The Simpson MSH3125-S MegaShot is one of the best-selling gas-powered pressure washers in the U.S. Built for homeowners who want commercial-grade cleaning power at an affordable price, it delivers 3200 PSI and 2.5 GPM with a reliable Honda GC190 engine. But does it live up to the hype? In this detailed review, we’ll cover its features, performance, pros and cons, and how it compares to other top models.
Quick Verdict
The Simpson MSH3125-S offers professional-level cleaning performance for residential users at a budget-friendly price. It’s powerful enough for driveways, siding, decks, and heavy dirt, while still being compact and easy to use. If you want gas power without spending $800+, this is one of the best options available.
Key Features – Simpson MSH3125-S
- Pressure: 3200 PSI
- Flow Rate: 2.5 GPM
- Engine: Honda GC190 premium residential engine
- Pump: OEM Technologies axial cam pump (maintenance-free)
- Nozzles: 5 quick-connect tips (0°, 15°, 25°, 40°, soap)
- Frame: Welded steel frame with 10” pneumatic tires
- Hose: 25-foot MorFlex high-pressure hose (non-marring, kink resistant)
- Weight: 65 lbs
Who Is It For?
The Simpson MSH3125-S is designed for homeowners and DIYers who want serious cleaning power without the cost of a full commercial washer. It’s perfect for:
- Driveways, sidewalks, and patios
- House siding and fences
- Deck and paint prep
- Heavy outdoor furniture and equipment
- Car and truck cleaning (with wide-angle nozzle)
Performance Review
At 3200 PSI and 2.5 GPM, this washer easily blasts away dirt, mildew, oil stains, and peeling paint. The Honda GC190 engine starts consistently and runs smoothly, while the axial cam pump provides strong performance without requiring maintenance. Compared to electric washers (usually 2000 PSI max), the MegaShot finishes jobs in half the time.
Pros and Cons
Pros:
- Honda GC190 engine — reliable and easy to start
- Strong 3200 PSI cleaning power
- Maintenance-free pump
- Compact frame with pneumatic tires for portability
- Excellent value under $500
Cons:
- Louder than electric models
- No onboard detergent tank (uses siphon hose instead)
- Axial pump (not rebuildable like triplex pumps)
Simpson MSH3125-S vs Competitors
| Model | PSI / GPM | Engine | Pump | Price |
|---|---|---|---|---|
| Simpson MSH3125-S | 3200 / 2.5 | Honda GC190 | Axial cam | Check Price |
| Westinghouse WPX3200 | 3200 / 2.5 | Westinghouse OHV | Axial cam | Check Price |
| Generac SpeedWash 6882 | 3200 / 2.7 | Generac OHV | Axial cam | Check Price |
| Simpson PowerShot PS3228 | 3300 / 2.5 | Honda GX200 | Triplex pump | Check Price |
Ease of Use
The MegaShot is easy to set up and operate. Assembly takes less than 15 minutes, and the Honda engine typically starts on the first or second pull. The compact steel frame and 10-inch pneumatic wheels make it portable, though at 65 lbs it’s heavier than most electrics. Noise is typical for gas washers — expect around 85 dB while running.
Best Accessories for the Simpson MSH3125-S
- 15″ PowerFit Surface Cleaner – Cuts driveway cleaning time in half.
- Foam Cannon Kit – Great for car and truck washing.
- Turbo Nozzle – Extra power for tough stains and concrete.
- 50-Foot MorFlex Hose – Upgrade for longer reach.
Frequently Asked Questions
1. Is the Simpson MSH3125-S good for cars?
Yes, but use the 40° nozzle to avoid damaging paint. For best results, pair with a foam cannon.
2. How long will it last?
With proper care, the Honda GC190 engine and axial pump should last 5–7 years of residential use.
3. Can it be used commercially?
It’s built for residential use. For daily commercial work, a triplex pump model like the Simpson PowerShot PS3228 is better.
4. Does it have a soap tank?
No. It uses a siphon hose to draw detergent from a separate container.
5. Is it worth the money?
Yes — it’s one of the best gas washers under $500, offering exceptional performance for homeowners.
Final Verdict – Should You Buy the Simpson MSH3125-S?
The Simpson MSH3125-S MegaShot is an excellent gas pressure washer for homeowners who want serious cleaning power without breaking the bank. It’s strong enough for tough jobs like driveways and siding, reliable thanks to the Honda engine, and easy to maintain. While it’s not designed for heavy commercial use, it’s one of the best residential gas pressure washers available today.