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Stihl RB 800 - 4200 PSI 4 GPM 429cc Gas Pressure Washer

The Stihl RB 800 is a gas-powered pressure washer offering a maximum water pressure of 4200 PSI and flow of 4 GPM. (Read full specs)

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Stihl RB 800 4200PSI Gas Pressure WasherStihl RB 800 4200PSI Gas Pressure WasherStihl RB 800 4200PSI Gas Pressure WasherStihl RB 800 4200PSI Gas Pressure Washer
According to Stihl's Internet Sales Policy (opens in a new tab), it is not possible to ship a NEW Stihl product in the USA. The only way to get the Stihl RB 800 shipped to your place is to get it second hand or refurbished on eBay. Online stores such as Acme Tools, Ace Hardware, and Northern Tool (links below) may allow online purchase and in-store pickup of Stihl products.

Features and Specifications

FuelGas-Powered
HandlingHand Truck
WaterCold (125°F max.)
PSI4200
GPM4
Cleaning Units16800
Engine429cc 14 HP Kohler CH440 4-stroke OHV
PumpAnnovi Reverberi Triplex
Pump materialBrass
FrameSteel tubing
Soap injectionVia siphon hose
Soap dilutionNo
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose50 ft, ⌀3/8
Hose storageHooks
Dimensions
(D x W x H)
Approx. 33.5 x 31 x 45.8 in
Weight168 lbs
Pressure controlValve
Wheels2 wheels, ⌀13", pneumatic
Included accessoriesOil, wand, spray gun, high pressure hose, soap hose, 5 nozzles
SecurityLow oil, trigger lock and thermal relief valve
EmissionsEPA
Warranty2 years
UPC886661293766

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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Description

This power washer is the most impressive one in the STIHL lineup. It is designed for heavy-duty commercial use and can get through tough cleaning jobs. With 4,200 psi of water pressure and 429 cc engine, the RB 800 cleans up the dirtiest jobs with ease. Its industrial design is made to withstand heavy daily use. (source: Stihl (opens in a new tab))

Zoom on the Stihl RB 800

In a nutshell, the Stihl RB 800 is a heavy duty, commercial pressure washer, which not only offers an all-around versatile cleaning experience, but that also allows:

  • precise spot cleaning of hard, unpainted surfaces, reaching elevated areas, and effectively removing stubborn stains
  • complete cleaning of hard surfaces, vehicle washing, and surface prep for painting
  • mild cleaning for delicate surfaces, and low-pressure cleaning for broader areas
  • applying detergents and cleaning agents, and rinsing off surfaces

The following sections will present you in detail its power characteristics and design, its main features and all the additional features it has to offer.

Power

The Stihl RB 800 in use

The Stihl RB 800

With a powerful 429cc (14 hp) engine powering it, the brass triplex pump of this unit are capable of achieving a pressure of 4200 PSI (approximately 70 times greater than that of a standard garden hose) and a flow rate of up to 4 GPM (values claimed by the manufacturer). Corresponding to these values is a cleaning power of 16800 Cleaning Units.

The Kohler CH440 engine of this gas pressure washer is activated by pulling a starter cord, following a traditional approach.

The pressure washer's tank has a maximum capacity of 1.8 gallon for storing gasoline..

Design & Handling

The Stihl RB 800's mobility is greatly enhanced by its hand truck design. The robust steel tubing frame guarantees longevity of the assembly, providing stability and protection for internal components, even under demanding working conditions. The folding handle enhances its mobility, while allowing for a convenient storage.

At 168 lbs, we can't really say that the unit is lightweight, and manually lifting or transporting it could be a significant challenge for users, especially if they need to move it frequently or navigate over uneven terrain. A key role in its final weight is played by its 429cc Kohler CH440 engine, the triplex pump and steel tubing frame. Despite this, the presence of two 13" pneumatic wheels reduces the complexity of moving the RB 800, even on rugged surfaces.

Main Features

The Stihl RB 800 in use

The Stihl RB 800

The Stihl RB 800's package includes a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, with a more detailed description below.

