The Simpson Aluminum ALH3425-S is a gas-powered pressure washer offering a maximum water pressure of 3600 PSI and flow of 2.5 GPM. (Read full specs)
Farm & Fleet 
Acme Tools 
Tractor Supply 
Global Industrial 
eBay 
Sam's Club 
Amazon Page Content
Features and Specifications
| Fuel | Gas-Powered |
|---|---|
| Handling | Wheelbarrow |
| Water | Cold (100°F max.) |
| PSI | 3600 |
| GPM | 2.5 |
| Cleaning Units | 9000 |
| Engine | 196cc 5.5 HP Honda GX200 OHV 4-stroke |
| Pump | AAA Triplex |
| Series | Aluminum |
| Other model numbers | 60689, 60768 |
| Frame | Aluminum |
|---|---|
| Soap injection | Via siphon hose |
| Soap dilution | 7:1 |
| Nozzles | 0°, 15°, 25°, 40°, Soap |
| Quick connect nozzles | Yes |
| Onboard storage | Yes |
| Hose | 35 ft, ⌀5/16 |
| Hose storage | Hooks |
| Dimensions (L x W x H) | Approx. 34 x 21 x 24 in |
|---|---|
| Weight | 78 lbs |
| Pressure control | Valve |
| Wheels | 2 wheels, ⌀10", pneumatic |
| Included accessories | Oil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles |
| Security | Low oil, trigger lock and thermal relief valve |
| Emissions | EPA |
| Warranty | 10 years |
| UPC | 879399001352 |
Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.
Description
Zoom on the Simpson ALH3425-S
In summary, the Simpson ALH3425-S is a heavy duty, commercial pressure washer, that offers an all-around versatile cleaning experience, and also:
- spot cleaning of hard, unpainted surfaces, reaching high areas, and removing stubborn stains
- broad cleaning of hard surfaces, vehicle washing, and surface preparation for painting
- soft cleaning of delicate surfaces, and gentle cleaning for larger areas with low pressure
- using cleaning solutions, and rinsing surfaces to remove residue
The following sections will present you in detail its power characteristics and design, its main features and all the additional features it has to offer.
Power
The Simpson ALH3425-S
With a 196cc (5.5 hp) engine, its triplex pump delivers a pressure of 3600 PSI (roughly 60 times more than a standard garden hose) and a flow of up to 2.5 GPM (CETA-certified values), resulting in the Simpson ALH3425-S's cleaning power of 9000 Cleaning Units.
The Honda GX200 engine of this gas pressure washer is activated by pulling a starter cord, following a traditional approach.
Gasoline is stored in a steel fuel tank with a maximum capacity of 0.83 gallon.
Design & Handling
The Simpson ALH3425-S's wheelbarrow-style design enhances both mobility and stability, enabling seamless navigation and consistent performance, even on rugged terrain. Built with an aluminum frame, this pressure washer prioritizes mobility and longevity, offering corrosion resistance and lightweight design for ease of use and durability. The handle adds to the ALH3425-S convenience of transport.
Tipping the scales at 78 lbs, this unit's weight presents a notable challenge for users, especially when it comes to lifting and moving it, particularly over uneven ground. Its 196cc Honda GX200 engine, the triplex pump and aluminum frame are mainly responsible for its heavy weight. Despite this, the presence of two 10" pneumatic wheels reduces the complexity of moving the ALH3425-S, even on rugged surfaces.
Main Features
The Simpson ALH3425-S
Along with the Simpson ALH3425-S itself, the package also includes a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, which are discussed in further detail below.
- Soap injection: While the device doesn't feature a soap tank, detergent supply is ensured by a siphon hose. With its automatic soap dilution mechanism, the Simpson ALH3425-S simplifies the process of blending detergent to the prescribed ratio of 7:1. Upon attaching a soap nozzle, the pressure washer seamlessly integrates the detergent into the water flow.
- Pressure hose: Utilizing a set of convenient hooks, the unit offers a convenient solution for storing the included 35 ft ⌀5/16" high-pressure hose when it's not in use, keeping it neatly organized.
