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Simpson 3400 PSI Gas Pressure Washer, 2.5 GPM vs Westinghouse Universal 16.5” Pressure Washer

Updated August 2026 — Simpson 3400 PSI Gas Pressure Washer, 2.5 GPM wins on mobility and cleaning power, Westinghouse Universal 16.5” Pressure Washer wins on warranty.

The Simpson 3400 PSI Gas Pressure Washer is a powerful standalone unit ideal for various cleaning tasks, while the Westinghouse attachment enhances existing pressure washers but lacks standalone functionality.

Why Simpson 3400 PSI Gas Pressure Washer, 2.5 GPM is better

Power

3400 PSI for effective cleaning

Mobility

10-inch pneumatic tires for easy transport

Durability

Welded steel frame with powder-coated finish

Why Westinghouse Universal 16.5” Pressure Washer is better

Price

$89.99 is significantly cheaper

Compatibility

Works with both gas and electric washers

Cleaning Area

16.5-inch cleaning area for flat surfaces

Overall score

Simpson 3400 PSI Gas Pressure Washer, 2.5 GPM
85
Westinghouse Universal 16.5” Pressure Washer
72

Specifications

SpecSimpson 3400 PSI Gas Pressure Washer, 2.5 GPMWestinghouse Universal 16.5” Pressure Washer
Engine208 cc CRXN/A
Pump TypeAxial CamN/A
Quick-ConnectYesYes
WarrantyN/A180 days
Surface CleanerNoYes

Dimension comparison

Simpson 3400 PSI Gas Pressure Washer, 2.5 GPMWestinghouse Universal 16.5” Pressure Washer

Overview of the Simpson 3400 PSI Gas Pressure Washer

The Simpson 3400 PSI Gas Pressure Washer is designed for homeowners looking to tackle a variety of outdoor cleaning tasks. With a price of $329.00, this pressure washer offers a powerful 3400 PSI and a flow rate of 2.5 gallons per minute (GPM). It is crafted to handle tough jobs like cleaning decks, driveways, and vehicles. The unit's 208 cc CRX engine and maintenance-free pump ensure reliability.

In contrast, the Westinghouse Universal 16.5” Pressure Washer Surface Cleaner Attachment, priced at $89.99, is an accessory designed to enhance the cleaning capabilities of your existing pressure washer. It boasts a maximum pressure of 4400 PSI and is compatible with both gas and electric models. While the attachment provides professional-level cleaning, it requires a compatible pressure washer to function effectively.

Key Features of the Simpson 3400 PSI Gas Pressure Washer

The Simpson 3400 PSI Gas Pressure Washer is equipped with several features that make it suitable for residential use. It includes a 25-foot high-pressure hose, which allows for extended reach during cleaning. The machine is designed for easy mobility with 10-inch pneumatic tires that roll smoothly over various terrains. Additionally, it comes with four quick-connect tips for different cleaning tasks, enhancing versatility.

In comparison, the Westinghouse attachment emphasizes its ease of use, featuring a 1/4" quick-connect fitting that allows for seamless attachment to compatible pressure washers. Its design is targeted towards achieving professional results on flat surfaces, making it ideal for tasks like cleaning patios and driveways. Although it lacks the standalone capabilities of a pressure washer, it can significantly improve the performance of an existing unit.

Performance Comparison

When it comes to performance, the Simpson 3400 PSI Gas Pressure Washer stands out with its powerful engine and pump, delivering consistent pressure for effective cleaning. The combination of 3400 PSI and 2.5 GPM ensures that it can handle a range of surface types and stubborn stains.

On the other hand, the Westinghouse attachment offers a higher maximum pressure of 4400 PSI, making it a powerful tool for extensive cleaning tasks. However, this pressure is only realized when attached to an appropriate pressure washer. Therefore, while the attachment is powerful, its effectiveness ultimately depends on the base unit's capabilities.

Durability and Build Quality

The Simpson 3400 PSI Gas Pressure Washer is built with a welded steel frame that features a powder-coated finish, ensuring durability and resistance to corrosion. This construction helps the unit withstand various outdoor conditions, making it a reliable choice for homeowners. The machine's design is also focused on easy assembly and transport.

In comparison, the Westinghouse surface cleaner attachment is made of durable stainless steel, designed for longevity and ease of storage. It is lightweight, which enhances portability, but as an attachment, it relies on the durability of the base pressure washer for overall performance and longevity.

Pricing and Value for Money

The Simpson 3400 PSI Gas Pressure Washer is priced at $329.00, and when compared to its average price over the last 90 days of $354.12, it offers a reasonable value for a powerful gas pressure washer. Its features and capabilities justify the investment for homeowners seeking an effective cleaning solution.

Contrastingly, the Westinghouse Universal Surface Cleaner Attachment retails for $89.99. This price represents a significant savings, about 73% cheaper than the Simpson washer. However, it is essential to consider the additional cost of a compatible pressure washer if you do not already own one. Thus, while the attachment is economically priced, its value is contingent on the prior investment made in a pressure washer.

Mobility and Ease of Use

The Simpson 3400 PSI Gas Pressure Washer is designed with mobility in mind. The 10-inch pneumatic tires and balanced layout allow for easy transportation across various terrains, enhancing user experience during cleaning tasks. Additionally, the included ergonomic spray gun and 16” wand facilitate ease of use.

In contrast, the Westinghouse attachment is lightweight and easy to handle, making it straightforward to attach and detach from compatible pressure washers. Its simple design allows users, whether professionals or homeowners, to tackle cleaning tasks without extensive training or experience. However, it lacks the mobility features that stand-alone pressure washers provide.

Maintenance Considerations

Maintenance for the Simpson 3400 PSI Gas Pressure Washer is relatively low due to its maintenance-free OEM Technologies axial cam pump. The low-oil shutdown feature further enhances reliability, ensuring the engine operates optimally.

On the other hand, the Westinghouse attachment requires minimal maintenance as well, primarily needing routine cleaning and storage considerations. However, it is important to remember that the pressure washer to which it connects may require regular maintenance, depending on the model and usage frequency.

Which should you buy?

Choosing between the Simpson 3400 PSI Gas Pressure Washer and the Westinghouse Universal 16.5” Pressure Washer Surface Cleaner Attachment ultimately depends on your needs. If you are looking for a standalone solution that provides powerful cleaning capabilities for various outdoor tasks, the Simpson pressure washer is the better choice. It offers a robust performance, ease of mobility, and reliability for residential cleaning jobs.

Conversely, if you already own a compatible pressure washer and are seeking to enhance its cleaning power, the Westinghouse attachment presents a cost-effective option. Its higher PSI capabilities make it suitable for achieving professional-level results on flat surfaces. Overall, evaluate your current equipment and cleaning requirements to make the best decision for your home.