Simpson Pro Series Pressure Washers: Three Professional-Grade Models Compared

Introduction

Simpson has been building pressure washers for professional users for years, and the Pro Series shows how much of that experience has filtered down into a cohesive lineup. As one of the largest and most vertically integrated gas pressure washer manufacturers in North America, Simpson controls the production of nearly every major component, and the Pro Series is designed, engineered, and manufactured in the USA.

The series is available in three configurations, ranging from 3,500 PSI at 2.5 gallons per minute up to 4,000 PSI at 3.5 gallons per minute. In this comparison we break down what all three models share, and where each one fits.

What Makes the Pro Series Stand Out

The defining trait of the Pro Series is vertical integration. The FNA group, which makes Simpson pressure washers, also manufactures the CRX engines, AAA pumps, hoses, and even the frame itself. That level of control is rare in this category, and it shows in how consistently the components are matched to each other.

Every unit ships with an industry-leading polyurethane high-pressure hose that is non-marring and claimed to be three times more abrasion resistant than rubber hoses. It is also manufactured in the USA. You additionally get a range of nozzles and an ergonomically designed spray gun.

Assembly is straightforward: attach the handle, assemble the wand, add fuel and oil, and you are ready to work in about 10 minutes.

CRX Engines: The Power Plant

The CRX engines that power the Pro Series are designed for heavy-duty professional use. They offer easy starting, reliable performance, and low oil engine shutdown, which protects the engine if the oil level drops too far.

The team behind the CRX engines backs them with a 5-year warranty, a strong signal of confidence in their durability. Beyond pressure washers, the same engines are also used in generators, semi-trash pumps, and chemical pumps, and they are suitable for repowering other equipment as well.

Pumps Built for Professional Duty

The AAA pumps featured on the Pro Series are built for the same heavy-duty professional use as the engines, and they carry their own 5-year pump warranty. These pumps undergo CA CPC 100 certification for pressure and flow, which means the ratings Simpson publishes should be exactly what you experience in the field.

They also feature a fully integrated adjustable unloader, letting you dial in the precise pressure a job requires rather than running the machine at full output all the time.

Simpson Pro Series PS61374

The PS61374 is the entry point to the Pro Series and features the CRX 210 engine with 3,500 PSI and 2.5 gallons per minute. That output is well suited to routine cleaning work such as driveways, siding, and decks, while still carrying the same professional-grade engine, pump, hose, and frame package as the rest of the line.

If your work does not demand maximum pressure, this model delivers the Pro Series build quality at the most accessible level of the lineup.

Simpson Pro Series PS61370

The PS61370 sits in the middle of the line, pairing the CRX 225 engine with 3,700 PSI at 2.5 gallons per minute. The extra pressure over the PS61374 gives you more cleaning power on stubborn surfaces while keeping the same flow rate.

It is a sensible middle ground for users who want more headroom than the base model without moving to the highest-output configuration.

Simpson Pro Series PS61371

The PS61371 is the highest-performing model in the series, with the CRX 340 engine, 4,000 PSI, and 3.5 gallons per minute. The jump in both pressure and flow makes it the choice for demanding professional work where throughput matters as much as power.

If you are cleaning large surfaces regularly, the higher flow rate translates directly into faster job completion.

Warranty and Availability

Simpson Pro Pressure Washers are available exclusively at Lowe’s. In addition to the 5-year warranties on the engine and the pump, the frame carries a 10-year warranty, giving the whole machine long-term coverage.

Conclusion

The Simpson Pro Series offers professional-grade performance and reliability combined with high value, driven by CRX engines and AAA pumps with vertically integrated manufacturing behind every component. Choose the PS61374 for everyday cleaning at 3,500 PSI, the PS61370 for a mid-range step up to 3,700 PSI, or the PS61371 for maximum output at 4,000 PSI and 3.5 gallons per minute.