- Spray gun and wand: A side hook allows for an easy storage of the included classic ergonomic spray gun and its steel wand.
- Nozzles: Find details on the 5 included nozzles and their recommended surface applications in the table below.
0° | 15° | 25° | 40° | Soap | |
|---|---|---|---|---|---|
| Concrete, brick, masonry | Use with caution | Suitable | Suitable | Suitable | Suitable |
| Siding, gutters, house | Not recommended | Use with caution | Use with caution | Suitable | Suitable |
| Fencing, deck, patio | Not recommended | Use with caution | Use with caution | Suitable | Suitable |
| Lawn equipment, boat, RV | Not recommended | Use with caution | Use with caution | Use with caution | Suitable |
Kindly note: The shapes of the nozzles depicted above are for illustrative purposes and may vary. Symbols indicate suitability, with a red cross signifying 'Not recommended,' a green check for 'Suitable,' and an orange check for 'Use with caution.'
Other Features
Some of the included accessories
- Onboard storage: With the Simpson ALH3425-S's handy storage area, you’ll always have all the necessary nozzles and accessories at hand and thus, you’ll be fully prepared for any job.
- Safety: Safety of operation is enhanced by a thermal relief valve (which helps to prevent internal pump damage), a low oil protection and a trigger lock mechanism (which prevents accidental operation).
- Accessories: Besides the usual owner's manual (opens in a new tab) and documentation to get you promptly started, the Simpson ALH3425-S comes with soap hose, oil, wand, pressure hose and spray gun.
Product Video
The Simpson ALH3425-S's performance versus other pressure washers
The following charts are provided to give you an idea of how the key specs of the Simpson ALH3425-S compare to similarly priced pressure washers.
- Delivering a maximum pressure of 3600 PSI, the Simpson ALH3425-S is one of the gas-powered products renowned for above-average water pressure output, in the $625 to $700 price range. Prioritizing the highest water stream power? Check out the Westinghouse WPX3800—a top contender in this price range, delivering up to 3800 PSI.
- The achievable water flow of this washer, which reaches 2.5 GPM (gallons per minute) can be described as low, compared to other devices in its price range. If maximum rinsing efficiency is your top priority, one of the devices with the highest water flow in the same price range is the Westinghouse WPX3800, with a GPM of 3.6.
- Boasting 9000 Cleaning Units (PSI X GPM) in total, the ALH3425-S positions itself in the average cleaning efficiency range for devices of similar pricing and fuel type. If you are after the highest overall cleaning power, the Westinghouse WPX3800 with its 13680 Cleaning Units is one of the products that can achieve the highest cleaning efficiency in this price range.
Here's a list of the most popular specific comparisons:
Price comparison
As you can see from these interactive charts, when compared to other gas-powered washers between 9000 and 9500 Cleaning Units, the Simpson ALH3425-S is on the average side of the price range.
Therefore, this pressure washer nicely fits in the expected budget for this kind of cleaning power.
The bottom line
- In the expected price range
- 10 year (limited) warranty
- Triplex pump
- Honda engine
- Designed to be stable
- Aluminum frame
- Good range of nozzles included
- Automatic detergent dilution
- Onboard storage
- Several security features
- High PSI for the price
- Decent CU for the price
- No soap tank
- Low GPM for the price
About Simpson
Simpson has over 50 years of experience making quality products for the outdoor power equipment industry. Part of the FNA Group based in Pleasant Prairie, Wisconsin since 2006, they are a vertically-integrated company, meaning most of the parts and accessories are manufactured and assembled by them. Their manufacturing facilities are international, but their gas-powered pressure washers are made in the USA. With the company motto "Driven by Performance", Simpson continues to offer a great variety of pressure-washing systems for the homeowner or the professional contractor.
Warranty Information
The Simpson ALH3425-S is covered under a warranty for up to 10 years. This warranty may be limited and may not cover all parts of the unit.
For more information about the warranty of Simpson pressure washers, please contact the Simpson Customer Support: 1-877-362-4271.
