SIMPSON PS4240H Gas Pressure Washer Review
- Lots of power (much more than a car wash pressure sprayer)
- Diverse Tips Included
- Compact, Easy to start, Easy on fuel
- Reliable high performance premium HONDA GX390 Engine
- Maintenance free AAA Triplex Pump made by Comet
- Steel-Braided Quick Connect high pressure hose
- Oil Alert System Shuts Down Engine When Oil Level is Insufficient.
- Backed by a 3 Year Commercial Limited Warranty.
SIMPSON PS4240H Gas Pressure Washer Review
- HONDA GX390 Commercial Series Engine with Oil Alert
- AAA industrial triplex plunger pump provides higher pressure at the nozzle
- 50′ x 3/8″ Non-Marring Steel-braided Hose with Quick Connectors
- Welded steel frame, steel engine plate, solid steel axle and 13″ pneumatic tires
- Pro-style spray wand with 5 quick connect nozzle tips – 0°, 15°, 25°, 40°, and soap applicator nozzle
- Professional spray gun with safety lock-out
- Convenient on-board accessory storage for spray gun/wand, high pressure hose, and nozzles
- Down Stream Injection System
Honda GX390 OHV Engine
- Technologically Advanced and Easy to Start.
- 389cc, 4-Stroke, Overhead Valve Design is Highly Efficient And Reliable.
- Oil Alert System Shuts Down Engine When Oil Level is Insufficient.
- Cast Iron Cylinder Lasts Longer.
- Meets EPA and CARB Emission Standards.
- Backed by a 3 Year Commercial Limited Warranty.
Warranty Details:
- Engine – 3 Year Limited Commercial Warranty
- Pump – 5 Year Limited Warranty
- Frame – 10 Year Limited Warranty
(Note: Because of the greater risk of injury, we recommend no pressure washer that comes with a zero-degree replaceable nozzle or setting, no matter how well it cleans.)
SIMPSON PS4240H Gas Pressure Washer Results
SIMPSON PS4240H Gas Pressure Washer Review
This SIMPSON Pressure Washer is part of the Pressure washer test program. In our lab tests, Pressure washer models like the SIMPSON PS4240H are rated on multiple criteria, such as those listed below.
Cleaning: Versatility and efficiency in cleaning a range of surfaces. The better performers have multiple spray patterns that can cover various cleaning chores, from light, superficial cleaning to deep cleaning of concrete, decking, and other hard-to-clean surfaces.
Power: A combination of pressure, measured in pounds per square inch (psi), and flow, measured in gallons per minute (gpm). Higher pressure results in better cleaning of a given surface; coupled with a higher flow as well, you’ll get the job done the fastest.
Noise: A combination of measurements, based on dBA, reflecting the proximity of the operator to the pressure washer. While our Noise score averages measurements taken close by the machine and at the end of the hose’s typical reach, we strongly strongly recommend hearing protection for working close by a gas powered pressure washer in particular.
SIMPSON Gas Pressure Washer Offers

Engine
Engine Brand Honda GX
Starter Recoil
HP 13 HP
Fuel Tank Size 6.4 quarts
Consumer Engine Warranty 3 Years
Commercial Engine Warranty 3 Years
Pump
Pump Brand General
Pump Type Triplex Plunger
Adjustable Pressure Yes
Chemical Injection Siphon Tube
Water Temperature Cold
Pump Consumer Warranty 5 Years
Pump Commercial Warranty 5 Years
Water Pressure 4200 PSI
Water Flow 4 GPM
Hose
Hose Storage Hook
Hose Length 50 Feet
Hose Material Rubber
Hose Diameter 3/8 Inch
Hose Connections Quick-Connect
Spray Gun
Spray Gun Connection Quick-Connect
Spray Gun Grade Professional
Spray Gun Wand Single Wand
Spray Tips Quick Connect Tips (5)
Turbo Nozzle Sold Separately
SIMPSON PS4240H Gas Pressure Washer Review
This SIMPSON PS4240H Gas Pressure Washer has ample power and the instructions are very clear and easy to follow. This is important because it’s not difficult to have trouble operating these machines if you’re not familiar with how they work. The adjustable pressure dial on the wand is a nice feature, has a wide range from low to high. Everything about the unit seems high quality, the Honda engine, CAT pump, aluminum frame, pneumatic tires, 50′ heavy duty hose. Unit is compact but heavy, and much louder than a typical lawnmower.