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)
Zoom on the Simpson MSH3125-S
The Simpson MSH3125-S is a heavy duty, commercial pressure washer, that provides its users with an all-around versatile cleaning experience, and enables:
- spot cleaning of hard, unpainted surfaces and high-reach cleaning
- intense cleaning of hard, unpainted surfaces
- cleaning of painted and frail surfaces
- use of detergent and cleaning solutions
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.
This gas-powered pressure washer’s Honda GC190 engine is started by a traditional pull-start mechanism.
The fuel is stored in a tank, which can hold up to 0.48 gallon of gasoline.
Design & Handling
The wheelbarrow design of the Simpson MSH3125-S grants mobility and stability to the unit. The strong welded steel frame assures assembly longevity. The handle adds to the MSH3125-S convenience of transport.
Weighing 55 lbs, the unit is easy to maneuver by most people. One of the largest contributors to its weight are its 187 cc Honda GC190 engine and its welded steel frame. Since the MSH3125-S has a set of two 10" pneumatic wheels, it is still easily maneuvered and manipulated.
The Simpson MSH3125-S comes with a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, which are detailed below.
- Soap injection: While the device doesn't feature a soap tank, detergent supply is ensured by a siphon hose. The Simpson MSH3125-S has an automatic soap dilution mechanism, which dilutes the detergent using a 7:1 ratio. The detergent will be added automatically to the water when a soap nozzle is attached.
- 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.
|Concrete, brick, masonry||Use with caution||Suitable||Suitable||Suitable||Suitable|
|Siding, gutters, house||Not recommended||Use with caution||Use with caution||Suitable||Suitable|
|Fencing, deck, patio||Not recommended||Use with caution||Use with caution||Suitable||Suitable|
|Lawn equipment, boat, RV||Not recommended||Use with caution||Use with caution||Use with caution||Suitable|
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.
- Onboard storage: With the Simpson MSH3125-S's handy storage area, you’ll always have all the necessary nozzles and accessories at hand and thus, you’ll be fully prepared for any job.
- Safety: Safety of operation is enhanced by a trigger lock mechanism (which prevents accidental operation) and a thermal relief valve (which helps to prevent internal pump damage).
- Accessories: The Simpson MSH3125-S comes with an owner's manual (opens in a new tab) and some basic documentation to get you quickly started. On top of that, you also get spray gun, soap hose, pressure hose, oil and wand.
- Emissions: The Simpson MSH3125-S is EPA-approved and CARB-compliant. Thus, selling and purchasing this pressure washer is allowed in each of the 50 states, including California.
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.
- The Simpson MSH3125-S, reaching a PSI of up to 3200, is one of the more powerful gas-powered units in $300-400 price range. 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.
- The water flow of this washer, which reaches up to 2.5 GPM (gallons per minute) is one of the higher values found in the above-mentioned price range. If rinsing away debris most efficiently is your priority, one of the devices with the highest GPM in this price range is the Predator 3100, which can reach up to 2.8 GPM.
- With a rather impressive value of 8000 Cleaning Units (PSI x GPM), the MSH3125-S has a higher cleaning efficiency compared to similarly priced devices. When it comes to the highest overall cleaning power in the current price range, one of the products at the very top currently is the Briggs & Stratton 20505 and its 9520 Cleaning Units.
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.
Features and Specifications
|Engine||187 cc 6 HP Honda GC190 4-stroke OHC|
|Other model numbers||60551|
|Soap injection||Via siphon hose|
|Nozzles||0°, 15°, 25°, 40°, Soap|
|Quick connect nozzles||Yes|
|Hose||25 ft, ⌀1/4|
(D x W x H)
|Approx. 34 x 21 x 24 in|
|Wheels||2 wheels, ⌀10", pneumatic|
|Included accessories||Oil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles|
|Security||Trigger lock and thermal relief valve|
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.
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.
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.