4 gallons per minute pressure washer

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Choosing the Best 4 Gallons Per Minute Pressure Washer

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Tired of spending endless hours scrubbing your driveway, deck, or patio to eliminate dirt and grime?

A 4 gallons per minute (GPM) pressure washer, like the popular SIMPSON Cleaning PS4240 PowerShot, Westinghouse WPX4400, Commowner 3800 PSI, or Champion Power Equipment 4200 can save the day with their powerful cleaning capabilities.

In this guide, we’ll explore the best 4 GPM pressure washers available, discussing their features, capabilities, and advantages to help you make an informed purchase decision. Transform your cleaning experience with these exceptional high-powered cleaning machines today!

Why Choose a 4 Gallons Per Minute Pressure Washer?

The main advantage of a 4 gallons per minute pressure washer is its ability to clean large surfaces quickly and efficiently. Unlike lower-powered alternatives, a 4 GPM pressure washer delivers a more potent water flow, cutting down on the time and effort spent on cleaning tasks. Let’s dig into some of the key benefits:

Enhanced Cleaning Power

A higher water flow rate means better cleaning performance. With a 4 GPM pressure washer, you’ll be able to blast away dirt, stains, and grime with ease. This increased power helps you tackle even the most stubborn outdoor cleaning jobs, from removing algae on the fence to stripping paint off outdoor furniture.

Faster Cleaning Time

Since a 4 GPM pressure washer can move more water per minute, you’ll be able to cover larger areas in less time, ultimately making your cleaning tasks much quicker. You’ll spend less time hosing down your surfaces, leaving you with more free time to relax or tackle other projects.

time vs gpm chart for pressure washers


A 4 GPM pressure washer is versatile enough to handle a wide range of cleaning tasks. With the right attachments, you can easily switch between different cleaning applications, such as washing your car, cleaning your gutters, or even removing graffiti off of walls.

Durability & Longevity

Most 4 GPM pressure washers are designed with durability in mind, meaning that they often feature higher-quality components and materials to ensure they last longer. By investing in a 4 GPM model, you’ll benefit from an extended lifespan and reduced maintenance costs.

Top 4 Gallons Per Minute Pressure Washer Reviews

After extensive research, we’ve narrowed it down to three of the best 4 GPM pressure washers available on the market. Each one has its own distinct features, advantages, and disadvantages. Let’s take a closer look:

1. SIMPSON Cleaning PS4240 PowerShot

The SIMPSON Cleaning PS4240 PowerShot is a professional-grade pressure washer designed with corrosion resistance in mind.
Key Features:

  • Powered by a Honda GX390 engine
  • Delivers 4200 PSI of pressure at 4.0 GPM
  • Ideal for quick and effective cleaning of decks, siding, patios, and more


  • High pressure and water flow for efficient cleaning
  • Durable construction with its corrosion resistance


  • May be more expensive than other models
  • Could be overpowered for lighter tasks

2. Westinghouse WPX4400 Gas Pressure Washer

The Westinghouse WPX4400 Gas Pressure Washer is a highly-rated and potent equipment designed for a variety of cleaning tasks.

Key Features:

  • Delivers 4400 PSI and 4.2 GPM of cleaning power
  • It comes with a spray gun, wand, and 5 nozzle set.
  • CARB compliant making it eco-friendly and efficient


  • Versatile and suitable for a wide range of tasks, from cleaning cars to patios and fences
  • Provides higher power and water flow for enhanced cleaning


  • Might be too expensive for those on a tight budget
  • The power might be an overkill for small, light cleaning tasks

Read more about the Westinghouse brand and their pressure washers here.

3. Commowner 3800 PSI Electric Pressure Washer

The Commowner 3800 PSI Electric Pressure Washer is an upgraded version with improved water pressure and flow rate.

Key Features:

  • Provides a maximum pressure of 3800 PSI at a flow rate of 4.0 GPM
  • Comes with 4 interchangeable nozzles and a soap bottle
  • It is portable, with 8m long pressure hose and 10m power cord


  • High-pressure washing for efficient cleaning
  • Versatile use with multiple nozzles and a soap applicator
  • Lightweight and portable design for easy maneuvering


  • Electric-powered model might not provide the same power as gas models
  • Higher PSI could be unsafe with improper use

4. Champion Power Equipment 4200-PSI 4.0-GPM Gas Pressure Washer

The Champion Power Equipment 4200-PSI 4.0-GPM Gas Pressure Washer is a robust, multi-purpose pressure washer with substantial cleaning power.

Key Features:

  • Delivers water at a pressure of 4200 PSI and 4.0 GPM
  • It’s gas-powered, promising robust and consistent power
  • Built for commercial duty, it is ideal for both heavy-duty and simple cleaning tasks


  • Powerful machine with high PSI and water flow for efficient cleaning
  • Well-suited for heavy-duty use but also adaptable for lighter tasks
  • Has a reputation of durability and reliability


  • More expensive than many other models on the market
  • Heavy-duty design might be more than necessary for small, household cleaning tasks
  • As it’s gas-powered, it might be louder than its electric counterparts

Overall Best 4 GPM Pressure Washer: Westinghouse WPX4400

The Westinghouse WPX4400 Gas Pressure Washer, delivering 4400 PSI and 4.2 GPM, stands out as our top recommendation for the best 4 GPM pressure washer. This machine offers powerful and deep cleaning water pressure, making it perfect for a myriad of outdoor cleaning tasks.

