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
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 tough, paintless surfaces
- cleaning of painted and frail surfaces
- application of detergent and cleaning solutions
With a 187 cc (6 hp) engine, its axial cam pump delivers a pressure of 3200 PSI (roughly 53 times more than a standard garden hose) and a flow of up to 2.5 GPM (CETA-certified values), resulting in the Simpson MSH3125-S's 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. The robust welded steel frame guarantees longevity of the assembly. The handle adds to the MSH3125-S convenience of transport.
The majority of users will be able to maneuver this unit easily, it only weighs 55 lbs. Its 187 cc Honda GC190 engine and welded steel frame all add up to a substantial part of that weight. Nethertheless, thanks to its two 10" pneumatic wheels, the MSH3125-S remains very easy to manipulate and maneuver.
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: Detergent is fed in through a siphon hose, since the device lacks a soap tank. 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 enables you to easily store the included classic ergonomic spray gun and its steel wand.
- Nozzles: The table below shows you the 5 included nozzles, as well as the surfaces they're the most appropriate for.
|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: The Simpson MSH3125-S's handy storage area lets you store nozzles and accessories, and thus, you’ll be always prepared and have everything necessary for the job at hand.
- 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: 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 pressure hose, wand, spray gun, oil and soap 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.
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, with a max water pressure of 3200 PSI, has one of the higher PSI values of the gas-powered products in the $300-400 price range. In case you are looking for a device with the highest possible power of its water stream, one of the top achievers in this price range is the Westinghouse WPX3400 with a PSI of 3400.
- In the aforementioned price range, the GPM (gallons per minute) of this washer, which can reach 2.5, can be considered in the average. If maximum rinsing efficiency is your top priority, one of the devices with the highest water flow in the same price range is the Predator 3100, with a GPM of 2.8.
- 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. If you are after the highest overall cleaning power, the Predator 3200 with its 8960 Cleaning Units is one of the products that can achieve the highest cleaning efficiency in this price range.
Here's a list of the most popular specific comparisons:
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 cheap side of the price range.
It can therefore be a really good buy if you're looking to acquire a budget pressure washer.
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.