of top picks, it must hold a solid sales record on Amazon, have consistently positive customer reviews, and offer unique features, among other factors. After narrowing down our list of recommendations, we conduct additional research and sometimes in-person testing to ensure that the products meet our standards. Once we conclude the research phase, we craft a well-rounded, user-friendly article that includes our recommended products and additional information to help homeowners like you make the right purchase.

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