Search  for anything...
SIMPSON

Simpson 3600 PSI Gas Pressure Washer, 2.5 GPM Commercial Power Washer, Cold Water, Honda GX200 Engine, 35' Hose, Aluminum Series, 49-State Compliant (ALH3425)

  • Based on 1,520 reviews
Condition: New
Checking for the best price...
$1,149.99 Why this price?

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

Availability: Only 9 left in stock, order soon!
Fulfilled by Sparks_Fly
Arrives Wednesday, May 27
Order within 4 hours and 59 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Style: 3600 PSI


Features

  • 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

Description

Built for pros, the SIMPSON Aluminum Series ALH3425 delivers 3,600 PSI at 2.5 GPM for fast, deep cleaning. Honda’s GX200 commercial engine teams with a maintenance-free AAA industrial triplex pump with PowerBoost for higher pressure at the nozzle. The aircraft-grade aluminum frame with brushed, extruded tubing resists corrosion and cuts weight, while 10" pneumatic tires roll easily over jobsite terrain. Includes a 35-ft MorFlex 5/16" high-pressure hose (non-marring, kink and abrasion resistant), ergonomic professional spray gun with safety lock-out, 16" steel wand, and 5 quick-connect nozzles (0°, 15°, 25°, 40°, soap). Threaded M22 connections speed setup; thermal relief helps prevent overheating. 49-state compliant and easy to start, this cold- water gas power washer is ideal for contractors handling deck cleaning, wood restoration, paint prep, equipment and concrete.

Brand: SIMPSON


Power Source: Gas Powered


Color: Black & Red


Item Weight: 35.83 Kilograms


Hose Length: 25 Feet


Specification Met: CARB, 49-State Compliant


Product Dimensions: 30"L x 24"W x 21"H


Tank Volume: 2.5 Gallons


Maximum Flow Rate: 2.5 Gallons Per Minute


Global Trade Identification Number: 52


Item Weight: 35.83 Kilograms


Hose Length: 25 Feet


Item Dimensions L x W x H: 30"L x 24"W x 21"H


Tank Volume: 2.5 Gallons


Power Source: Gas Powered


Maximum Flow Rate: 2.5 Gallons Per Minute


Maximum Pressure: 3400 Pound per Square Inch


Specification Met: CARB, 49-State Compliant


Color: Black & Red


Brand Name: SIMPSON


Model Number: ALH3425


Global Trade Identification Number: 52


UPC: 879399001826 879399001352


Manufacturer Warranty Description: 3 year engine, 5 year pump, 10 year frame


Manufacturer Part Number: 60689


Included Components: SIMPSON Cleaning ALH3425 Aluminum Gas Pressure Washer


Unit Count: 1.0 Count


Item Type Name: Gas Pressure Washer, 2.5 GPM Commercial Power Washer, Cold Water, Honda GX200 Engine, 35' Hose, Aluminum Series, 49-State Compliant (ALH3425)


