Simpson Clean Machine 3400 PSI
#11 in GasFull review
A compact, ready to run washer for homeowners who want 3400 PSI without a pro price. The short pump warranty is the trade off.
Amazon $359$359
The Simpson Clean Machine 3400 PSI is the better pressure washer overall, rated 3.2 to 2.7. The Simpson Clean Machine 3400 PSI leads on value. The Simpson Aluminum 3400 PSI wins on warranty. The Simpson Clean Machine 3400 PSI costs $473.90 less ($359 vs $832.90).
Simpson Aluminum 3400 PSI
#19 in GasFull review
For contractors who want a CAT pump and a rustproof frame on a light 2.5 GPM machine. Homeowners get the same cleaning power for far less elsewhere.
Amazon $832.90$832.90
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Simpson Clean Machine 3400 PSI for value ($42.24 per 1,000 cleaning units ($359, 8,500) vs $97.99 per 1,000 cleaning units ($832.90, 8,500)).
- Choose the Simpson Aluminum 3400 PSI for warranty (3-year warranty vs 1-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gas pressure washer; a clear win is highlighted. How we rank explains each one.
| Factor weight | Simpson Clean Machine 3400 PSI | Simpson Aluminum 3400 PSI |
|---|---|---|
| Overall rating | 3.2/5 | 2.7/5 |
| Value 35% | 80 $42.24 per 1,000 cleaning units ($359, 8,500) | 0 $97.99 per 1,000 cleaning units ($832.90, 8,500) |
| Cleaning power 30% | 58 8,500 cleaning units (3,400 PSI x 2.5 GPM) | 58 8,500 cleaning units (3,400 PSI x 2.5 GPM) |
| Hose 10% | 33 25 ft hose | 33 25 ft hose |
| Warranty 25% | 0 1-year warranty | 50 3-year warranty |
Specifications
| Simpson Clean Machine 3400 PSI | Simpson Aluminum 3400 PSI | |
|---|---|---|
| Cleaning | ||
| Pressure | 3,400 PSI | 3,400 PSI |
| Flow | 2.5 GPM | 2.5 GPM |
| Cleaning units | 8,500 | 8,500 |
| Nozzles included | 4 | 5 |
| Power | ||
| Power | Gas | Gas |
| Engine or motor | 208 cc (CRX 210) | 196 cc (Honda GX200) |
| Pump | Axial cam | Triplex plunger |
| CARB compliant | No | No |
| Build | ||
| Hose | 25 ft | 25 ft |
| Weight | 64 lb | 81 lb |
| Warranty | 1 year | 3 years |