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Simpson ALH3425-S Spec Review

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 Washer
Simpson ALH3425-S 3600PSI Gas Pressure Washer
Simpson ALH3425-S 3600PSI Gas Pressure Washer
Simpson ALH3425-S 3600PSI Gas Pressure Washer
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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

In a nutshell, the Simpson ALH3425-S is a heavy duty, commercial pressure washer, which not only offers an all-around versatile cleaning experience, but that also allows:

  • spot cleaning of hard, unpainted surfaces or high reach areas
  • intense cleaning of hard, unpainted surfaces
  • cleaning of painted and frail surfaces
  • use 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

The Simpson ALH3425-S's triplex pump, powered by a 196 cc (5.5 hp) engine, can provide a pressure of up to 3600 PSI (approximately 60 times more than a standard garden hose) and a flow of up to 2.5 GPM (CETA-certified values). The Simpson ALH3425-S thus has a cleaning power of 9000 Cleaning Units.

A classic pull-start mechanism is responsible for starting the gas-powered pressure washer’s Honda GX200 engine.

The fuel is stored in a steel tank, which can hold up to 0.83 gallon of gasoline.

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.

Most users can maneuver this model easily, as it weighs just 78 lbs. Since the 196 cc Honda GX200 engine and triplex pump account for a large part of its weight, Simpson's utilization of an aluminum frame keeps the unit at a reasonable weight. However, the two 10" pneumatic wheels allow the ALH3425-S to be easily manipulated and maneuvered.

Main Features

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: Even though the device doesn't have a soap tank, detergent is supplied by a siphon hose. The automatic soap dilution mechanism of the Simpson ALH3425-S will dilute the detergent with a 7:1 ratio. The detergent will be added automatically to the water when a soap nozzle is attached.
  • Pressure hose: The 35 ft ⌀5/16" high-pressure hose, which is included with the device, can be stored neatly on the unit itself when idle, using a set of convenient hooks.
  • Spray gun and wand: The included classic ergonomic spray gun and its steel wand can be easily stored in a side hook.
  • Nozzles: The 5 included nozzles, and the respective surfaces they’re appropriate for, are listed in the table below.
 



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: The Simpson ALH3425-S allows you to be always fully prepared, as it features a handy storage area, where nozzles and accessories can be stored.
  • Safety: Safety of operation is enhanced by a low oil protection, a thermal relief valve (which helps to prevent internal pump damage) 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 wand, spray gun, soap hose, pressure hose and oil.
  • Emissions: The Simpson ALH3425-S is EPA-approved and CARB-compliant. And so, this pressure washer is available for sale and purchase in any of the 50 states, including California.

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, with a maximum pressure output of 3600 PSI, has an average pressure output, when considering gas-powered units in $600 to $700 price range. If you're going after the highest possible power of the water stream, one of the best in this price range is the Simpson PS60843 that can reach up to 4400 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. In case you are looking for a device which can most efficiently rinse away debris in the current price range, the Simpson PS60843 has the highest GPM of 4.
  • The 9000 Cleaning Units (PSI x GPM), of the ALH3425-S result in an average cleaning efficiency, compared to similarly priced gas-powered units. In case you are looking for the highest overall cleaning power, in this price range, one of the current champions is the Simpson PS60843 and its 17600 Cleaning Units.

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
AVERAGE SPECS:
  • Decent PSI for the price
  • Decent CU for the price
WEAKNESSES:
  • No electric start
  • 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.

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

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.

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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