Free Shipping and BOPIS


Model # MSH3125-S

Internet # 203177499

Honda GC190 MegaShot 3100-PSI 2.5-GPM Gas Pressure Washer

This item has been discontinued.
The Home Depot no longer carries this specific product.

$399.00 /each

  • HONDA GC190 OHC premium Engine
  • Maintenance-free OEM Technologies
  • Pro-style steel spray wand with 5 quick connect nozzle tips




Model # MSH3125-S

Internet # 203177499

Especially created for the home and shop, the Simpson MegaShot series is perfect for the "Do-it-Yourselfer" looking for maximum performance with minimal investment. Simple to use and great for cleaning decks, patios, house siding, outdoor furniture, and prepping home exteriors for painting. Its compact design is lightweight and small enough to be easily transported by one person. Equipped with premium Honda OHC Engines that are built with high-quality components, designed for optimum performance in the harshest environments, and renowned for being easy to start, consistently. OEM Technologies axial cam pumps with patent pending PowerBoost technology provide higher pressure at the nozzle resulting in greater impact and cleaning performance.

California residents: see  Proposition 65 information

  • Honda GC190 OHC premium residential - Engine oil is included
  • Maintenance-free OEM Technologies axial cam brass head pump with PowerBoost technology which provides higher pressure at the nozzle
  • Welded frame construction and 10 in. premium pneumatic tires
  • 1/4 in. x 25 ft. MorFlex high pressure hose is kink and abrasion resistant, provides flexibility, and is equipped with easy twist-on connectors
  • Pro-style steel spray wand with 5 quick connect nozzle tips- 0 degrees, 15 degrees, 25 degrees, 40 degrees, and soap applicator nozzle
  • Downstream detergent injection system for use of cleaners
  • Ergonomic spray gun with safety lock-out
  • Convenient on-board a ccessory storage for spray gun/wand, high pressure hose, and nozzles
  • Home Depot Protection Plan:

    Home Depot Protection Plan

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.


Assembled Depth (in.) 
34.75 in 
Assembled Height (in.) 
23.25 in 
Assembled Width (in.) 
21 in 
Hose Diameter (In.) 
.25 in 
Hose length (in.) 
CA (CARB) Compliant 
CARB Compliant 
Detergent tank 
Engine Displacement (cc) 
Engine Make 
Engine Type 
GC190 OHC 
Foldable handle 
Fuel tank capacity (gallons) 
Hose Material 
Maximum Pressure (PSI) 
Number of tips included 
Onboard storage 
PSI Range 
2600-3199 PSI 
Pressure Washer Power Type 
Product Weight (lb.) 
60 lb 
Pump Brand 
Pump Type 
Start Type 
Translucent fuel tank 
Water capability 
Warranty / Certifications
Manufacturer Warranty 
Limited Warranty – Consumer Use - 2 Years on HONDA GC engine, 1 Year on frame and pump components, 90 Days on spray accessory items 


