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Simpson ALH3425-S - Spec Breakdown

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)

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Simpson ALH3425-S 3600PSI Gas Pressure WasherSimpson ALH3425-S 3600PSI Gas Pressure WasherSimpson ALH3425-S 3600PSI Gas Pressure WasherSimpson ALH3425-S 3600PSI Gas Pressure Washer
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Features and Specifications

General
FuelGas-Powered
HandlingWheelbarrow
WaterCold (100°F max.)
PSI3600
GPM2.5
Cleaning Units9000
Engine196 cc 5.5 HP Honda GX200 OHV 4-stroke
PumpAAA Triplex
SeriesAluminum
Other model numbers60689, 60768
Features
FrameAluminum
Soap injectionVia siphon hose
Soap dilution7:1
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose35 ft, ⌀5/16
Hose storageHooks
Misc
Dimensions
(L x W x H)
Approx. 34 x 21 x 24 in
Weight78 lbs
Pressure controlValve
Wheels2 wheels, ⌀10", pneumatic
Included accessoriesOil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles
SecurityLow oil, trigger lock and thermal relief valve
EmissionsCARB, EPA
Warranty10 years
UPC879399001352

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.

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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. (source: Simpson (opens in a new tab))

Zoom on the Simpson ALH3425-S

The Simpson ALH3425-S, a heavy duty, commercial pressure washer, gives its user an all-around versatile cleaning experience, topped off by the following features:

  • spot cleaning of hard, unpainted surfaces and high-reach cleaning
  • thorough cleaning of hard, paint-free surfaces
  • cleaning of painted and frail surfaces
  • application of detergent and cleaning solutions

Its power characteristics and design, its main features and all its additional features are presented ahead.

Power

The Simpson ALH3425-S in use

The Simpson ALH3425-S

With a 196 cc (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-powered pressure washer gets started by a classic pull-start mechanism.

Gasoline is stored in a steel fuel tank with a maximum capacity of 0.83 gallon.

Design & Handling

The wheelbarrow design of the Simpson ALH3425-S grants mobility and stability to the unit. The aluminum frame ensures the device's durability, as it will not rust. The handle adds to the ALH3425-S convenience of transport.

With a weight of 78 lbs, the unit can be easily maneuvered by most users. As its 196 cc Honda GX200 engine and triplex pump account for a good portion of that weight, Simpson's choice of an aluminum frame allows the device to stay at a reasonable weight. Nethertheless, thanks to its two 10" pneumatic wheels, the ALH3425-S remains very easy to manipulate and maneuver.

Main Features

The Simpson ALH3425-S in use

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: Detergent is fed in through a siphon hose, since the device lacks a soap tank. The detergent is diluted with a 7:1 ratio by the Simpson ALH3425-S's automatic soap dilution mechanism. When a soap nozzle is connected, the detergent will be added automatically to the water.
  • Pressure hose: The included 35 ft ⌀5/16" high-pressure hose can be neatly stored on the unit when idle thanks to a set of convenient hooks.
  • 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 table below shows you the 5 included nozzles, as well as the surfaces they're the most appropriate for.
 


15°

25°

40°

Soap
Concrete, brick, masonryUse with cautionSuitableSuitableSuitableSuitable
Siding, gutters, houseNot recommendedUse with cautionUse with cautionSuitableSuitable
Fencing, deck, patioNot recommendedUse with cautionUse with cautionSuitableSuitable
Lawn equipment, boat, RVNot recommendedUse with cautionUse with cautionUse with cautionSuitable

Note: The shape of the nozzles above is for illustration purposes only and may differ.
Red cross: Not recommended. Green check: Suitable. Orange check: Use with caution.

Other Features

Some of the accessories of the Simpson ALH3425-S

Some of the included accessories

  • Onboard storage: Stay prepared for any job with Simpson ALH3425-S's handy storage area, which allows you to neatly store any nozzles and accessories which you may need for the job.
  • Safety: Safety of operation is enhanced by a trigger lock mechanism (which prevents accidental operation), a thermal relief valve (which helps to prevent internal pump damage) and a low oil protection.
  • Accessories: On top of an owner's manual (opens in a new tab) and the usual documentation to get you swiftly started, the Simpson ALH3425-S also comes with pressure hose, soap hose, wand, spray gun and oil.
  • Emissions: The Simpson ALH3425-S is EPA-approved and CARB-compliant. Thus, selling and purchasing this pressure washer is allowed in each of the 50 states, including California.

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.

  • The Simpson ALH3425-S, which can reach up to 3600 PSI, has one of the higher pressure outputs of the gas-powered units that cost between $625 and $700. As for the device with the most powerful water stream, in this price range, one of the top products is the A-iPower PWF4200SH with 4200 PSI.
  • When compared to devices in the above-mentioned price range, this washer and its 2.5 GPM (gallons per minute), is on the lower end of the achievable water flow. If being able to rinse away debris as efficiently as possible is your priority, one of the products with the highest GPM in this price range is the A-iPower PWF4200SH, with 4 GPM.
  • The 9000 Cleaning Units (PSI X GPM), of the ALH3425-S result in an average cleaning efficiency, compared to similarly priced gas-powered units. If you are after the highest overall cleaning power, the A-iPower PWF4200SH with its 16800 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 this interactive chart, 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

STRENGTHS:
  • In the expected price range
  • Triplex pump
  • Honda engine
  • Designed to be stable
  • Aluminum frame
  • Good range of nozzles included
  • Automatic detergent dilution
  • Onboard storage
  • Several security features
  • CARB-compliant
  • 10 year (limited) warranty
  • High PSI for the price
AVERAGE SPECS:
  • Decent CU for the price
WEAKNESSES:
  • No soap tank
  • Low GPM 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.

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. 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.

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