Description
The Westinghouse WPX3400 is a gas pressure washer published at 3400 PSI and 2.6 gallons per minute, driven by a 212cc four stroke Westinghouse overhead valve engine with a recoil starter. It carries by far the largest feedback history of any machine in this catalog, with more than twenty thousand ratings recorded. This review is written from the published specification fields and feature bullets. We do not own or operate the machine.
Carbon monoxide comes first on any gas machine
This engine produces carbon monoxide, which is colorless, odorless and can be fatal in an enclosed space before anyone realizes there is a problem. Never run this washer indoors, in a basement, in a crawl space, in a shed or in a garage. Leaving the garage door open does not make it safe. Operate outdoors only, clear of windows, doors and vents, with the exhaust pointed away from the building and away from where anyone is working.
Refuel outdoors with the engine cold. Westinghouse notes that all its pressure washers are functionally tested in the factory and may arrive containing residual oil or fuel odor, so a smell of fuel out of the box is expected rather than a fault.
Who this machine is for and what it settles
The WPX3400 settles the question of whether you can get contractor grade flow without a contractor grade price. At 2.6 gallons per minute it moves roughly twice the water of a good corded electric, and pressure and flow together are what determine cleaning speed. Westinghouse names decks, sidewalks, siding, fences, railings, garage floors, exterior walls, cars and patio furniture in its own copy, and the specification supports the harder end of that list.
The frame is 21 inches wide by 19.5 inches deep by 39 inches high with a published weight of 63 pounds and 12 inch high profile never flat wheels. That is a wheeled machine you roll rather than carry. If your work is genuinely limited to a car and a patio, the electric machines in the corded electric section avoid the fuel, the exhaust and the noise, at a large cost in flow.
The specifications that matter
Published items include the 212cc four stroke overhead valve engine with recoil start, a maintenance free axial cam pump, a 25 foot abrasion resistant Super-Flex hose, a lightweight high pressure spray gun, five quick connect nozzles at 0, 15, 25 and 40 degrees plus soap, a one gallon fuel tank, a half gallon onboard soap tank, and compatibility with M22 fitted accessories such as surface cleaners, undercarriage cleaners and foam cannons. Engine oil, tools and a quick start guide are stated as included, and Westinghouse states three year limited manufacturer service, labor and parts coverage. Feedback is recorded at 4.6 out of 5 across 20,648 ratings.
The full five tip set including a 40 degree wide fan is worth calling out, because several machines in the gas powered section ship without one and leave you with no gentle option for siding or vehicles.
Where the tank figures do not line up
The structured field labeled “Tank Volume” reads 0.5 gallons. The feature bullet describes two tanks: an easy to fill one gallon gas tank and a half gallon onboard soap tank. The structured field therefore appears to be reporting the detergent tank while the more important number for planning a work session, the fuel capacity, sits only in the bullet text. Neither is labeled clearly enough to be certain which the field refers to. Confirm the fuel capacity before you plan around run time, because Westinghouse publishes no run time figure at all.
The pressure figure is also stated two ways on the same listing. The product title reads “3400 Max PSI” and the feature bullet reads “3400 PSI” without the qualifier. Maximum pressure on a pressure washer is usually measured at initial discharge rather than sustained at the wand in use, so the safe reading is the one with the qualifier: treat 3400 as a ceiling. No working pressure figure is published to compare against.
Using it correctly
At 3400 PSI the jet can inject water and contaminants through skin. The resulting wound often looks like a small puncture and is a genuine surgical emergency. Never aim the wand at a person or an animal, never hold an object in your free hand while spraying it, and wear eye protection and closed footwear every time. Keep bystanders, children and pets out of the working area entirely.
Nozzle discipline does more for your results than pressure does. Start every unfamiliar surface with the 40 degree tip, hold the wand well back, and close the distance rather than reaching for a narrower spray. The 0 degree pencil jet concentrates the whole output into a point and will cut wood, remove mortar and strip paint to bare substrate. On lap siding always work downward and diagonally, because water driven upward gets behind the cladding and stays there. On decking keep the tip moving and parallel to the boards.
If you intend to use the M22 accessory compatibility for a surface cleaner, 2.6 gallons per minute comfortably exceeds the flow requirement of most residential surface cleaners, which is precisely the argument for a gas machine over the electrics.
Limits and gaps in the published data
The most notable gap is regulatory. This listing publishes no emissions compliance statement at all. There is no “Specification Met” field, no CARB certification claim and no 49 state compliance note, where competing gas machines in this catalog publish one or the other. Because California requires CARB certified engines for new equipment sales, a California buyer cannot tell from this listing whether the machine is legal to buy there. Confirm with Westinghouse before ordering if that applies to you.
Also unpublished: the pump manufacturer, run time per tank, oil type and capacity, and any maximum inlet water temperature or pressure. Cold water only is the safe assumption. Country of origin is not stated in the specification block either.
How it compares within this catalog
The direct alternatives at this output are the DEWALT 61147S at a slightly lower published pressure and flow, and the Simpson CM61083, which publishes the same 3400 PSI at 2.5 gallons per minute and states 49 state compliance explicitly. If you want a gas machine with an electric starter, the DEWALT DXPW3400PRNB-S publishes one, with the caveat that its battery is sold separately. Within Westinghouse itself, the WPX3000e is the electric machine on a comparable frame for anyone who wants to avoid an engine.
Who should buy it and who should not
Buy it if you want high flow, a complete five tip nozzle set, an onboard soap tank and the reassurance of a very large feedback history. Do not buy it if you are in California and cannot get an emissions compliance answer from Westinghouse, if you need a published run time, or if you cannot store and roll a 63 pound wheeled machine. Run it outdoors only, every time.
