See how the MSH3125-S compares to other categories in our guide to the best pressure washers.

If you don’t have experience with gas power equipment, read up on proper methods before buying. The Honda GC190 engine has a pretty good track record, so we think this may have more to do with improper maintenance. There are some recurring reviews about the MSH3125-S having engine trouble, sometimes out of the box but mostly after being stored. The engine is mounted on a 1/4″ steel base plate which reduces vibration, and accessories are securely held in an integrated holster at the top of the frame. The frame is 16-gauge steel with 10” pneumatic wheels, designed like a trolley for easy lifting and rolling. axial cam pump is double-sealed, maintenance-free and features stainless steel pistons for better efficiency, along with a steel unloader to manage internal pressure.Īlthough it’s part of their residential series, Simpson built the MSH3125-S to the same standards as their commercial models. The Honda GC190 engine starts easily, runs smoothly and can be maintained by anyone (oil changes take minutes). This is the best engine and pump combination you’ll find on a residential gas pressure washer. The MSH3125-S is powered by a Honda GC190 engine and OEM Technologies axial cam pump. They don’t specifically mention substances, but it’s safe to say materials like moss, oil and sap can be easily washed away. With 3,200 PSI and 2.5 GPM, the company lists almost every common job as a suggested use, including vehicles, patios, fences, siding and driveways. The Simpson MSH3125-S sits on the border between medium and heavy-duty power, which allows it to handle the widest variety of jobs.

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