BE Honda GX390 4.2/4200 Belt Drive Pressure Washer Comet Pump
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BE Honda GX690 8.5 AR Pump Belt Drive
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Honda GX390 Gear Drive 5.5GPM 3000 PSI w/ Block Mounted K7 Unloader
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Electric Start 5.5 GPM Belt Drive Pressure Washer - Centurion Pump
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Pressure Ranger High-Flow Pressure Washing System
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3,200 PSI 2.5 GPM Cold Water Gas Pressure Washer Powerease 212CC Engine and CP Axial Pump
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BE Honda GX690 8.2 GPM General Pump Belt Drive
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Honda 10 GPM 3000 PSI Belt-Drive Skid Pressure Washer w/ General Pump & Electric Start Honda IGX800 Engine
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4,000 PSI 4.0 GPM Gas Pressure Washer w/ Honda GX390 Engine & General Triplex Pump
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4,000 PSI - 5.5 GPM Hot Water Pressure Washer with Honda GX690 Engine and CP Triplex Pump
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4,200 PSI 4.2 GPM Cold Water Gas Pressure Washer with Honda GX390 Engine and CP Triplex Pump -
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4,200 PSI 4.2 GPM Cold Water Gas Pressure Washer - B4213HSCS
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Honda GX390 3,200 PSI 5.2 GPM Cold Water Gas Pressure Washer Electric Start Belt Drive
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3,200 PSI 5.2 GPM Cold Water Gas Pressure Washer
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4,200 PSI 4.2 GPM Cold Water Gas Pressure Washer
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BE Honda GX390 4,200 PSI 4.2 GPM Pressure Washer w/ AR Pump
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BE Honda GX690 8GPM Hot Water Pressure Washer
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3,500 PSI - 8.5 GPM Hot Water Pressure Washer Honda GX690 Engine and AR Triplex Pump
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About Us
Situated just 10 minutes south of Portland in Oregon City, Expert Power Wash specializes in crafting premium, high-quality custom pressure washing skids and soft wash equipment.
As a local, family-owned business, we place our trust in God and uphold values of hard work, morals, and integrity. We firmly believe that by consistently adhering to these principles, we deliver the finest equipment to enhance your business.
With over 10 years of hands-on experience operating various pressure washing setups, including trailers, box trucks, flatbeds, vans, and skids, we gained invaluable insights into equipment functionality. Faced with breakdowns and failures, the commitment to resolving issues and continual improvement became paramount. Years of field experience have instilled confidence that Expert Power Wash produces the ultimate in pressure washing equipment—no flashy stickers or hype, just unwavering quality.
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How to choose a commercial pressure washer
Contractors usually shop by PSI. Production is decided by GPM. Pressure breaks the bond; volume carries the debris away and determines how fast you finish. Two machines at 3,500 PSI, one at 4 GPM and one at 8 GPM, are not the same tool - the 8 GPM machine will finish flatwork in roughly half the time.
Sizing by the work you bid
| Flow | Realistic use | Water supply |
|---|---|---|
| 4 to 4.2 GPM | Residential house washing, small flatwork, starting out | Most hose bibs will keep up |
| 5.5 GPM | Mixed residential and light commercial, a step up in surface cleaner size | Buffer tank recommended |
| 8 GPM and up | Commercial flatwork, parking lots and garages, multifamily, daily production work | Buffer tank required - often dual-fed |
If you are serious about growing a washing business, the machine we point people to is a gear drive Honda 8 GPM at 3,500 PSI with a Pulsar flow-sensitive unloader. That was our own sweet spot: a two-man crew on a skid with two 8 GPM machines, each running its own gun. Read the full breakdown in 4 GPM vs 5.5 GPM vs 8 GPM.
Belt drive, gear drive and direct drive
Direct drive is compact and cheap and runs the pump at engine speed, which shortens pump life under daily commercial use. Belt drive slows the pump down and isolates it from engine vibration. Gear drive does the same job in a more compact, more durable package and is what we build with at the top of the range. For a machine that runs every day, belt or gear drive pays for itself in pump rebuilds you do not do.
Details that decide how long a machine lasts
We block-mount unloaders rather than pump-mounting them, because constant pump vibration is what kills unloaders, and we run an oversized whip line from the pump to the unloader. We build on Honda engines only, with upgraded pumps from General, AR and Comet. If you need heat, a dedicated hot water machine is normally a hot water skid - an all-in-one pressure washer and heater - and that typically lands in the $9,000 to $15,000 range. See hot water units.
Want the machine built into a complete rig instead? See our custom skid and trailer builds or book a free discovery call.
Further reading
- 4 GPM vs 5.5 GPM vs 8 GPM: what size do you actually need?
- Hot water vs cold water: when it is worth the money
- How to adjust a pressure washer unloader valve
- Inside a 6.5 ft skid build: the machine, in detail
Common questions
Is PSI or GPM more important?
GPM, for almost every professional application. Pressure breaks the bond between dirt and surface, but flow carries it away and sets your production rate. Most professional work sits between 3,000 and 4,000 PSI, and the difference between a slow day and a fast one is whether you are running 4 GPM or 8.
What size pressure washer do I need to run a surface cleaner?
Match the surface cleaner to the machine, not the other way around. A 4 GPM machine runs a 16 inch cleaner comfortably; 5.5 GPM opens up 19 to 20 inch; 8 GPM and above is where the larger 24 inch and up cleaners start working properly. An oversized cleaner on an undersized machine just leaves stripes.
Do I need a buffer tank?
Once you are past about 5 GPM, usually yes. Most residential spigots will not reliably supply 8 GPM, and starving a pump is one of the fastest ways to destroy it. A buffer tank with a float valve lets the tank absorb the difference between what the property supplies and what the machine draws.
Belt drive or direct drive?
Direct drive is fine for occasional use and tight spaces. For a machine running every day, belt or gear drive slows the pump down and isolates it from engine vibration, and you will see it in how often you rebuild the pump.
Can I run two guns off one machine?
We would not. When we wanted two guns working we added a second machine. Splitting one pump between two operators halves the flow at each gun and both people end up working slowly.
