Best Gas Pressure Washers
Gas pressure washers are strong, sturdy, and durable. They usually deliver at least 2,800 PSI and are powerful enough for all household and commercial cleaning jobs.
Although they are heavier than electric pressure washers, gas models give you a different dimension of maneuverability. Since you don’t need to plug them in, you can move the machine wherever you need to use it with ease.
As with any product, you will have to consider multiple things before choosing the best gas pressure washer for you. This guide goes over the best models and everything else you need to know to find your fit.
In this guide:
Best Gas Pressure Washers
To find the best gas pressure washers, we accumulated performance and quality data on the most popular models on the market. The data collected includes pricing, power, customer reviews, features, and more.
A large portion of the rating criteria is based on customer review scores and the power offered by the pressure washer in relation to the price. The higher its power and the lower its price, the better its value to the customer and the better the overall rating.
Once this gave us a quantitative differentiator, we moved onto the qualitative aspects that differentiated the pressure washers. These include extra features such as which nozzles are included, detergent tanks and detergent dilution, the warranty length, on-board storage, and more.
Our analysis resulted in the best gas pressure washers currently available in the market, which we have listed below. Note that each of these power washers is a great option and the best for you will depend on your needs.
Best Overall Gas Pressure Washer: Generac 6882
Efficient and powerful, the Generac 6822 is a very capable gas-powered pressure washer. It provides you with a total cleaning unit count of 6,960, sufficient for all domestic and commercial purposes. While the machine is undoubtedly powerful, what makes it unique is the user-friendly design and low cost.
One of the biggest pain points we see with pressure washers is the time and effort it takes to clean. Generac has tackled this issue with thoughtful attachments. The Turbo nozzle cleans up to 30% faster and Generac’s Soap Blaster nozzle reaches up to 3 times farther than regular soap nozzles—making it easier and faster for you to accomplish your cleaning jobs.
To add to these valuable features, the Generac 6822 also comes with a PowerDial ergonomic spray gun. This gun comes with a dial that is capable of adjusting the water flow of the machine based on the surface you are cleaning. These surfaces include wood, concrete, car, and soap. So all you need to do is twist and select the surface you need to clean and the machine will adjust.
Like all gas pressure washers, the 6822 is louder than its electric-powered counterparts. There is also going to be more maintenance required and regular operational costs involved.
Overall, if you are looking for a powerful machine for an affordable price with a good warranty period and helpful attachments, the Generac 6822 is an amazing option.
Most Powerful Gas Pressure Washer: Generac 7122 SpeedWash
The Generac 7122 SpeedWash is a powerhouse. Delivering a total cleaning unit count of 8,640, this machine will accomplish all your household and commercial cleaning tasks.
Perhaps the most striking thing about Generac’s designs is the attention paid to making the machine an efficient model. The 7122 SpeedWash comes with a Turbo nozzle cleaning up to 30% faster, a Soap Blaster nozzle that applies soap up to 3 times farther, and a PowerBroom attachment with a coverage area of 12 inches.
Adding to its versatility are the four other color-coded nozzle attachments (0°, 25°, 40°, and soap), that vary the water flow and fan as required. The ergonomically designed PowerDial spray gun has four different surface settings that allow you to quickly adjust to the optimal settings for cleaning wood, concrete, your car, or for soaping things.
It is also protected by a 3-year engine and 2-year parts warranty, both of which are better than most other gas power washers.
Since the machine is gas-powered, it is noisier than electric pressure washers and is vulnerable to malfunctioning after long periods of storage. It also requires frequent maintenance and operational expenses like lubricant and fuel.
All in all, if you are looking for a powerful pressure washer, and time and effort are primary concerns for you, the few extra bucks spent on the Generac 7122 SpeedWash will be worth it. It delivers great value for money and is a powerhouse.
Best Customer Reviews: Simpson MSH3125 MegaShot
The Simpson MSH3125 MegaShot is a very powerful and reasonably priced machine. It delivers one of the highest cleaning unit counts of 8,000, making it suitable for household and commercial applications.
While its power is an important feature, it is also user friendly and durable. The intelligent design starts with the easy assembly process and goes all the way to the maneuverability thanks to the 10-in pneumatic tires. The machine comes with 5 nozzle fittings (0°,15°, 25°, 40°, and soap) to make it easy to find the perfect water flow and pressure.
