SIMPSON ALH3225 Aluminum Series Gas Pressure Washer review

Choose the exact KOHLER and AAA configuration

The SIMPSON ALH3225 reviewed here uses a KOHLER SH265 engine and AAA triplex pump on an aluminum frame. The maker identifies ALH3225 as part 60686 and ALH3225-S as part 60774. Its original 2019 catalog confirms that same combination.

This identification matters because neighboring Aluminum Series models use different engines, pumps and hose arrangements. A Honda engine or CAT pump on a related model should not appear as a feature of this one. Match the actual model and components before deciding whether the package suits your work.

The 35-foot hose is a practical difference

The exact configuration includes a 35-foot MorFlex high-pressure hose with M22 connections. Compared with a 25-foot arrangement, that can give you more working reach while leaving the machine at its appropriate station. It does not increase inlet-water capacity or eliminate hose management.

Trace the route around the work area and check where the cold-water supply will connect. More outlet reach is useful only when the engine can remain safely outdoors and the inlet supply stays adequate throughout the task.

Dial-N-Wash is actual pressure control

The original manual explains a Dial-N-Wash control that moves between MIN and MAX positions. That is a documented adjustment separate from selecting a nozzle's spray angle. It is a meaningful feature for someone whose requirement is real pressure control rather than a variable fan alone.

The control does not guarantee a safe setting for every coating or material. Use the original instructions, correct nozzle and appropriate technique. Do not attempt to raise pump pressure beyond its factory setting or treat a regulator as permission to use an aggressive jet on fragile surfaces.

The maximum figures are not a working pair

The exact manual labels 3200 PSI and 2.5 GPM as maxima. Its manufacturing-tolerance footnote does not establish a simultaneous working-output condition at those two numbers. This review therefore does not use them to pass a strict working-pressure-and-flow requirement.

That qualification does not erase the machine's configuration. It keeps an output comparison honest. The hose, pressure control, nozzle selection and supplies are separate, documented reasons to consider the ALH3225 without inventing a cleaning-performance score.

Five tips cover different stages

The package lists 0, 15, 25 and 40-degree rinse tips plus a soap nozzle. The original material chart separates hard, unpainted surfaces from more vulnerable wood, vehicle finishes and siding. The red 0-degree jet is specifically excluded for wood.

Detergent uses the black low-pressure tip, with Dial-N-Wash in its MAX position as instructed. That control position is a setup requirement for injection; it is not proof that soap is delivered at the maximum rinse pressure. The documented detergent path draws from a separate container rather than an included onboard tank.

The supply and station decide whether it fits

The original instructions require clean, cold supplied water, at least 5 GPM delivery and 20 PSI, with a stated 20–100 PSI inlet range. Do not confuse that inlet flow with delivered cleaning flow. The reviewed package does not establish bucket-water self-priming.

The cart uses 10-inch pneumatic wheels. They help with appropriate ground but add an inflation consideration and do not solve lifting or loading. Consider the complete route into storage before assuming an aluminum frame makes handling effortless.

Professional scope still includes ownership work

The maker describes contractor tasks including deck cleaning, restoration and paint preparation. That is a useful scope reference, not a promise that every surface tolerates the same pressure. Engine oil, fuel, hot components, nozzle care and storage remain part of the routine.

Choose this exact ALH3225 when its 35-foot hose, Dial-N-Wash and KOHLER/AAA arrangement suit an outdoor station with the required water. Look elsewhere when a verified working-output pair, included flat-surface cleaner, onboard detergent tank or container-water operation is essential.