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Simpson ALH4240 - Spec Breakdown

The Simpson Aluminum ALH4240 is a gas-powered pressure washer offering a maximum water pressure of 4200 PSI and flow of 4 GPM. (Read full specs)

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Features and Specifications

General
FuelGas-Powered
HandlingWheelbarrow
WaterCold (100°F max.)
PSI4200
GPM4
Cleaning Units16800
Engine389 cc 11.7 HP Honda GX390 OHV 4-stroke
PumpCAT Triplex
SeriesAluminum
Other model numbers60688
Features
FrameAluminum
Soap injectionVia siphon hose
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose50 ft, ⌀3/8
Hose storageHooks
Misc
Dimensions
(L x W x H)
Approx. 38 x 23.5 x 26 in
Weight133 lbs
Pressure controlDial-N-Wash® + unloader valve
Wheels2 wheels, ⌀13", pneumatic
Included accessoriesOil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles, Dial-N-Wash® pressure regulator
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.

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Description

The SIMPSON ALH4240 is designed to meet the rigorous demands of the cleaning pro. Heavy-duty pressure washers with flow and reliability. Perfect for contractors who specialize in deck cleaning, wood restoration, paint preparation, graffiti removal, and all other professional cleaning services. (source: Simpson (opens in a new tab))

Zoom on the Simpson ALH4240

In summary, the Simpson ALH4240 is a heavy duty, commercial pressure washer, that offers an all-around versatile cleaning experience, and also:

  • spot cleaning of hard, paintless surfaces and reaching far-away areas
  • thorough cleaning of hard, paint-free surfaces
  • cleaning of painted and fragile surfaces
  • applying detergent and cleaning solutions

Ahead are presented its power characteristics and design, its main features and any other additional features.

Power

The Simpson ALH4240 in use

The Simpson ALH4240

Its triplex pump, which utilizes a powerful 389 cc (11.7 hp) engine, may deliver a pressure of up to 4200 PSI (almost 70 times more than a standard garden hose) and a flow of up to 4 GPM. These values correspond to a cleaning power of 16800 Cleaning Units.

This gas-powered pressure washer’s Honda GX390 engine is started by a traditional pull-start mechanism.

A steel fuel tank with a maximum capacity of 1.6 gallon is used to store gasoline.

Design & Handling

The wheelbarrow design of the Simpson ALH4240 grants mobility and stability to the unit. The aluminum frame allows the device to remain highly durable, as it will not rust. The handle adds to the ALH4240 convenience of transport.

The device weighs 133 lbs and thus, is far from lightweight. Transporting and manually lifting it may therefore pose a challenge. A key role in its final weight is played by its 389 cc Honda GX390 engine, the triplex pump and aluminum frame. However, the unit’s two 13" pneumatic wheels are crucial to its maneuverability, since they provide a smooth method of manipulation on the job.

Main Features

The Simpson ALH4240 in use

The Simpson ALH4240

The Simpson ALH4240 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. If a soap nozzle is attached, the device will proceed to add the detergent to the water automatically.
  • Pressure hose: Using a set of convenient hooks, the included 50 ft ⌀3/8" high-pressure hose can be easily stored on the unit when it is not running.
  • Spray gun and wand: Both the classic ergonomic spray gun and its steel wand may be conveniently stored in a side hook.
  • Nozzles: The following table illustrates the 5 included nozzles, along with the surfaces which they are the most suitable 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 ALH4240

Some of the included accessories

  • Dial-N-Wash®: Simpson’s Dial-N-Wash® is an adjustable pressure regulator that allows you to choose a desired pressure for your specific cleaning application. High, medium and low pressure settings can be switched between easily by a simple twist. Its design assures its compatibility with most pressure washer standard spray wands and standard guns with threaded fittings.
  • Onboard storage: Stay prepared for any job with Simpson ALH4240'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 thermal relief valve (which helps to prevent internal pump damage), a trigger lock mechanism (which prevents accidental operation) and a low oil protection.
  • Accessories: Included with the Simpson ALH4240 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 pressure regulator, soap hose, wand, oil, spray gun and pressure hose.
  • Emissions: The Simpson ALH4240 is EPA-approved and CARB-compliant. Therefore, the sale and purchase of this pressure washer is permitted in all of the 50 states, including California.

Product Videos

The Simpson ALH4240's performance versus other pressure washers

The following charts are provided to give you an idea of how the key specs of the Simpson ALH4240 compare to similarly priced pressure washers.

  • The Simpson ALH4240, which can reach up to 4200 PSI, has one of the highest pressure outputs of the gas-powered units that cost between $825 and $900.
  • With a maximum GPM of 4 (gallons per minute), this washer belongs to the best in terms of water flow, in its respective price range.
  • The ALH4240, which reaches up to 16800 Cleaning Units (PSI x GPM) is one of the most efficient, in comparison to its similarly priced counterparts.
According to our stats, the following comparison is pretty popular: Simpson ALH4240 vs Simpson PS4240.

Price comparison

As you can see from this interactive chart, when compared to other gas-powered washers between 16500 and 17000 Cleaning Units, the Simpson ALH4240 is on the cheap side of the price range.

It can therefore be a really good buy if you're looking to acquire a budget pressure washer.

The bottom line

STRENGTHS:
  • Inexpensive
  • Triplex pump
  • Honda engine
  • Designed to be stable
  • Aluminum frame
  • Good range of nozzles included
  • Onboard storage
  • Several security features
  • CARB-compliant
  • 10 year (limited) warranty
  • High PSI for the price
  • High GPM for the price
  • High CU for the price
WEAKNESSES:
  • No soap tank

Do you own the Simpson ALH4240 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 ALH4240 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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