Manufacturer: Simpson Cleaning


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, May 27

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Love this pressure washer!
Style: 3600 PSI
Easy assembly, nice fit and finish particularly the aluminum frame. Honda engine is awesome and started on the first pull. Plenty of power to pressure wash deeply for driveways, etc.
Reviewed in the United States on March 25, 2026 by Tim W
    • Simpson 3600 psi power washer
Style: 3600 PSI
Works as expected. Very powerful and engine started on first pull.
Reviewed in the United States on March 27, 2026 by LD
    • would not run :(
Style: 3600 PSI
Purchased this machine because it had the Honda GX engine & because it was made in the USA! Have several other Honda powered pieces of equipment that have been reliable, easy start and trouble free. However, this SIMPSON power washer would not start I should say, after about 5 tries it did start several times but then immediately died Took me repeated tries (nearly an hour) with waiting, in case it was flooded, between tries. Once I did finally get it started I could not adjust the choke or throttle, as suggested in the manual, without the machine dying . The machine only ran for a few minutes before it began backfiring. It would only run without backfiring if the water wand was kept in the washing position at all times. I could not take my hand off the wand handle or the machine would backfire. After calling the help line their only suggestion was for me to take this brand new machine into the repair shop. It was Saturday, mid day by this time, and the repair shop did not have a repair person available to help so would have to leave it for them to look at in a few days or so. Out of frustration I tried to go ahead and continue using it and kept the power wand in the open-wash position but gradually the machine started backfiring anyway. I turned it off and let it rest thinking maybe it was hot (my previous power washer - 15 years old - would run and run until out of gas, then I would let it rest and cool before re-filling the gas tank.) After turning it off, I was not able to restart it again. I had hired a couple young men to come help me move items, power wash under & behind, then return the items to their proper place. Many of the things had already been moved. I Needed to get power washing under and behind before returning them to their place. I had already been paying for them to stand around while trying to get the machine started then trouble shoot on the phone. I had to go buy a Costco power washer so I could get the work done while I had helpers!!! Now the company whom sent this is saying it can not be shipped after oil & gas have been added. It had oil in the pump when it was shipped so this does not ring true. Besides I can completely empty the gas and let any residual evaporate and the oil can be drained. I do not need 2 power washers and certainly not one that doesn't work! Needless to say I am not a happy camper right now! I purchased this through AMAZON so hopefully their guarantee will help me with this problem. P.S. This machine is now on line for $100.00 less than my purchase price :( ... show more
Reviewed in the United States on August 21, 2019 by Valerie G.
    • Great pressure washer!
Style: 3600 PSI
I upgraded to this machine after using an electric pressure washer for the last couple of years. It is amazing how much easier cleaning task can be with more pressure and water flow. Assembly of the Simpson pressure washer was quick and easy. The Honda engine started right away. If you are looking for a solid machine this is it! ... show more
Reviewed in the United States on March 8, 2026 by Adam J Remlinger
    • I like it but not in love with it.
Style: 3600 PSI
This is a very nice washer. That being said not shire it’s a $675.00 with tax pressure washer but time will tell. The good started on the first pull. And did a good job on my driveway ran two tanks of gas though it about 4 hours running time. Nice power and engine ran smoothly. I did jump up to a 3/8 x 50 foot hose did not use the 5/16 hose that came with it. So I can’t say anything about it. Used a survive cleaner and a longer wand extension the one that comes with it is only about 13 inches long. So all in all with new hose and wand extension I have about $750 in this thing. The bad it moves all over the place on the driveway when it’s running so I put a old door Matt under it and it did stay put on the Matt so keep that in mind if you buy this thing you’re going to need some extra things too make it a little more useable. Also I used Honda oil in the engine instead of the oil that comes with it it’s a lot smaller than it looks in the picture and it’s not very heavy at all with the aluminum frame. So if you’re like me the size helps to store it as space is a problem with only a too car garage. I hope that it grows on me more as I use it. I do like it but I don’t love it for what I paid if that makes sense. ... show more
Reviewed in the United States on October 4, 2020 by Richard
    • Great quality
Style: 3600 PSI
The pressure washer itself is high quality. Did get slightly confused as the was 2 places to add oil to the engine. Other than that once set up it cranked in 2 pulls. Plenty of pressure.
Reviewed in the United States on April 1, 2026 by David Armstrong
    • Disapointed in manufacturer's packaging
Style: 3600 PSI
Review Image by Amazon Customer
Review Image by Amazon Customer
Review Image by Amazon Customer
Looks to be a good product. Bought it to use on my farm for various cleaning jobs. Ordered it 2-26-26, delivered 3-2-26. Opened box to assemble and use first time today 4-4-26. Found that the end of a threaded pipe that a hose connects to had suffered some damage in shipping. There was not sufficient protective packaging material at the point where the pipe was very close to the inside wall of the heavy corrugated shipping box. Lack of sufficient protective packaging allowed the pipe to contact the inside wall of the box. Something hard contacted the box sidewall with enough force that the box wall was punctured and the plastic cap on the pipe (used to protect the treads) was destroyed and allowed the threads of the pipe to be damaged, rendering it unusable. Now I must get a replacement part for the destroyed one. I can not rate the product for performance as yet. ... show more
Reviewed in the United States on April 4, 2026 by Amazon Customer
    • Price is high, but so is the quality.
Style: 3600 PSI
Really powerful, I had to brace myself to use it on a ladder, it actually kicks back. Really fast to unload and set up and it's made from quality materials that look good and work well. I'm hoping is does as well as my 24 year old Sears power washer that I died this summer. The seal blew on the pump, but i ran it and ran it for years. It started on the second pull after 20 years, it was awesome. I wanted to spend less, but honestly, you are not going to find a quality machine for $500. You get what you pay for, I buy things to last. My chain saw was purchased in 1993, My weed wacker 2000, both are Stihl. Stihl doesn't make a power washer so I chose this one after researching it for 3 months. So far, so good. I'll amend this after a Summer of use and then after a few years of use. ... show more
Reviewed in the United States on February 19, 2020 by Amazon Customer

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...