Diamond All Pro Pressure Washers: What They Do and Who They're Built For

What the Diamond All Pro is and how it compares to other pressure washers

The Diamond All Pro is a gas-powered pressure washer made by Pressure Pro, a manufacturer based in the United States. It sits in the mid-range of residential and light commercial equipment—more powerful than basic homeowner models, but not as heavy-duty as industrial machines designed for daily professional use.

The All Pro line comes in several configurations, typically ranging from 3,000 to 4,200 PSI (pounds per square inch) with flow rates between 2.5 and 4 gallons per minute. That power level handles most common outdoor cleaning jobs: house siding, driveways, decks, fences, and light commercial surfaces. It's stronger than electric pressure washers you might rent at a hardware store, but it requires fuel, maintenance, and more storage space.

Pressure Pro positions the Diamond All Pro as a step up from consumer-grade equipment but below the professional-grade machines that cost significantly more and are built to run eight hours a day, five days a week. If you're cleaning your own property regularly or doing occasional work for neighbors, this sits in a practical middle ground.

Key Takeaways

• The Diamond All Pro is a gas-powered pressure washer with 3,000 to 4,200 PSI, suitable for residential driveways, siding, decks, and light commercial work.
• It requires regular maintenance including oil changes, spark plug replacement, and fuel stabilizer if stored for long periods.
• You'll need to buy or rent a trailer to transport it safely, and it takes up significant garage or shed space.
• Operating costs include fuel, oil, spark plugs, and occasional pump repairs, which add up over time compared to electric models.
• The machine is loud (typically 85 to 90 decibels) and produces exhaust, so early morning or afternoon use is considerate to neighbors.

Engine type and fuel requirements

The Diamond All Pro runs on a gasoline engine, usually a Honda or Kohler model depending on the specific configuration you purchase. Gas engines deliver the power needed for tougher jobs, but they come with ongoing requirements: you must keep fresh fuel in the tank, change the oil regularly, and winterize the machine if you live in a cold climate or plan to store it for months.

Fuel costs vary with gas prices in your area, but expect to spend roughly $5 to $15 per hour of operation, depending on the model and how hard you're running it. If you're using it for a few hours on a Saturday, that's manageable. If you're thinking about running it daily for a side business, those costs add up quickly and may make a diesel model or electric option more economical.

You'll also need to decide whether to use ethanol-free fuel or add fuel stabilizer before storage. Ethanol-blended gasoline can gum up the carburetor if the machine sits unused for weeks or months, which is a common problem with seasonal equipment. Many owners buy small quantities of ethanol-free fuel or add stabilizer to regular gas to avoid expensive repairs.

Maintenance and repair expectations

Gas pressure washers require more hands-on care than electric models. Before each use, check the oil level and top it off if needed. After every 50 to 100 hours of operation, you'll change the oil—a job that takes 15 minutes and costs $10 to $20 for the oil itself. Spark plugs typically need replacement every 100 to 200 hours, and the air filter needs cleaning or replacement depending on dust conditions where you work.

The pump itself—the part that pressurizes the water—is the most expensive component to repair or replace. Pumps can last 500 to 1,000 hours with proper maintenance, but if you run the machine without water, use dirty water, or skip oil changes, pump failure comes much sooner. A replacement pump can cost $300 to $800, which is a significant hit if you're not running a business that covers those costs.

Many owners find it worthwhile to have a local small-engine repair shop service their machine annually, especially before the busy season. That typically costs $75 to $150 and catches problems before they become expensive. If you're handy and comfortable working on small engines, you can do much of this yourself with a basic toolkit and YouTube tutorials.

Storage, transportation, and space requirements

The Diamond All Pro weighs between 200 and 300 pounds depending on the model, which means you cannot simply carry it to your truck. You'll need a trailer, a truck bed with a ramp, or a dolly rated for that weight. If you don't own a trailer, renting one costs $20 to $50 per day, which adds to the cost of any job you do away from home.

Storage is another practical consideration. The machine needs a dry place—a garage, shed, or covered area—because leaving it outside in rain or snow accelerates rust and corrosion. If your garage is already tight on space, a 300-pound pressure washer takes up real estate. Some owners build a simple wooden frame to hang it on the wall, which saves floor space but requires installation.

Before storing for winter or for several months, drain the fuel tank or run the engine until it's empty, then add fuel stabilizer to the small amount of gas that remains. This prevents the carburetor from gumming up. If you skip this step, you may face a $100+ repair bill when you try to start it again in spring.

