Gas-powered pressure washers pack a lot more punch than their electric-powered counterparts. If you need a powerful pressure washer for tackling heavy duty jobs at home or at work, you’ll probably want to consider a gas-powered model.
The extra power comes at a price, however—these gas-powered models tend to cost significantly more than electric pressure washers. They also require regular service to keep them running in peak condition. For those reasons, it’s important to research which model best suits your line of work. It’s also important to consider which models are a good combination of price and performance.
Their performance can be evaluated through a number of elements. One of the most important is PSI (pounds per square inch), which measures the highest level of water stream intensity the machine is capable of producing. Another is GPM (gallons per minute), the amount of water used by the pressure washer in question.
You’ll also want to look at durability and pump quality. Both of these factors can help you evaluate performance over time—how long you can expect your pressure washer to operate well. Warranty coverage is also an important consideration.
Finally, it’s also critical to evaluate the amount of maintenance a machine will require. Though all gas-powered machines require regular service, some need more attention than others. If you’re not willing to regularly service your machine—for example, checking and changing oil and spark plugs—you may want to consider purchasing an electric model instead.
In our evaluations, we looked at some of the best-selling gas-powered pressure washers on the market today. We looked at their technical specifications, user reviews, and critical evaluations. Our review also takes into account warranty length and any extra features that might help make your work a little bit easier.
Check out our Top 3 choices:
Best Gas Pressure Washer Reviews
1. Simpson MSH3125-S MegaShot
The Simpson MSH3135-S Megashot isn’t the most powerful gas-powered pressure washer. But it still earns our top pick for its durability, versatility, and rugged Honda engine.
We aren’t alone in our love for this pressure washer—the Simpson Megashot is beloved by experts and homeowners alike. With a vast majority of reviewers on Amazon giving this pressure washer four or five stars, the Megashot is an easy choice for our first place.
This pressure washer can produce a stream of up to 3,100 PSI at 2.5 GPM, more than enough to handle the toughest stains and grime around the home. (Understand how pressure washers work.)
The rugged build of the Megashot is surprisingly portable, according to reviewers. The unit rolls around on ten-inch pneumatic wheels, and the compact design is lightweight enough to be maneuvered by one person.
Beneath the hood, Simpson’s power washer operates on a axial cam brass head pump. According to the Amazon product page, the pump includes “PowerBoost technology” which is meant to increase the water pressure at the nozzle.
The flexible hose and steel wand are kink- and abrasion-resistant. The pressure washer also comes equipped with stainless steel quick connect nozzle tips (including a soap applicator nozzle) for tackling a wide variety of jobs.
For many buyers, the biggest draw of the Simpson Megashot is the Honda motor. Honda’s name is equated with reliability, and it seems (at least in this unit) that the company lives up to the expectations. Most reviewers noted that the engine started quickly and ran smoothly. They said that it nearly always started on the first pull, and could run for several hours nonstop without having any issues.
Many of the owners found the Megashot to be a solid balance of power and portability, as well. Compared to other power washers of a similar caliber, Simpson’s model is more compact, more lightweight, and more maneuverable. It sits high off the ground, which gives it better clearance than other models. It also has rubber tires, which are far, far more maneuverable than hard plastic on rocks or pavement. One of the most impressive aspects of the design for us is the amount of clearance it has for a relatively low model (only about 3 feet tall).
In addition, though many experienced pressure washer owners love this product, beginners also found it easy to use. They said that for their first machine, it was easy and intuitive.
The most common negative comment (even among positive reviewers) was that the hose that came attached was made of a cheap, stiff plastic. It didn’t interfere with operation of the pressure washer in most cases, but some reviewers suggested purchasing a different hose for this product.
Another drawback that some users noticed is that the stainless steel nozzle tips sometimes fall out of the rubber holder located on the unit.
This pressure washer (like all gas-powered models) vibrates intensely during operation, and some owners said these vibrations sometimes shook the stainless steel tips out of place.
With a sturdy build, smooth engine and solid value, the strong points far outweigh the minor shortcomings of the Simpson MSH3135-S Megashot. This gas-powered pressure washer is our top pick as the best value for the money option for homeowners.
The vast majority of positive reviews from experts and owners seems to indicate the Megashot is easy to use, durable and mechanically sound. If you’re looking for a pressure washer that has enough power to tackle any job around the house at a good price, we recommend this model.
2. Generac 6595
The Generac 6595 earned our second pick for its lower price. This pressure washer might be a better option for homeowners on a tighter budget, or those who are willing to sacrifice some cleaning power to save money.
The 6595 stands at a good middle ground for buyers trying to decide between the low cost of an electric power washer and the more powerful cleaning power of a gas model. This power washer can still handily outperform electric models while occupying the same price bracket.
Despite its lower cost, the Generac 6595 still earns high ratings among owners. Fans of this pressure washer assert that its 1,500 PSI and 2.3 GPM is more than enough to tackle chores around the home.
The 6596 comes equipped with the well-regarded 196cc Generac OHV engine and an Axial cam pump. This pressure washer also includes three attachable nozzle tips, including one for soap application.
The Generac 6595 dominates its price bracket in terms of performance. This pressure washer packs more power than most competing models sold at the same cost. Previous buyers who had owned other brands in the past said that the difference in power was really phenomenal.