Another notable feature is the detergent siphon hose that extracts soap directly from a detergent bottle and can automatically dilute it too. All of these design features and the solid frame of the machine have resulted in positive reviews from customers.
On the downside, although the machine has a decent 2-year engine warranty and a 1-year pump warranty, the accessories are protected only by a 90-day warranty. This is shorter than most similar models.
All in all, the Simpson MSH3125 MegaShot is powerful and has great customer reviews. It has a user-friendly design and offers good power and features for the price. If you are looking for a reasonable gas-powered machine and power is a major factor, you should consider this product because its durability and performance are customer-vouched.
Best High-End Gas Pressure Washer: Simpson PS3228 PowerShot
The Simpson PS3228 PowerShot is a very powerful machine that delivers an eye-popping 8,250 cleaning unit count. This gas-powered pressure washer is versatile and can be used for both household and commercial cleaning purposes.
The frame of the PowerShot is made of steel and is sturdy. At its core, Simpson has gone with its AAA Triplex pump technology that enhances the pump’s performance and life. The high-pressure hose is also built using MorFlex technology, making the hose strong and flexible.
Another thing that sets the PowerShot apart are the warranty periods. If the engine, frame, or pump breakdown, they are protected by a 3-year, 10-year, and 5-year warranty, respectively. This is better than most other model’s warranties.
Like many of the other gas pressure washers on this list, the design of this product is very user friendly. All the nozzle tips (0°,15°, 25°, 40°, and soap), are color-coded for easy choosing and can be used by the user to adjust the water flow till it is perfect for the application. The PowerShot also comes with a detergent siphon tube that can be used to soap anything and the machine also provides automatic detergent dilution.
On the downside, the accessories are only protected by a 90-day warranty. Additionally, since the PowerShot is gas-powered, it is loud, prone to some maintenance problems and fumes, and requires the typical costs of lubrication and fuel.
Overall, the Simpson PS3228 PowerShot is an extremely powerful unit. If you are looking for a gas-powered “power washer”, and you do not mind paying a few extra bucks for a superior warranty and performance, you can take a shot with the PowerShot.
Another Great Gas Pressure Washer: Simpson MS60763-S MegaShot
The Simpson MS60763-S MegaShot is a gas-powered pressure washer that can be used for most domestic and commercial purposes. It is a sturdy machine with a steel frame, built on a powerful engine and a durable pump, and supported by 12” never-flat tires.
When it comes to performance, the powerful engine combines with 5 different nozzle fittings (0°,15°, 25°, 40°, and soap) to deliver a great cleaning experience. By simply changing these nozzles, you can switch from cleaning your furniture to sidewalk to soaping your car. The machine also comes with automatic detergent dilution capability, mixing water and detergent in a 7:1 ratio.
Where this machine might disappoint a user is its limited warranty period. This Simpson is supported by a 2-year engine warranty, 1-year pump warranty, and a 90-day accessories warranty. Along with the limited warranty for the accessories, the attachments have also been reported by users to be less sturdy than expected.
Powerful and relatively inexpensive, the Simpson MS60763-S MegaShot delivers great value. If you are looking for a machine that is reasonably priced and you do not mind a reduced warranty period, this is the pressure washer for you.
How We Rated the Best Gas Pressure Washers
As briefly mentioned in the above section, we went through an extensive research process to find the best gas pressure washers.
We started off with the 15 most popular units on the market today. From there, we gathered data including price, pressure, flow rate, warranty length, customer reviews, attachments, and more.
We put that data into our rating algorithm to narrow our list down to the 5 best gas pressure washers currently available. Our algorithm mostly benefits pressure washers with high power-to-price ratios and great customer reviews.
Over time, we will continually update this list to make sure that you can find the best gas pressure washers currently available.
Interested in all of our top choices? Check out our best pressure washers guide.
How to Decide Which Gas Pressure Washer to Buy
There are many options in the gas pressure washer market to consider.
So how do you decide which to buy?
Each has its own benefits to choose from. For example, some are extremely powerful while others are protected by an extended warranty period.
However, the distinguishing feature has to be the one that matters most to you. This section will list out all the important aspects that should be considered by you before making a purchase decision. By going through each, you will be able to make an informed decision on the best gas power washer for you.
