Simpson PowerShot 4000 PSI
#4 in GasFull review
A contractor grade washer for people who clean large areas often. Its flow and hose make big jobs much quicker than a homeowner unit.
Amazon $829.94$829.94
The Simpson PowerShot 4000 PSI is the better pressure washer overall, rated 3.9 to 3.8. The Simpson PowerShot 4000 PSI leads on cleaning power. The Westinghouse WPX3600 wins on value. The Westinghouse WPX3600 costs $300.94 less ($529 vs $829.94).
Westinghouse WPX3600
#6 in GasFull review
For homeowners who want a longer lasting triplex pump and longer hose without paying Honda engine prices.
Amazon $529$529
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 PowerShot 4000 PSI for cleaning power (14,000 cleaning units (4,000 PSI x 3.5 GPM) vs 9,720 cleaning units (3,600 PSI x 2.7 GPM)).
- Choose the Westinghouse WPX3600 for value ($54.42 per 1,000 cleaning units ($529, 9,720) vs $59.28 per 1,000 cleaning units ($829.94, 14,000)).
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 PowerShot 4000 PSI | Westinghouse WPX3600 |
|---|---|---|
| Overall rating | 3.9/5 | 3.8/5 |
| Value 35% | 44 $59.28 per 1,000 cleaning units ($829.94, 14,000) | 53 $54.42 per 1,000 cleaning units ($529, 9,720) |
| Cleaning power 30% | 100 14,000 cleaning units (4,000 PSI x 3.5 GPM) | 79 9,720 cleaning units (3,600 PSI x 2.7 GPM) |
| Hose 10% | 100 50 ft hose | 100 35 ft hose |
| Warranty 25% | 50 3-year warranty | 50 3-year warranty |
Specifications
| Simpson PowerShot 4000 PSI | Westinghouse WPX3600 | |
|---|---|---|
| Cleaning | ||
| Pressure | 4,000 PSI | 3,600 PSI |
| Flow | 3.5 GPM | 2.7 GPM |
| Cleaning units | 14,000 | 9,720 |
| Nozzles included | 5 | 5 |
| Detergent | - | Onboard tank |
| Power | ||
| Power | Gas | Gas |
| Engine or motor | 270 cc (Honda GX270) | 212 cc (Westinghouse OHV) |
| Pump | Triplex plunger | Triplex plunger |
| CARB compliant | No | No |
| Build | ||
| Hose | 50 ft | 35 ft |
| Weight | 120 lb | 79 lb |
| Warranty | 3 years | 3 years |