It’s not just sheer power alone that makes for great performance, however. The Generac 6595 also starts easily and runs smoothly, according to owners. They complimented the quick, simple assembly process. Most said they were up and running within 5 minutes. Buyers also loved its long-term performance and reliability. They said that even when they ran it for several hours in a row, it ran smoothly without overheating.
Reviewers also praised the maneuverability of this compact unit, as well as the ergonomic design of the handle of the wand. A few mentioned that the nozzle tips were useful in variety of home applications. Overall, the design of this pressure washer is very user-friendly. Previous buyers said that it was nice to have something that fit into a domestic setting rather than feeling like construction equipment.
As was the case with our top pick, the majority of customer complaints were centered around the hose. A significant number of owners noted that the hose was made of cheap plastic that was prone to kinking and breaking.
Most of the customers who complained about the plastic hose, however, felt that the unit was still worth the purchase. A higher-quality replacement hose can be purchased on Amazon for a relatively low cost.
According to some customers, the noise level of the Generac 6596 was also higher than average. The Generac motor produces more sound than the quieter Honda motor of our top pick.
Though it may not be the most powerful pressure washer you can buy, the Generac 6596 is still a great choice. Performance is better than expected for this model’s price bracket, and many of the Amazon reviewers marveled at the bargain price of such a high-quality pressure washer.
If you’re not overly concerned about getting the most powerful stream from your pressure washer, the Generac 6596 is a solid compromise. Compact, durable, and high-performing, this pressure washer will no doubt be one of your go-to tools for years to come.
3. Generac 6602 OneWash
Our third pick is also made by the reputable Generac company. The Generac 6602 OneWash, however, offers a lot more power and a few very handy features for residential jobs.
Of course, higher performance and more features means a higher price tag. But if you’re looking for an efficient and powerful cleaning machine, the 6602 OneWash model is definitely worth a look.
This Generac model operates at 3,100 PSI and 2.8 gallons per minute, giving it a slight edge over the Simpson Megashot in terms of cleaning ability. The engine is the highly rated Generac 212cc OHV engine.
One of the interesting features that makes this pressure washer really stand out is the variable pressure control dial. This feature is part of the “4-in-1 cleaning system” that Generac advertises in this model. The different levels are designed to allow users to switch easily between pressure levels to accommodate the needs of different jobs around the home, from washing cars to hosing down concrete.
Like our other Generac model mentioned here, the trigger gun of this unit is also designed for ergonomic comfort. It also comes with 3 applicator nozzle tips, with one tip used for soap.
As the unit with the highest cleaning power on this list, the Generac has a lot to offer. Like our second choice, consumers have a good deal of confidence in the Generac motors included in their pressure washers. At roughly the same price as the Simpson MegaShot, the 6602 OneWash makes for formidable competition.
The pressure control feature is also a useful tool not seen on many other units. The control panel is conveniently consolidated on the front of the unit. Between the variable pressure and the additional spray tips, this power washer can be fine-tuned to handle any specific task. Previous buyers said they used it for cleaning concrete around walks and garages, taking dirt and mold off house siding, washing their car, and cleaning barbecues, among many other things. They said it worked perfectly well, without harming any of the objects in question.
Assembly out of the package was also very easy, according to reviewers. Most reported they were able to remove the pressure washer from the packaging, assemble the unit and start it up very quickly.
Interestingly, the majority of complaints were regarding the packaging and customer service at Generac. A number of owners reported their orders came with parts loose or missing.
Reports about customer service were conflicting. Many owners claimed that the customer service was responsive, friendly and helpful. In contrasts, however, there were a number of customer complaints stating the opposite.
These complaints weren’t present on the Generac 9525, which leads us to suspect that a few isolated incidents may have been responsible for the negative reviews. Regardless, few negative reviewers took issue with the mechanic elements of this machine.
The Generac 6603 OneWash packs a lot of cleaning power for the price. Though an unusually high number of complaints about customer service kept this unit from the top spot, the power washer itself seems to perform well enough to outweigh this negative element.
The additional features—particularly the variable pressure controls—also add to the appeal of this pressure washer. For homeowners who need a powerful yet versatile unit at a good value, the Generac 6603 is a solid contender.
Which Gas Pressure Washer is Right for You?
Our favorite model is the Simpson MSH3125-S MegaShot. The durable and reliable Honda motor alone would warrant a purchase. Combined with its compact size and ease of use, the Megashot is a gas-powered pressure washer that is suited for both beginner and experienced pressure washers alike.
The Generac 6595 is also a great option if you don’t mind sacrificing a bit of power to save a lot of money. Despite its low cost, this power washer still performs consistently well and leaves the vast majority of owners pleased with their purchase.
If you’re looking for high-performance cleaning power, the Generac 6602 is also worth a look. It has all the benefits of the 6595, but with more great features and better pressure. Of the models listed here, this one is the most powerful.
If you’re looking for a high-powered pressure washer for on-the-job work, check out our Top Commercial Pressure Washers. If you’re looking for something a little bit smaller, lighter and less expensive, read our Best Electric Pressure Washers or visit our Best Pressure Washer Page.