Pressure Generated (PSI)
The pressure generated by pressure washers is measured in pounds per square inch or PSI. The higher this figure, the higher the pressure your unit delivers.
Gas-powered pressure washers deliver greater pressure than even the best electric pressure washers. The usual PSI count of gas-powered pressure washers starts from around 2,800 PSI and goes upwards to 3,300 PSI. This range is more than enough for all household cleaning jobs and most commercial applications.
Higher PSI counts will mean that your pressure washer is capable of cleaning a surface with less effort in a shorter period of time. This also means that you will be able to get better results against stubborn surfaces and spots if the PSI count is high.
Most pressure washers today—gas and electric—come with a number of nozzle attachments that alter the pressure and flow of water. These tips usually include all or some of the 0°,15°, 25°, 40°, and soap nozzles. The 0° nozzle is where you will get the maximum pressure and the narrowest water flow and the soap nozzle delivers a wider flow but generates the least pressure.
While using a pressure washer delivering high pressure is generally a better option, you will have to consider the fact that higher PSI means a higher price tag too. If you don’t have extremely grimy spots, like deeply stained concrete, that require high pressure, you might be better off spending less money on a lower PSI pressure washer.
Flow Rate (GPM)
The amount of water that the pressure washer can spray over a period of time is called the flow rate. The flow rate of a pressure washer is measured in gallons per minute or GPM. The higher this number, the more water is released from the machine onto the surface you are cleaning in a given amount of time.
What the flow rate will tell you about the pressure washer is the time and effort you will take to clean the surface. This is because more water hitting a surface is likely to dislodge the dirt/grime from it and make the cleaning job easier and quicker for you. The PSI and the GPM combine to give you the overall power of the machine.
The usual GPM range for gas-powered pressure washers lies in the range of 2.3 GPM to 2.8 GPM. This is significantly higher than electric pressure washers that range between 1.2 GPM to 1.8 GPM.
Similar to the PSI, the higher flow rate will attract a bigger price tag and you should consider your usage. If you deal with commercial tasks or have to clean stubborn dirt regularly, you will require a machine with a higher GPM.
Weight & Maneuverability
Gas-powered units have bigger bodies than electric units and therefore are significantly heavier. With starting weights of around 50 lbs, you can be certain that any gas-powered pressure washer you purchase will be relatively heavy. The manufacturers of gas-powered pressure washers usually provide a sturdy steel frame and this adds to the weight too.
However, these machines are set on large wheels, which makes them portable. Many models even have pneumatic or never-flat tires for a user-friendly experience. Another reason that actually increases your reach around your home is the fact that gas-powered pressure washers do not require an electric power cord, so you are never dependent on its length.
If you are worried about the weight of your new gas pressure washer, you should look for a lighter model. Alternatively, you could look for models with larger wheels for easy maneuverability so that the weight of the machine is countered effectively.
Gas Tank Size
As you may have guessed, gas-powered pressure washers run on gas that is filled into the on-board gas tanks of the machines. The tank size generally ranges between 0.25 to 0.5 gallons.
A small tank size means that you will have to refill the tank on a frequent basis. This can be a big issue in case your usage of the pressure washers is for time-bound commercial jobs that require time and effort. On the other hand, if you have small and infrequent uses for your pressure washer, you might be happy with a smaller tank size.
In general, larger tanks are easier to manage and require less effort through frequent refilling. Costs of pressure washers are generally not linked to their tank size, so this shouldn’t be something you will have to worry about.
Detergent Tanks & Detergent Dilution
One of the most common uses of a pressure washer is to soap up cars or other surfaces that need to be cleaned. In this regard, pressure washers that come with a detergent tank are extremely useful.
When it comes to buying gas-powered pressure washers, there are three things that you will have to look out for. The first is the size of the tank. You will usually find detergent tanks around the 0.5-gallon mark. The bigger the tank, the easier it is for you to soap a surface without any intermissions.
The second is the detergent dilution capability of the machine. If the machine comes with automatic detergent dilution, you are spared the hassle of pre-mixing the detergent with water. This also means that the tank can be filled with only detergent rather than a mix. So in essence, your detergent tank’s capacity is enhanced.
Finally, there are some models that come with a detergent siphon tube. This tube extracts detergent directly from the detergent bottle and dilutes it in a given ratio (often 7 to 1). If your unit has this, it completely eliminates the need for an on-board detergent tank.
