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Simpson MSH3125-S MegaShot Review

By: Carl Laron on March 21, 2017

Bottom Line

For those with tough household cleaning jobs, the Simpson MSH3125-S MegaShot is a standout choice. Driven by a high-quality Honda engine, this pressure washer is more than powerful enough to tackle any residential task, including stripping paint.


  • Standout performance
  • Honda engine
  • High quality hose
  • Carb compliant


  • No onboard detergent tank
  • Not the best customer service
Our Analysis
Read Amazon Reviews

Breaking it down


Powerful sprayer hits hard and fast. While some pressure washers have more impressive ratings, in real world use, the Simpson MSH3125-S stands shoulder-to-shoulder with the best of them when it comes to powerful cleaning ability. Users report good performance on decks, boats, walkways, cars and siding, as well as mold and mildew stains. It can also strip paint, though care should be taken not to damage underlying surfaces. Driven by a well-regarded Honda engine, durability is excellent, and Brian Teitelbaum at PressureWashersDirect.com reports that among the models that this retailer carries, the Simpson has been by far the most reliable and durable pressure washer in this category." That might be a very good thing, as YourBestDigs.com reports that customer service could have been a little more caring when it contacted them with an issue regarding its test unit. The Honda motor is covered for two years, the frame and pump for one year, and the spray accessories for 90 days.


What you need, but not much more. The Simpson MSH3125-S MegaShot pressure washer is supplied with five quick connect nozzles -- zero, 15, 25 and 40 degrees, plus soap applicator -- to handle any cleaning task. The MorFlex hose is kink and abrasion resistant, and TheFamilyHandyman.com notes that it "is very flexible and includes double O-rings for a better seal." One downside is that there are no on-board detergent tanks, but there is a detergent injection system and syphon hose included, which can be dropped into a container of detergent. The Simpson pressure washer is CARB compliant so that it can be sold in all 50 states.  

Ease of use

A breeze to handle and maneuver. Although it weighs around 74 pounds, the Simpson MSH3125-S MegaShot is easy to maneuver. TheFamilyHandyman.com says 10-inch pneumatic tires "give the smoothest ride of all the machines" it tested. It also says that the Simpson paced the field when it came to set up. Users largely report that the machine is exceptionally easy starting -- something that can't be said of all gas pressure washers. The quick connect nozzles follow an industry standard and are easy to change out. If there's a red flag, it's that we spotted some user complaints that Simpson's customer service is not always eager to please, and, as noted above, that's echoed in the expert review at YourBestDigs.com. Still, most users give good grades to the Simpson MSH3125-S, which rates better than the norm among gas-powered pressure washers.

Our Sources

Editors of TheFamilyHandyman.com, Not Dated

TheFamilyHandyman.com names the Simpson MSH3125-S an Editors' Choice selection as one of the Best Overall gas pressure washers. Discussion isn't terribly detailed, but the editors love the machine's performance, ease of set up, and smooth ride.

Editors of YourBestDigs.com, Dec. 16, 2016

The Simpson is a runner up here, primarily on an issue that cleared up on its own after some indifferent customer support from the maker. That aside, the pressure washer performed well, with enough "real-world" cleaning power to take paint off of wood and clean everything from outdoor furniture to concrete floors.

Brian Teitelbaum and contributors to PressureWashersDirect.com, As of March 2017

Product expert Brian Teitelbaum recommends the Simpson MSH3125-S, praising its quiet operation, easy starting and overall reliability. A good number of users (more than 275) have weighed in with their own take -- and most give it a thumbs-up; 88 percent say that they would recommend this power washer to a friend.

Contributors to Amazon.com, As of March 2017

We found roughly 880 unique user reviews at Amazon.com. Once again this Simpson pressure washer scores highly with a rating of 4.4 stars overall. Reviews here are all unique to Amazon.com.

Contributors to HomeDepot.com, As of March 2017

We spotted more than 780 additional reviews of this Simpson pressure washer at HomeDepot.com, though some were originally posted at the manufacturer's web site. It earns a score of 4.4 stars, and is recommended by 92 percent of owners.

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