  • Soap injection: Even without a built-in soap tank, the device relies on a siphon hose to provide detergent. The Stihl RB 800 is not equipped with a soap dilution mechanism, and thus, it is up to the user to ensure the detergent’s correct dilution ratio when using it. The detergent is automatically mixed with the water flow by the pressure washer when a soap nozzle is connected.
  • Pressure hose: For easy organization, the included 50 ft ⌀3/8" high-pressure hose can be stored on the unit using a set of convenient hooks when it's not in use, ensuring a clutter-free workspace.
  • Spray gun and wand: Both the classic ergonomic spray gun and its wand may be conveniently stored in a side hook. The gun features a rotating auxiliary side handle to further improve the comfort of both left and right-handed users.
  • Nozzles: The following table provides information on the 5 included nozzles and their recommended surface uses.


15°

25°

40°

Soap
Concrete, brick, masonryUse with cautionSuitableSuitableSuitableSuitable
Siding, gutters, houseNot recommendedUse with cautionUse with cautionSuitableSuitable
Fencing, deck, patioNot recommendedUse with cautionUse with cautionSuitableSuitable
Lawn equipment, boat, RVNot recommendedUse with cautionUse with cautionUse with cautionSuitable

Note: The shape of the nozzles above is for illustration purposes only and may differ.
Red cross: Not recommended. Green check: Suitable. Orange check: Use with caution.

Other Features

The specs of the Stihl RB 800

The Stihl RB 800

  • Onboard storage: With the Stihl RB 800's handy storage area, you’ll always have all the necessary nozzles and accessories at hand and thus, you’ll be fully prepared for any job.
  • Safety: Safety of operation is enhanced by a low oil protection, a thermal relief valve (which helps to prevent internal pump damage) and a trigger lock mechanism (which prevents accidental operation).
  • Accessories: Besides the usual owner's manual (opens in a new tab) and documentation to get you promptly started, the Stihl RB 800 comes with oil, wand, pressure hose, soap hose and spray gun.

Product Videos

The Stihl RB 800's performance versus other pressure washers

The following charts are provided to give you an idea of how the key specs of the Stihl RB 800 compare to similarly priced pressure washers.

  • The Stihl RB 800, with a max water pressure of 4200 PSI, has one of the highest pressure outputs of the gas-powered products in the $1550-2000 price range.
  • At 4 GPM, this washer stands as one of the premier choices in the aforementioned price range, offering a high volume of water.
  • The RB 800, with its 16800 Cleaning Units (PSI X GPM) sits at the high end of the cleaning efficiency spectrum, when compared to other devices of similar price.
According to our stats, the following comparison is pretty popular: Stihl RB 800 vs Stihl RB 600.

Price comparison

As you can see from these interactive charts, when compared to other gas-powered washers between 16500 and 17000 Cleaning Units, the Stihl RB 800 is on the expensive side of the price range.

While certainly not the cheapest of its cleaning power range, purchasing it could most likely also mean enjoying the reliability of a high-end product.

The bottom line

STRENGTHS:
  • Triplex pump
  • Good range of nozzles included
  • Onboard storage
  • Several security features
  • High PSI for the price
  • High GPM for the price
  • High CU for the price
WEAKNESSES:
  • On the expensive side
  • No soap tank
  • No detergent dilution mechanism

Do you own the Stihl RB 800 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

About Stihl

Since revolutionizing the forestry industry in 1926 with the invention of the first two-person electric chainsaw, STIHL has become one of the top-selling brands of outdoor power equipment in the US and around the world. Their ever-growing product line includes gas-powered, corded-electric and battery products. Made in the USA and in China by over 2,000 dedicated employees at their state-of-the-art, dedicated, manufacturing facilities in Virginia Beach, VA, and in Qingdao, STIHL products are sold by local, authorized dealers in over 80 countries.

Warranty Information

The Stihl RB 800 is covered under a warranty for up to 2 years. This warranty may be limited and may not cover all parts of the unit.
For more information about the warranty of Stihl pressure washers, please consult Stihl's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-800-467-8445.

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