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Simpson MSH3125-S Spec Review

The Simpson MegaShot MSH3125-S is a gas-powered pressure washer offering a maximum water pressure of 3200 PSI and flow of 2.5 GPM. (Read full specs)

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Description

With the SIMPSON MegaShot 3200 PSI @ 2.5 GPM pressure washer, you receive an optimum performance for minimum effort. Clean siding, driveways, cars, prep for painting and more quickly and easily. This is a perfect option for homeowners, because it’s lightweight, easy to maneuver and can be transported by one person. The MSH3125 is powered by a Honda engine and comes with a 25’ hose, ergonomic spray gun and 5 Quick-Connect nozzles. (source: Simpson (opens in a new tab))

Zoom on the Simpson MSH3125-S

In a nutshell, the Simpson MSH3125-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 and high-reach cleaning
  • intense cleaning of hard, unpainted surfaces
  • cleaning of painted and fragile surfaces
  • applying detergent and cleaning solutions

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 MSH3125-S in use

The Simpson MSH3125-S

Powered by a 187 cc (6 hp) engine, its axial cam pump can deliver a pressure of 3200 PSI (around 53 times more than a standard garden hose) and a flow of up to 2.5 GPM (values claimed by the manufacturer). Combined, these values mean that the Simpson MSH3125-S has a cleaning power of 8000 Cleaning Units.

The Honda GC190 engine of this gas-powered pressure washer relies on an old-school pull-start mechanism to get started.

Gasoline storage is facilitated by a fuel tank with a maximum capacity of 0.48 gallon.

Design & Handling

The wheelbarrow design of the Simpson MSH3125-S grants mobility and stability to the unit. Its sturdy welded steel frame provides longevity to the assembly. The handle adds to the MSH3125-S convenience of transport.

Weighing 55 lbs, the unit is easy to maneuver by most people. Its 187 cc Honda GC190 engine and welded steel frame all add up to a substantial part of that weight. Since the MSH3125-S has a set of two 10" pneumatic wheels, it is still easily maneuvered and manipulated.

Main Features

The Simpson MSH3125-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 automatic soap dilution mechanism of the Simpson MSH3125-S will dilute the detergent with a 7:1 ratio. Whenever a soap nozzle is connected, the detergent is automatically added to the water.
  • Pressure hose: A neat storage for the included 25 ft ⌀1/4" high-pressure hose is facilitated by 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 5 nozzles included with the device, and the respective surfaces which they’re the most suitable for, are shown in the following table.
 


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 MSH3125-S

Some of the included accessories

  • Onboard storage: Stay prepared for any job with Simpson MSH3125-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 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 MSH3125-S comes with oil, spray gun, wand, soap hose and pressure hose.
  • Emissions: The Simpson MSH3125-S 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 MSH3125-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 MSH3125-S compare to similarly priced pressure washers.

  • With 3200 PSI, the Simpson MSH3125-S ranks as one that can reach an above average pressure, amongst the gas-powered products that cost between $300 and $400. If your priority is the highest possible power of the water stream, in this price range, we suggest checking out the Stanley SXPW3425, which reaches up to 3400 PSI.
  • Considering its water flow, this washer, with a GPM (gallons per minute) of 2.5 is in the average compared to other devices in its price range. If maximum rinsing efficiency is your top priority, one of the devices with the highest water flow in the same price range is the Lifan LFQ3370, with a GPM of 3.
  • The 8000 Cleaning Units (PSI x GPM), of the MSH3125-S sit at an average, in reference to other gas-powered units of similar price. In case you are looking for the highest overall cleaning power, in this price range, one of the current champions is the Lifan LFQ3370 and its 9900 Cleaning Units.
According to our stats, the following comparison is pretty popular: Simpson MSH3125-S vs Generac 7019.

Price comparison

As you can see from this interactive chart, when compared to other gas-powered washers between 8000 and 8500 Cleaning Units, the Simpson MSH3125-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
  • Honda engine
  • Designed to be stable
  • Good range of nozzles included
  • Automatic detergent dilution
  • Onboard storage
  • Several security features
  • CARB-compliant
  • 5 year (limited) warranty
  • High PSI for the price
AVERAGE SPECS:
  • Decent GPM for the price
  • Decent CU for the price
WEAKNESSES:
  • No soap tank

Do you own the Simpson MSH3125-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
PSI3200
GPM2.5
Cleaning Units8000
Engine187 cc 6 HP Honda GC190 4-stroke OHC
PumpAxial Cam
SeriesMegaShot
Other model numbers60551
Features
FrameWelded steel
Soap injectionVia siphon hose
Soap dilution7:1
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose25 ft, ⌀1/4
Hose storageHooks
Misc
Dimensions
(D x W x H)
Approx. 34 x 21 x 24 in
Weight55 lbs
Wheels2 wheels, ⌀10", pneumatic
Included accessoriesOil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles
SecurityTrigger lock and thermal relief valve
EmissionsCARB, EPA
Warranty5 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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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 MSH3125-S is covered under a warranty for up to 5 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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