Rated 4.4 out of 5 by 427 reviewers.
Rated 5.0 out of 5.0 by Good deal for the whole family to use Easy start and works great. My two teenage daughters have been using it this summer for projects since my old washer broke. Easy enough for two teens to operate safely. Only problem I have had is the pressure tips vibrate out of the holding spots located on the handle. I actually lost one already because it popped out while I was using another in the wand. Now I just keep them in my pocket while i'm running the machine. Soap/cleaner injector works fine with the low pressure tip. Runs about an hour on a tank of gas because the tank is pretty small but stopping every hour is good for a water break anyway. July 16, 2015
Rated 5.0 out of 5.0 by Power to spare and easy to use When I looked for power washers I was thinking about getting one that would be "future proof" meaning I would have enough power to do ANY (normal) household job while it being nimble enough for my wife to use should she want to. I looked at many electric and gas powered pressure washers and ended up buying this one due to is having a Honda motor and the great power and throughput measurements. So far I have used the pressure washer for about 10 hours. I washed my pool deck, my driveway and my walkway. It starts very easily and has enough power to do any job that I can imagine. My wife enjoys using it, so much so when she washed off the pool deck this weekend she pulled the washer out to use it and got the job done very quickly. One warning is that this has a LOT of power and when coupled with the nozzle that has the most concentrated beam is powerful enough to do damage to concrete and other porous surfaces. I made a nice dent in my concrete where I started using it. Overall I am glad I spent the extra $100 and went for a gas driven powerhouse. Since it is on wheels it is actually easier to move around that some of the electric ones I have used that are not on wheels. While I would not want to try to move this power washer in the cab of my car, given the size and weight, this is not something I would be very likely to do anyway. April 28, 2015
Rated 4.0 out of 5.0 by So Far So Good Very much pressure......Explained to my wife the danger of high pressure washing. "That's great" she said.......Ten minutes later, I find her successfully stripping the pen lines off of her car......smh August 25, 2015
Rated 4.0 out of 5.0 by Power Plus I have been using home style electric pressure washers for years but felt it time to move up to a gas powered one. This one delivers the power. So much so that cleaning smaller items can be a challenge. Pros: 1) has lots of pressure 2) has several quick connect nozzles 3) has reliable metal connectors 4) the wand is sturdy and a nice length 5) engine starts easily Cons: 1) the handle and clearance under it do not allow good movement 2) the wand rest is stupid at best 3) the nozzles will jump out of their holder during operation 4) the hose holder drops from the handle that is already too close to the ground so short loops are required for storage making the hose hard to secure Bottom Line: This unit with the separate nozzles will take care of most big jobs and clean well; however, the amenities leave something to be desired. I added a strap to cover the nozzles in their holder to keep them there, bought quick connectors for the high pressure hose, added a rest on the frame for the wand under the muffler, and bent over the first wand rest on the handle and only use the second. I also added a strap to secure the upper part of the wand (still needs some work) for storage. I think a windup drum for the high pressure hose would be a nice addition and a regulator to reduce the pressure would be nice too but the price was right and I hope to get years of use from this one. July 4, 2015
Rated 5.0 out of 5.0 by Fantastic!!! I have used more than one 2700 psi washer over several years, but this Simpson 3100 psi was significantly stronger. It worked twice as fast as my older (I wore it out) washer. So much pressure, I had to hold on to the wand with both hands!!! It really did speed up my jobs. Well worth the price. It will help me make more money quicker with more client satisfaction because it does such a good cleaning job so quickly. I bought it because of the Honda GC 190 and it has not disappointed me. October 21, 2014
Rated 5.0 out of 5.0 by Excellent machinery. The unit MSH3125-S arrived in a short period of time from the online order and packaging prevented any damage. Once I understood the manual and put it together correctly with use I realized I had an excellent machine for the dollars spent. There is always more suggestive information the manufacturer can add to the manual; too much emphasis is given to the Spanish instructions like 1/2 English and 1/2 Spanish. If we comprehend English give us a more complete English manual, and if Spanish do likewise. November 6, 2015
Rated 5.0 out of 5.0 by Great machine I wanted to invest in a good pressure washer, so I did a lot of research and it lead me to this Simpson machine. Reviews were great. Unit arrived in good condition with oil included. I only had to setup the handle and fill it with oil. Washer ran great for couple hours and had amazing pressure. Comments about the nozzle holder is true, they Keep falling off and it's annoying to have to pick them up after. That doesn't take away from how great the machine is. November 10, 2015
Rated 5.0 out of 5.0 by Excellent performance and value I purchased my washer several months ago and would recommend it to anyone. It starts easily, is simple to use and performs flawlessly. November 16, 2015
  • 2015-11-28 T12:28:16.487-06:00
  • bvseo_lps, prod_bvrr, vn_prr_5.6
  • cp-1, bvpage1
  • co_hasreviews, tv_427, tr_427
  • loc_en_US, sid_203177499, prod, sort_default
2 3 4 5  ... 15 >>