SIMPSON 3600 PSI Gas Pressure Washer, 2.5 GPM Commercial Power Washer, Cold Water, Honda GX200 Engine, 35' Hose, Aluminum Series…
Best for
Best triplex pump
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 2 trusted sources
Current price
$729.99
Updated May 16, 2026 · 1 min read
Sources behind this verdict
10 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, the Simpson ALH3425 is the pick when pump quality matters most. Home Depot verified-purchase reviewers specifically call out the Honda GX200 engine and CAT pump as 'powerful and reliable,' and Lowe's reviewers report the GX engine 'starts effortlessly.' A high-trust r/HomeImprovement commenter confirms it 'works fine for washing the siding, the deck, and the car' while noting it won't strip a deck on its own. The caveats come mostly from specialist communities and Amazon's 4.1/5 average.
What reviewers liked
- Honda GX200 commercial-grade engine plus AAA/CAT triplex pump is the most rebuildable platform in the pool
- High-trust r/HomeImprovement commenter confirms real-world residential performance
- Verified-purchase reviewers at Home Depot, Lowe's, and Tractor Supply consistently praise build quality
- 35-foot hose and aluminum frame are upgrades over the standard PowerShot models
Where it falls short
- 4.1/5 Amazon average across 530 reviews is the lowest of our top picks
- r/pressurewashing users point out the same engine and pump appear on cheaper Simpson SKUs
- High-trust r/Tools thread notes industry-wide PSI inflation — true output likely below the 3,600 label
- Heavier and pricier than 3,000–3,400 PSI alternatives that handle most homeowner tasks
Across the reviewers we read, the Simpson ALH3425 is the pick when pump quality matters most. Home Depot verified-purchase reviewers specifically call out the Honda GX200 engine and CAT pump as 'powerful and reliable,' and Lowe's reviewers report the GX engine 'starts effortlessly.' A high-trust r/HomeImprovement commenter confirms it 'works fine for washing the siding, the deck, and the car' while noting it won't strip a deck on its own.
The caveats come mostly from specialist communities and Amazon's 4.1/5 average. r/pressurewashing threads compare it directly to the PS61368 variant and note the engines and pumps are the same — meaning the premium here is for the aluminum frame and longer 35-foot hose rather than a true performance jump. A high-trust r/Tools post separately warns that pressure-washer PSI specs across the industry are often inflated, so the '3,600 PSI' label should be read with that in mind. For a buyer who specifically wants a rebuildable triplex pump backed by a true Honda engine, the trust-weighted consensus is solidly positive.
- Simpson Pressure Washer For Professionals
- The Simpson Aluminum Series gas power washer cleans decks, driveways, siding, fencing, equipment, and graffiti; The cold water machine is great for contractors; 49-State Compliant (Not for sale in California)
- Engine & Pump
- HONDA GX200 engine starts easily & includes low-oil shutdown; 3600 PSI 2.5 GPM AAA triplex plunger pump features integrated unloader; Thermal relief prevents overheating; PowerBoost Technology delivers higher pressure at the nozzle
- Long Hose Reach
- The Simpson Morflex series 35' high-pressure hose is non-marring, flexible and abrasion-resistant; Pump/Hose Connection: Threaded M22 connection
- Easy Mobility
- 10" premium pneumatic tires roll smoothly over gravel, grass, and curbs; Balanced layout improves transport; Aircraft grade aluminum frame with powder-coated finish is easy to assemble and resists corrosion; 21" L x 24" W x 34" H; 78 lb.
- Pro Pressure Washer Accessories
- Five quick-connect pressure washer tips (0°, 15°, 25°, 40°, and soap nozzle) cover tasks from stripping paint to car cleaning; Professional QC spray gun with safety lock-out and 16" spray wand included
I can't decide if the better pump is worth the extra money and i lose 2000 psi. What do yall think? 1st one is 799.00 3400 PSI better pump.
So I bought that 4gpm simpson from home depot. Pump started smoking after about 5 min of use. Returned it and found a pressure washing store ...
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“Simpson 3600 Powerwasher Review May 2018” · YouTube
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