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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)

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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

FuelGas-Powered
HandlingWheelbarrow
WaterCold (100°F max.)
PSI3600
GPM2.5
Cleaning Units9000
Engine196cc 5.5 HP Honda GX200 OHV 4-stroke
PumpAAA Triplex
SeriesAluminum
Other model numbers60689, 60768
FrameAluminum
Soap injectionVia siphon hose
Soap dilution7:1
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose35 ft, ⌀5/16
Hose storageHooks
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
EmissionsEPA
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 is a heavy duty, commercial pressure washer, that provides its users with an all-around versatile cleaning experience, and enables:

  • pinpoint spot cleaning of hard, unpainted surfaces, accessing high areas, and successfully removing stubborn stains
  • comprehensive cleaning of hard surfaces, vehicle washing, and readying surfaces for painting
  • soft cleaning of delicate surfaces, and gentle cleaning for larger areas with low pressure
  • applying detergent and cleaning solutions, and rinsing surfaces

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 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.

For this gas-powered pressure washer, the Honda GX200 engine is started using a time-tested pull-start mechanism.

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

Design & Handling

With its wheelbarrow-inspired design, the Simpson ALH3425-S aims for excellent mobility and stability, enabling effortless maneuvering and dependable performance across diverse environments. The aluminum frame offers both mobility and durability, providing corrosion resistance/strong> and easy handling for prolonged use in various environments. The handle adds to the ALH3425-S convenience of transport.

With its weight clocking in at 78 lbs, this unit's heftiness can't be ignored, presenting significant difficulties for users who need to lift and transport it, especially over uneven terrain. Its 196cc Honda GX200 engine, the triplex pump and aluminum frame add up to a large chunk of the device's weight. However, the incorporation of two 10" pneumatic wheels makes navigating the ALH3425-S less cumbersome, even on uneven terrain.

Main Features

The Simpson ALH3425-S in use

The Simpson ALH3425-S

The Simpson ALH3425-S's package includes a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, with a more detailed description below.

  • Soap injection: Even though the device doesn't have a soap tank, detergent is supplied by a siphon hose. The detergent is diluted with a 7:1 ratio by the Simpson ALH3425-S's automatic soap dilution mechanism. Upon attaching a soap nozzle, the pressure washer seamlessly integrates the detergent into the water flow.
  • Pressure hose: For easy organization, the included 35 ft ⌀5/16" high-pressure hose can be stored on the unit using a set of convenient hooks when it's not in use, ensuring a clutter-free workspace.
  • Spray gun and wand: A side hook allows for an easy storage of the included classic ergonomic spray gun and its steel wand.
  • Nozzles: Below, you'll find a table outlining the 5 included nozzles and their recommended surfaces.


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

Please note: The shapes of the nozzles depicted above are for illustration purposes and may vary. Symbols used include a red cross for 'Not recommended,' a green check for 'Suitable,' and an orange check for 'Use with caution.'

Other Features

Some of the accessories of the Simpson ALH3425-S

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: Besides the usual owner's manual (opens in a new tab) and documentation to get you promptly started, the Simpson ALH3425-S comes with oil, soap hose, wand, spray gun and pressure hose.

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.

  • Capable of delivering a maximum pressure of 3600 PSI, the Simpson ALH3425-S is among the gas-powered products known for achieving the highest water pressure, in the $500 to $600 price range.
  • In its respective price range, the water flow of this washer, 2.5 GPM (gallons per minute), ranks as average. If rinsing away debris most efficiently is your priority, one of the devices with the highest GPM in this price range is the Westinghouse WPX3600, which can reach up to 2.7 GPM.
  • With a rather impressive value of 9000 Cleaning Units (PSI X GPM), the ALH3425-S has a higher cleaning efficiency compared to similarly priced devices. If prioritizing the highest overall cleaning power, the Westinghouse WPX3600 with its 9720 Cleaning Units may stand out for its exceptional cleaning efficiency among 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

STRENGTHS:
  • 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
  • High CU for the price
AVERAGE SPECS:
  • Decent GPM for the price
WEAKNESSES:
  • No soap tank

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, 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.

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