PowerSmart DL1038A
#7 in GasFull review
A low cost gas washer with a long hose for homeowners who clean a few times a year. Judge it as a 3000 PSI machine, not the 3800 PSI in the title.
Amazon $269.99$269.99
3.4/5
For pressure washing businesses that want a CAT pump and a rustproof frame at full 4 GPM flow. The steel frame PS4240 does the same work for less.
- 4,200 PSIPressure
- 4 GPMFlow
- 50 ftHose
- 3 yearsWarranty
Check price at Amazon$1,397
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 4.0 GPM at 4200 PSI for fast work on large concrete and siding jobs
- CAT triplex pump and Honda GX390 are a long lasting professional pairing
- Aluminum frame will not rust on a trailer
Cons
- The most expensive washer here
- Over 130 lb, so it needs a ramp or two people
The Simpson Aluminum ALH family
Every Simpson Aluminum ALH model we rank, smallest first. Ratings compare each against its own power source.
| Model | Pressure | Rating | Price |
|---|---|---|---|
| Simpson Aluminum 3400 PSI | 3,400 PSI | 2.7/5 | $832.90 |
| Simpson Aluminum 3600 PSI | 3,600 PSI | 3.2/5 | $701.99 |
| Simpson Aluminum 4200 PSI (this one) | 4,200 PSI | 3.4/5 | $1,397 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its power source. How we rank explains each one.
Specifications
| Model number | ALH4240-S |
|---|---|
| Cleaning | |
| Pressure | 4,200 PSI |
| Flow | 4 GPM |
| Cleaning units | 16,800 |
| Nozzles included | 5 |
| Power | |
| Power | Gas |
| Engine or motor | 389 cc (Honda GX390) |
| Pump | Triplex plunger |
| CARB compliant | No |
| Build | |
| Hose | 50 ft |
| Weight | 133 lb |
| Warranty | 3 years |
Alternatives in this power source
Simpson PowerShot 4200 PSI
#8 in GasFull review
For pressure washing businesses and farms that run a washer for hours at a time. Homeowners get far better value from a 3,000 to 3,600 PSI model.
Amazon $1,199.04$1,199.04
Westinghouse WPX3000
#10 in GasFull review
A light, low cost washer for homeowners with occasional deck and car jobs. Buyers who use soap often should look at the WPX3400 with its built-in tank.
Amazon $299$299
Compare
Compare the Simpson Aluminum 4200 PSI with any other pressure washer →
More from Simpson: every Simpson product ranked.