How Greasebusters Pressure Washers Work and What They Clean Best

What Greasebusters does

Greasebusters is a pressure washer brand made by Simpson, a manufacturer based in Alabama. The line focuses on machines designed to cut through heavy grease and oil buildup—the kind you find on commercial kitchen equipment, garage floors, engine parts, and industrial machinery. Unlike general-purpose pressure washers, Greasebusters models come with heating systems that warm the water, which breaks down grease far more effectively than cold water alone.

The heated water reaches temperatures around 200 degrees Fahrenheit, depending on the model. That heat, combined with the pressure (typically 3,000 to 4,200 PSI), dissolves grease rather than just pushing it around. Most Greasebusters units also come with a burner that runs on gasoline or diesel, so you're not dependent on a hot water line at your location.

Key Takeaways

• Greasebusters machines heat water to around 200 degrees Fahrenheit, which dissolves grease instead of just spraying it away.
• These pressure washers work best on commercial kitchen hoods, restaurant floors, garage bays, and equipment caked with oil or grease.
• Most models run on gasoline or diesel fuel to power both the pump and the heating system, so you don't need a hot water hookup.
• Greasebusters are heavier and more expensive than cold-water pressure washers because of the heating equipment inside.
• You'll need to let the machine warm up for several minutes before starting to wash, and you should drain the tank if storing it for more than a few weeks.

When heated water makes the difference

Cold water pressure washers can remove dirt, mud, and loose debris, but they struggle with grease. Grease is oily and doesn't dissolve in cold water—it just gets pushed around or breaks into smaller puddles. Heat changes that chemistry. At 200 degrees, grease softens and breaks apart, so the pressure can actually remove it instead of chasing it across the floor.

This matters most in commercial kitchens, where grease builds up on hood vents, exhaust fans, and the walls behind cooking equipment. It also matters in auto repair shops, truck bays, and manufacturing facilities where machinery leaks oil. A restaurant owner or fleet manager using a cold-water washer would spend hours getting mediocre results; a Greasebusters machine does the job in a fraction of the time.

Residential driveways with light oil stains don't usually need heated water. But if you're cleaning a driveway that's been leaking from multiple vehicles for years, or if you're prepping a garage floor for new epoxy coating, the heat makes a real difference.

How the heating system works

Greasebusters machines have a fuel-fired burner—usually gasoline or diesel—that heats water as it flows through a coil inside the machine. You fill the fuel tank, start the engine, and let the burner run for a few minutes. The water temperature rises gradually, and once it reaches operating temperature (usually indicated by a gauge or light), you're ready to spray.

The burner runs continuously while you're using the machine, so it keeps the water hot throughout your job. This is different from a tank-style hot water heater, which stores a fixed amount of hot water and cools down as you use it. With a Greasebusters burner, you have a steady supply of heated water for as long as you need it.

You do need to let the machine warm up before you start spraying—usually 5 to 10 minutes depending on outside temperature and the model. Jumping straight into spraying with cold water can damage the heating coil. After you're done, most manuals recommend letting the machine cool slightly before shutting it down, and draining the tank if you won't use it for several weeks.

Typical Greasebusters models and their pressure ratings

Simpson makes several Greasebusters models, and they vary in pressure output and heating capacity. Entry-level models typically produce around 3,000 PSI, while commercial-grade units can reach 4,200 PSI or higher. The pressure you need depends on what you're cleaning: lighter grease buildup needs less pressure, while baked-on or years-old grease needs more.

Most Greasebusters machines are trailer-mounted or cart-style units, not handheld. They're built to stay in one place while you move the hose and wand around. This design makes them stable and easier to operate for long periods, but it also means they're not portable in the way a small residential pressure washer is. If you need to move it between job sites, you'll need a truck or trailer.

Prices vary widely based on pressure rating, heating capacity, and whether the unit is gas or diesel. A basic model might cost several hundred dollars, while a heavy-duty commercial unit can run into the thousands. Rental is also an option at many equipment rental shops if you have a one-time job.

Maintenance and storage

Greasebusters machines need regular maintenance to keep the heating system working. You should check the fuel level before each use, change the oil in the engine according to the manual (usually every 50 to 100 hours of operation), and inspect the heating coil for any visible damage or leaks. If you notice water dripping from the burner area or the machine not heating up, stop using it and have it serviced.

Winterization matters if you live in a cold climate or plan to store the machine for months. Drain the water tank and run the machine briefly to clear water from the heating coil and pump. Some owners add a fuel stabilizer to the gas tank to prevent the fuel from breaking down during storage. Check your manual for the specific steps for your model.

If you rent a Greasebusters machine, the rental shop usually handles maintenance and winterization. You just need to return it with a full fuel tank and clean exterior, as specified in the rental agreement.

Greasebusters versus other heated pressure washers

Simpson is not the only manufacturer of heated pressure washers, but Greasebusters is one of the most widely recognized brands, especially in commercial settings. Other brands like Karcher, Hotsy, and Mi-T-M also make heated units. The main differences usually come down to pressure rating, heating capacity, build quality, and price.

Greasebusters machines are generally considered reliable and easy to find parts for, which matters if you own one long-term. Rental shops often stock them because they're durable and familiar to commercial users. If you're comparing brands, look at the PSI rating, the water temperature, the fuel type, and whether replacement parts are available locally or online.

For most home and small business use, a Greasebusters unit in the 3,000 to 3,500 PSI range is sufficient. Commercial kitchens and heavy industrial work often need the higher-pressure models, but those also cost more and require more storage space.

Common uses in South Carolina

In South Carolina, Greasebusters machines show up most often in commercial kitchens along the coast and in Charleston, where restaurants need to keep their hoods and exhaust systems clean for health inspections. They're also common in auto repair shops throughout the state, particularly in the Upstate where there are more manufacturing facilities and truck repair operations.

Pressure washing contractors in South Carolina sometimes own or rent Greasebusters units for specialty jobs—cleaning the undercarriage of vehicles, removing years of grime from industrial equipment, or prepping commercial properties for sale. If you're hiring a pressure washing service for a grease-heavy job, asking whether they have a heated unit is a good way to know whether they can handle it properly.

Frequently Asked Questions

Can I use a Greasebusters machine on my house or deck?

Technically yes, but it's overkill for most residential cleaning. The heated water and high pressure can damage wood, composite decking, and siding if you're not careful. These machines are built for industrial and commercial grease removal, not general home cleaning. A standard cold-water pressure washer is safer and cheaper for typical household jobs.

Do I need a special nozzle or attachment for grease?

Greasebusters machines usually come with a 15-degree or 25-degree nozzle, which is narrower than a general-purpose nozzle and concentrates the pressure. Some operators use a turbo nozzle for extra cutting power on stubborn grease. The machine itself does most of the work through heat; the nozzle choice matters less than with cold water.

How long does it take to heat up?

Most Greasebusters units reach operating temperature in 5 to 10 minutes, depending on the outside temperature and how much water is in the system. On a cold day, it may take longer. Check your specific model's manual for the exact warm-up time, and don't start spraying until the temperature gauge shows you're ready.

Can I rent a Greasebusters machine instead of buying one?

Yes. Many equipment rental shops in South Carolina carry heated pressure washers, including Greasebusters models. Rental is a good option if you have a one-time job or want to test whether you need one before investing in purchase. Rental rates typically run by the day or week, and the shop handles maintenance and fuel.

What fuel should I use?

Most Greasebusters machines run on regular unleaded gasoline, though some commercial models use diesel. Check your machine's manual or the fuel cap label to confirm which type yours needs. Never mix fuel types, and use fresh fuel—old gasoline can clog the burner and damage the engine.