Simpson Cleaning Universal 16.5" Pressure Washer vs Westinghouse WPX3400 Gas Pressure Washer, 3400 PSI
Updated July 2026 — Westinghouse WPX3400 Gas Pressure Washer, 3400 PSI leads on weight and height.
The Simpson surface cleaner is a budget-friendly attachment for existing pressure washers, while the Westinghouse is a powerful standalone unit. The choice depends on your cleaning needs.
Why Simpson Cleaning Universal 16.5" Pressure Washer is better
Price
Simpson is significantly cheaper at $99.
Compatibility
Works with both gas and electric pressure washers.
Ease of Use
Quick connection for easy setup.
Why Westinghouse WPX3400 Gas Pressure Washer, 3400 PSI is better
Power
3400 PSI and 2.6 GPM for deep cleaning.
Versatility
Standalone unit with onboard soap tank.
Durability
Heavy-duty steel frame construction.
Overall score
Specifications
| Spec | Simpson Cleaning Universal 16.5" Pressure Washer | Westinghouse WPX3400 Gas Pressure Washer, 3400 PSI |
|---|---|---|
| Pressure | 4000 PSI | 3400 PSI |
| GPM | 2.5 GPM | 2.6 GPM |
| Material | Stainless Steel | Steel |
| Engine | N/A | 212cc Gas |
| Soap Tank | No | Yes |
Dimension comparison
Overview of the Products
When comparing the Simpson Cleaning Universal 16.5" Pressure Washer Surface Cleaner and the Westinghouse WPX3400 Gas Pressure Washer, both are built for effective cleaning but cater to different needs and budgets. The Simpson surface cleaner is priced at $99.00, while the Westinghouse pressure washer is significantly higher at $349.00, making it about 253% more expensive.
The Simpson surface cleaner is designed for use with gas and electric cold water pressure washers, specifically targeting large surfaces like driveways and patios. In contrast, the Westinghouse pressure washer is a standalone gas-powered unit that offers high pressure and versatility for various cleaning tasks. This fundamental difference in functionality sets the stage for a deeper exploration of each product.
Cleaning Efficiency
The Simpson Cleaning Universal surface cleaner excels in efficiency, providing a 16.5-inch diameter that allows it to cover large areas quickly, achieving 10 times more coverage than a standard nozzle. This feature is particularly beneficial for those tackling extensive cleaning jobs on flat surfaces.
On the other hand, the Westinghouse WPX3400 delivers a powerful 3400 PSI and 2.6 GPM, making it ideal for deep cleaning tasks. Its performance is particularly strong for tough surfaces like concrete, wood, and metal. The combination of high pressure and a built-in soap tank enhances its cleaning capabilities, making it suitable for a variety of applications beyond just flat surfaces.
Usability and Design
The Simpson surface cleaner's design focuses on ease of use. It features a 1/4-inch quick connection that makes it compatible with most spray wands, allowing users to hook it up effortlessly. Additionally, the cleaner includes a nozzle cleaning tool to maintain performance over time.
Conversely, the Westinghouse WPX3400 is designed for mobility and durability, featuring a tough steel frame and 12-inch high-profile, never-flat wheels. This makes maneuvering around obstacles simpler during cleaning tasks. The high-pressure spray gun and five quick-connect nozzles add versatility, catering to various cleaning needs. This usability design appeals to consumers looking for a comprehensive cleaning solution.
Price Comparison
At $99.00, the Simpson Cleaning surface cleaner is much more budget-friendly than the Westinghouse WPX3400, which retails for $349.00. This price difference of $250.00 represents about a 253% increase in cost for the Westinghouse model. For consumers primarily interested in enhancing their existing pressure washer's capabilities without significant investment, the Simpson surface cleaner is a practical choice.
However, it’s essential to consider what you’re getting for that price. The Westinghouse pressure washer not only functions as a standalone unit but also offers powerful performance and multiple features that justify its higher price tag. This makes it a worthwhile investment for those who require a robust cleaning solution for various surfaces and heavy-duty tasks.
Versatility and Compatibility
The versatility of the Simpson surface cleaner is noteworthy as it can be used with gas and electric pressure washers ranging from 2000 PSI to 4000 PSI. This compatibility allows the cleaner to fit into a wide range of existing setups, making it an attractive add-on for consumers who already own a pressure washer.
In contrast, the Westinghouse WPX3400 is a self-contained unit with a powerful 212cc engine that does not require an external pressure washer. Its onboard soap tank, combined with five nozzle options, extends its versatility to different cleaning situations, from cars to fences and patios. This feature allows users to adapt their cleaning methods based on the task at hand, delivering comprehensive usability.
Durability and Construction
Durability is a vital factor in any cleaning equipment. The Simpson surface cleaner features a stainless steel construction that resists corrosion and enhances longevity. This quality ensures that the product maintains its performance over time, making it a reliable choice for regular use.
On the other hand, the Westinghouse WPX3400 is built with a heavy-duty steel frame and a maintenance-free axial cam pump. This robust construction and design provide confidence in tackling tough cleaning jobs without the worry of wear and tear. The added benefit of a three-year limited manufacturer service coverage further enhances its appeal, ensuring that users are protected against potential defects.
Customer Reception
Both products have garnered attention in the market, but they serve different segments of consumers. The Simpson Cleaning surface cleaner has a sales rank of 12,175, indicating a decent presence among similar products, especially for those looking for an affordable attachment to enhance pressure washer efficiency.
In contrast, the Westinghouse WPX3400 has a significantly better sales rank of 695, showcasing its popularity and acceptance among users. This higher rank suggests that consumers are more inclined towards investing in a standalone unit that offers comprehensive cleaning power and versatility, despite its higher price.
Which should you buy?
Deciding between the Simpson Cleaning Universal 16.5" Pressure Washer Surface Cleaner and the Westinghouse WPX3400 Gas Pressure Washer largely depends on your specific cleaning needs and budget. If you are looking for an affordable attachment that enhances the capabilities of an existing pressure washer, the Simpson surface cleaner at $99.00 is an ideal choice. However, if you require a more powerful, standalone cleaning solution that can tackle a variety of surfaces and tasks, the Westinghouse WPX3400, priced at $349.00, offers a robust option with advanced features.
Ultimately, consider how often you'll use the equipment and the types of cleaning tasks you anticipate. Each product has its strengths, catering to different user requirements and preferences in the pressure washer market.