So in case, you are looking for a machine that will be used for soaping on a frequent basis, you must consider all these options and weigh them against the cost.
How it Starts
Gas-powered pressure washers come with two kinds of starting mechanisms. The first one is a recoil start that involves the user having to tug the cord till the engine kicks in and takes over. The other kind of start is electric. This could involve flipping on a switch or turning a key to set the engine up for use.
With a recoil start, you will have to go through this exercise every single time you want to use the machine. It might involve tugging at the cord a few times and can be strenuous to your neck, back, and shoulders.
On the other hand, with an electric start, you get the comfort of turning a key or flipping a switch. However, you will have to keep in mind that the battery needs maintenance and you do not lose the key in case of a key-powered machine.
All in all, if you do not want to exert yourself physically, an electric start is the right one for you. Don’t forget though, you will have to look after the key and the battery.
As with any product, it’s important to read customer reviews before making a decision on which gas pressure washer to buy—as we have done to create this guide. All of the gas pressure washers listed on this page have good customer reviews.
What are some common things to look out for in customer reviews?
Customers have found that these machines are louder than they expected, with some advising the use of earplugs too. When it comes to the power, one has to keep in mind that these machines deliver a good amount of pressure. Not keeping this in mind could lead to unfortunate incidents, like the paint being removed off of a surface due to excessive pressure. Always remember to use the right attachments based on the surface.
Another common topic of discussion is the seizing of gas pressure washer engines. This generally happens when the product has not been used for a long time and might require some maintenance efforts before it starts up again. Some users also complained about the slow customer service provided. You should look for a brand that ranks high on these parameters.
Longer warranty periods are every customer’s dream. It means your machine is protected for a longer time and there is a “peace of mind” that you work with while using the machine.
Under gas-powered pressure washers, you are likely to find different warranty periods for different parts of the machine. These separate parts include the engine, pump, accessories, and frame. When it comes to warranty, there are no questions that the longer this period the better it is for you.
But you will have to keep in mind that longer warranties command higher prices. Additionally, your purpose of purchase also has a big impact. Commercial use may have no warranties protecting the machine or at least a reduced warranty period. Be sure to consider these before your purchase.
Sometimes you will find that there is not much that distinguishes one pressure washer from another. They might fall in similar price and power ranges and even fall under similar warranties. It is here that additional features can really assist you in making a decision.
One of the first features to consider is which nozzles come with the unit. These make switching from one job to another easier, and often come in 0°,15°, 25°, 40°, and soap nozzles. Some even come with turbo nozzles that generate even more power or adjustable nozzles that let you change the flow rate simply by spinning the nozzle.
Some pressure washers also come with superior pumps that are more durable and have thermal relief capabilities, while others come with MorFlex high-pressure hose that makes the hose tenacious.
You should also pay attention to the attachments that come with the machine. For example, some pressure washers come with a surface cleaner that makes cleaning sidewalks easier. These will help you wrap up your job faster.
>> Read More: Pressure Washer Buying Guide
What Gas Pressure Washers Can Be Used For
Here is a list of some things you can use electric pressure washers to clean:
- Concrete or brick walkways
- Lawn furniture (do not use 0-degree tip)
- Decks (do not use 0-degree tip)
- Stucco (do not use 0-degree tip)
- Fences (do not use 0-degree tip)
- Wooden surfaces (do not use 0-degree tip)
- Unpainted metal
- Rusty surfaces
- Ducts, gutters, and drains
- Bikes, boats, and motorcycles
- Outdoor equipment
- Moss-covered surfaces
Deciding Which Nozzle to Use
Here are examples of the nozzles many electric pressure washers come with and what each is best suited for:
Very high pressure, low flow
Stubborn grime & hard-to-reach areas
High pressure, medium flow
Hard surfaces, heavy mildew stains, rust, oil stains, paint removal
Medium pressure, medium flow
Cleaning siding, brick, wood, driveways, etc.
Lower pressure, high flow
Gentle cleaning of cars, boats, patio furniture, etc.
For applying soap & detergent
Electric vs. Gas Pressure Washers
Not sure if an electric or gas pressure washer is right for you? The following table goes over some key differences to help you decide:
1400 – 2300 PSI
1.2 – 1.8 GPM
Small to medium
Medium to large
10 – 50 lbs
50 – 90 lbs
$80 – $300
$250 – $600