Simpson ALH3425-S - 3600 PSI 2.5 GPM Gas Pressure Washer With Honda Engine
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)
Amazon 
Tractor Supply 
Sam's Club 
Acme Tools 
Zoro 
Global Industrial 
Farm & Fleet Price history for the Simpson ALH3425-S
Page Content
Description
Built for professional grade performance, the SIMPSON® Aluminum Series 3600 PSI @ 2.5 GPM pressure washer is built to perform. With a powerful Honda engine, reliable triplex pump and ultra lightweight aircraft grade aluminum frame, this gas pressure washer is great for construction, equipment upkeep, facility & fleet maintenance cleaning.
Zoom on the Simpson ALH3425-S
In a nutshell, the Simpson ALH3425-S is a commercial pressure washer, which not only offers an all-around versatile cleaning experience, but that also allows:
- targeted spot cleaning for hard, unpainted surfaces, reaching elevated areas, and thoroughly removing stubborn stains
- overall cleaning of hard surfaces, washing vehicles, and prepping surfaces for painting
- delicate surface cleaning, andbroad area cleaning with reduced pressure
- utilizing cleaning solutions, and rinsing surfaces clean
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
Fueled by a 196cc (5.5 hp) engine, its triplex pump can generate a forceful pressure of 3600 PSI (roughly 60 times that of a standard garden hose) and a flow rate of up to 2.5 GPM (CETA-certified values). When these values are taken together, they yield a cleaning power of 9000 Cleaning Units.
The Honda GX200 engine of this gas-powered pressure washer is initiated by a classic pull-start mechanism.
Fuel for the pressure washer is housed in a steel tank capable of holding up to 0.83 gallon of gasoline.
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.
At 78 lbs, this unit's substantial weight makes it quite a challenge for users to lift and maneuver, particularly on uneven surfaces where its heft can become even more apparent. The major reasons for its heavy weight are its 196cc Honda GX200 engine, the triplex pump and aluminum frame. 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
The Simpson ALH3425-S comes with a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, which are detailed below.
- Soap injection: While not equipped with a soap tank, the device maintains detergent supply through a siphon hose. Utilizing an automatic soap dilution mechanism, the Simpson ALH3425-S accurately mixes detergent to the defined ratio of 7:1, enhancing cleaning efficiency. Attachment of a soap nozzle prompts the pressure washer to automatically introduce and blend the detergent with the water.
- Pressure hose: The unit comes equipped with an included 35 ft ⌀5/16" high-pressure hose, which can be neatly stored on the unit when idle, thanks to a set of convenient hooks, ensuring easy access and organization.
- Spray gun and wand: A side hook allows for an easy storage of the included classic ergonomic spray gun and its steel wand.
- Nozzles: The following table provides information on the 5 included nozzles and their recommended surface uses.
0° | 15° | 25° | 40° | Soap | |
|---|---|---|---|---|---|
| Concrete, brick, masonry | |||||
| Siding, gutters, house | |||||
| Fencing, deck, patio | |||||
| Lawn equipment, boat, RV |
Please note: The shapes of the nozzles depicted above are for illustration purposes and may vary. Symbols used include a for 'Not recommended,' a for 'Suitable,' and an for 'Use with caution.'
Other Features
Some of the included accessories
- Onboard storage: The Simpson ALH3425-S features a handy storage area, which allows you to neatly store nozzles and accessories and be always prepared by having everything needed at hand.
- Safety: Safety of operation is enhanced by a low oil protection, a trigger lock mechanism (which prevents accidental operation) and a thermal relief valve (which helps to prevent internal pump damage).
- Accessories: Included with the Simpson ALH3425-S are also the owner's manual (opens in a new tab) and some basic documentation to get you promptly started, along with several accessories, such as spray gun, soap hose, pressure hose, oil and wand.
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.
- With 3600 PSI, the Simpson ALH3425-S ranks as one that can reach an above average pressure, amongst the gas-powered products that cost between $700 and $800. If your priority is the highest possible power of the water stream, in this price range, we suggest checking out the Simpson PS60869, which reaches up to 4000 PSI.
- In the aforementioned price range, this washer, with 2.5 GPM (gallons per minute), is placed on the lower end of the GPM scale. In case you are looking for a device which can most efficiently rinse away debris in the current price range, the Briggs & Stratton 20507 has the highest GPM of 4.
- With 9000 Cleaning Units (PSI X GPM), the ALH3425-S is on the low end when compared to other similarly priced gas-powered devices. If you consider the highest overall cleaning power as a really important factor, the Briggs & Stratton 20507 and its 16000 Cleaning Units has one of the highest cleaning efficiency of all the similarly priced units.
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
- No soap tank
- Low GPM for the price
- Low CU for the price
Do you own the Simpson ALH3425-S and agree (or disagree) with these strengths and weaknesses?
Let us know and write your own review.
Features and Specifications
| Fuel | Gas-Powered |
|---|---|
| Engine | 196cc 5.5 HP Honda GX200 OHV 4-stroke |
| Pump | AAA Triplex |
| Water | Cold (100°F max.) |
| PSI | 3600 |
| GPM | 2.5 |
| Cleaning Units | 9000 |
| Pressure control | Valve |
| Frame | Aluminum |
|---|---|
| Handling | Wheelbarrow |
| Wheels | 2 wheels, ⌀10", pneumatic |
| Weight | 78 lbs |
| Dimensions | Approx. 34 x 21 x 24 in (L x W x H) |
| Hose storage | Hooks |
| 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 |
| Security | Low oil, trigger lock and thermal relief valve |
|---|---|
| Emissions | EPA |
| Included accessories | Oil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles |
| Warranty | 10 years |
| Series | Aluminum |
| Other model numbers | 60689, 60768 |
| UPC | 879399001352 |
We've taken extra care to research and verify each of the specifications above. That said, occasional mistakes or omissions are still possible. If you spot any missing or inaccurate information, feel free to suggest a correction so we can address it.
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.