Noise and environmental considerations

Gas engines are loud. The Diamond All Pro typically produces 85 to 90 decibels of noise, which is roughly the volume of a lawnmower or leaf blower. That's loud enough that neighbors will hear it from several houses away, especially in quiet residential areas. If you're planning to use it regularly, check your local noise ordinances—many communities restrict outdoor power equipment to certain hours, often 8 a.m. to 5 p.m. on weekdays and 9 a.m. to 5 p.m. on weekends.

The machine also produces exhaust fumes, which means you should not use it in enclosed spaces or directly upwind of open windows. If you're cleaning a patio attached to your house, position yourself so the exhaust blows away from the building and your neighbors' properties.

Electric pressure washers are quieter (around 75 decibels) and produce no emissions, which is why some communities are moving toward restrictions on gas equipment. If you live in an area with strict environmental regulations or noise rules, an electric model may be a better long-term choice despite lower power output.

Cost comparison: Diamond All Pro versus alternatives

A new Diamond All Pro typically costs between $1,500 and $3,000 depending on the PSI rating and whether you buy it from a dealer or online. That's a significant upfront investment compared to renting a pressure washer for $50 to $100 per day or buying a consumer-grade electric model for $300 to $600.

If you plan to use the machine only once or twice a year, renting makes financial sense. If you use it monthly or more often, ownership breaks even within a year or two. If you're considering using it to start a pressure-washing business, the Diamond All Pro is a reasonable entry point, though you'll want to factor in fuel, maintenance, insurance, and transportation costs before setting your prices.

Used Diamond All Pro machines appear regularly on Facebook Marketplace, Craigslist, and eBay, often priced $800 to $1,500. Buying used saves money but carries risk: you don't know the maintenance history, and repair costs can wipe out your savings. If you go this route, ask the seller for maintenance records, run the engine before you buy, and budget for a professional inspection by a small-engine repair shop ($50 to $100).

Who should and shouldn't buy a Diamond All Pro

The Diamond All Pro makes sense if you own a home with a large driveway, multiple decks, or significant exterior surfaces you clean regularly; if you live in an area where you can rent equipment only at inconvenient times or locations; or if you're starting a pressure-washing side business and want equipment that's reliable and not at the absolute bottom of the price range.

It's less practical if you live in an apartment or small home with limited storage; if you have noise or emissions restrictions in your area; if you clean surfaces only once or twice a year; or if you're not comfortable maintaining a gas engine. In those cases, an electric pressure washer or a rental arrangement works better.

The Diamond All Pro is also not the right choice if you need industrial-grade equipment for daily commercial use. Professional contractors typically move up to larger, diesel-powered machines or electric models designed for continuous operation, because the cost per hour of operation is lower and downtime is more expensive than the equipment itself.

Frequently Asked Questions

Can I use the Diamond All Pro on my house siding without damaging it?

Yes, but with caution. At 3,000 to 4,200 PSI, the machine can strip paint or damage wood siding if you hold the nozzle too close or use too narrow a spray pattern. Start at 25 to 30 feet away and move closer only if needed. Use a 40-degree or wider nozzle, never a 0-degree pinpoint. Test on an inconspicuous area first. Vinyl siding is more forgiving than wood, but the same rules apply.

How often do I need to change the oil?

Check the oil level before every use and top it off if it's low. Change the oil completely every 50 to 100 hours of operation, or at least once a year if you use it less frequently. The exact interval depends on your engine model—check the manual that came with your machine. Skipping oil changes is the fastest way to damage the engine.

What's the difference between the Diamond All Pro and other Pressure Pro models?

Pressure Pro makes several lines at different price points. The Diamond All Pro is mid-range: more durable than their consumer models but less expensive than their professional-grade equipment. The main differences are PSI, flow rate, pump quality, and warranty length. Compare the specific model numbers and specs before buying, because "All Pro" is a line name, not a single machine.

Can I use well water or dirty water in the Diamond All Pro?

No. Always use clean, filtered water from a municipal supply or a clean tank. Sediment and minerals in well water or dirty water will clog the pump and cause expensive damage. If you must use well water, install a sediment filter on the intake hose. This is one of the most common causes of pump failure and warranty disputes.

Is it worth buying a used Diamond All Pro?

It can be, if the seller has maintenance records and the engine runs smoothly. Expect to pay $800 to $1,500 for a used model. Before buying, ask about oil changes, pump service history, and how many hours it has run. Have a small-engine repair shop inspect it for $50 to $100. If the seller won't let you inspect it or has no maintenance history, walk away—the savings aren't worth the risk.