Key Features:

  • High water pressure: With 4400 PSI and flow rate of 4.2 GPM, this pressure washer is a powerhouse, easily tackling heavy cleaning.
  • Quick Connect Nozzles: 5 quick connect nozzles (0°, 15°, 25°, 40°, and soap) allows a wide range of cleaning applications.
  • Gas-powered for uncompromised power: This model is powered by a 420cc 4-Stroke Westinghouse OHV Horizontal Shaft Engine.
  • Abrasion Resistant Super-Flex Hose: 25 foot Super-Flex hose for far-reaching cleaning jobs.
  • Heavy duty construction: It features a tough steel frame construction and flat free wheels for easy transportation.


  • Heavy-duty use: Its robust design makes it well-suited for heavy-duty cleaning tasks at home or in commercial setups.
  • Versatile cleaning options: With its quick connect nozzles, you can optimize the cleaning process for specific tasks.
  • Reliable customer service: Westinghouse provides excellent customer service, offering a 3-year limited manufacturer service for both labor and parts.


  • Expensive: It is on the higher end of the price spectrum, which might be a consideration for some.
  • Gas-powered: While this offers consistent power, it is louder and less environment-friendly than electric models.

Factors to Consider When Buying a 4 Gallons Per Minute Pressure Washer

When buying a 4 GPM pressure washer, there are some essential factors that you must consider to ensure you get the best value for your money. This guide aims to help you identify what to look for to make an informed purchasing decision.

1. Power Source

Pressure washers can be powered by electricity or gas. Each type of power source has its advantages and disadvantages which you should carefully consider. Electric pressure washers are quieter, require less maintenance, and are better for the environment. On the other hand, gas pressure washers are usually more powerful and do not restrict you with the length of the power cord.

2. PSI (Pounds per Square Inch)

PSI indicates the strength of the water pressure. A machine with a higher PSI will remove dirt more effectively than one with a lower PSI. Consider the most common tasks you’ll be using your pressure washer for — if you’re looking to tackle tough stains and grime, you might need a unit with a higher PSI.

3. GPM (Gallons per Minute)

This is the measurement of water flow from the pressure washer. A higher GPM means you can clean a larger area in less time. Make sure the washer you select will provide a sufficient flow rate of at least 4 GPM to handle most residential cleaning tasks efficiently.

4. Nozzle Options

Look for a pressure washer that offers multiple nozzle options. Different tasks require different water pressure and spray angles, so having a variety of nozzles allows you to adjust the washer to handle everything from delicate garden furniture to concrete driveways.

5. Durability and Construction

Look for a pressure washer with a reputable brand and robust construction. Stainless steel frames, high-quality hoses and sturdy wheels can make the machine last longer. Also, consider the quality of customer service and the availability of spare parts.

6. Price

Pressure washers range in price, based on their make, model, and features. Decide how much you are willing to spend and find a washer that fits your budget without compromising on essential features.

Westinghouse WPX4400

In Conclusion

Selecting the right 4 GPM pressure washer can transform your cleaning process into something efficient, quick, and less strenuous. Remember, the best pressure washer isn’t necessarily the one with the highest price tag, but the one that optimally balances power, durability, and your specific cleaning needs.

By carefully considering the power source, PSI and GPM ratings, nozzle variety, construction, and price, you can make an informed choice that you won’t regret. Every cleaning task, whether it’s scrubbing your patio or refreshing your siding, can become a breeze with the right pressure washer by your side.

In the end, the joy of having a tool that makes your life easier and your living space cleaner is immeasurable.

Frequently Asked Questions (FAQs)

Q1: How does the engine capacity of a gas-powered pressure washer affect its performance?

A: The engine capacity, typically measured in cubic centimeters (cc), directly impacts the power output of a gas-powered pressure washer. Larger engines are capable of creating higher water pressure (PSI) and flow rate (GPM), allowing them to handle tougher cleaning tasks more effectively.

Q2: Is it possible to adjust the PSI and GPM of a pressure washer?

A: Some pressure washers come with adjustable PSI and GPM settings, allowing you to customize the output based on your cleaning needs. However, keep in mind that adjusting these settings beyond the manufacturer’s recommended limits can potentially damage the unit and void the warranty.

Q3: What role does a detergent injection system play in a 4 GPM pressure washer?

A: A detergent injection system allows for the use of cleaning solutions along with water, which can significantly enhance the cleaning process, especially for stubborn dirt or stains. Make sure your pressure washer either has an onboard detergent tank or a siphon tube for introducing the cleaning agents into the water spray.

Q4: Can I use hot water in my 4 GPM pressure washer?

A: Not all pressure washers are designed to handle hot water. Using hot water in a unit that’s not designed for it could lead to damage. If you need to use hot water for your cleaning tasks, consider investing in a pressure washer rated for hot water use.

Q5: How critical is the hose quality in a 4 GPM pressure washer?

A: The hose quality plays a critical role, as it must withstand high pressure of water constantly. Look for pressure washers that come with kink-resistant and abrasion-resistant hoses. These tend to be more durable and easier to use.

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