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Stihl RB 400 - Spec Breakdown

The Stihl DIRT BOSS® RB 400 is a gas-powered pressure washer offering a maximum water pressure of 2700 PSI and flow of 2.7 GPM. (Read full specs)

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Stihl RB 400 2700PSI Gas Pressure WasherStihl RB 400 2700PSI Gas Pressure WasherStihl RB 400 2700PSI Gas Pressure WasherStihl RB 400 2700PSI Gas Pressure Washer
According to Stihl's Internet Sales Policy (opens in a new tab) and to the 10 reasons mentioned on this page (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 400 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

General
FuelGas-Powered
HandlingHand Truck
WaterCold (125°F max.)
PSI2700
GPM2.7
Cleaning Units7290
Engine196 cc 6.5 HP Kohler SH265 4-stroke OHV
PumpAxial
Features
FrameSteel tubing
Soap injectionVia siphon hose
Soap dilutionNo
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose25 ft
Hose storageHooks
Misc
Dimensions
(D x W x H)
Approx. 28.5 x 27.5 x 39.5 in
Weight90 lbs
Wheels2 wheels, pneumatic
Included accessoriesOil, wand, spray gun, high pressure hose, soap hose, 5 nozzles
SecurityLow oil, trigger lock and thermal relief valve
EmissionsUnknown
Warranty2 years

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

When you need a power washer that delivers top performance and can stand up to daily use, choose the STIHL RB 400 DIRT BOSS® pressure washer. It features a powerful 196 cc (6.5 hp) engine that can output 2,700 psi of water pressure at 2.7 gallons per minute. It also features the durability STIHL products are known for, with a brass manifold pump design, stainless steel valves and ceramic-coated pistons. There is also a cast-iron engine liner and a built-in shutdown feature when the oil level is low. The RB 400 DIRT BOSS® also features an easy start pump system and convenient detergent injector system. (source: Stihl (opens in a new tab))

Zoom on the Stihl RB 400

In summary, the Stihl RB 400 is a medium duty pressure washer, that offers an all-around versatile cleaning experience, and also:

  • spot cleaning of hard, paint-free surfaces and out-of-reach areas
  • intense cleaning of hard, unpainted surfaces
  • cleaning of painted and frail surfaces
  • applying detergent and cleaning solutions

Ahead are presented its power characteristics and design, its main features and any other additional features.

Power

The Stihl RB 400 in use

The Stihl RB 400

With a 196 cc (6.5 hp) engine, its axial pump delivers a pressure of 2700 PSI (roughly 45 times more than a standard garden hose) and a flow of up to 2.7 GPM (values claimed by the manufacturer), resulting in the Stihl RB 400's cleaning power of 7290 Cleaning Units.

The Kohler SH265 engine of this gas-powered pressure washer gets started by a classic pull-start mechanism.

A fuel tank with a maximum capacity of 0.95 gallon is used to store gasoline.

Design & Handling

The Stihl RB 400 offers superb mobility, with a hand truck design and approximate dimensions of D28.5 x W27.5 x H39.5 in. The robust and sturdy steel tubing frame offers longevity to the assembly. The folding handle enhances its mobility, while allowing for a convenient storage.

With a weight of 90 lbs, the model is not lightweight. Therefore, it may be challenging to manually carry it around and transport it. The main contributors to its weight are its 196 cc Kohler SH265 engine and steel tubing frame. However, its two pneumatic wheels play an important part in its maneuverability, as they allow for a smooth manipulation on the job.

Main Features

The Stihl RB 400 in use

The Stihl RB 400

Along with the Stihl RB 400 itself, the package also includes a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, which are discussed in further detail below.

  • Soap injection: While the device doesn't feature a soap tank, detergent supply is ensured by a siphon hose. It must be noted that the Stihl RB 400 doesn’t come with a soap dilution mechanism. Therefore, you must always make sure that your detergent is correctly diluted. When a soap nozzle is connected, the detergent will be added automatically to the water.
  • Pressure hose: The 25 ft high-pressure hose, which is included with the device, can be stored neatly on the unit itself when idle, using a set of convenient hooks.
  • Spray gun and wand: A side hook enables you to easily store the included classic ergonomic spray gun and its wand.
  • Nozzles: The 5 nozzles included with the device, and the respective surfaces which they’re the most suitable for, are shown in the following table.
 


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 400

The Stihl RB 400

  • Onboard storage: Stay prepared for any job with Stihl RB 400's handy storage area, which allows you to neatly store any nozzles and accessories which you may need for the 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: On top of an owner's manual (opens in a new tab) and the usual documentation to get you swiftly started, the Stihl RB 400 also comes with soap hose, spray gun, pressure hose, oil and wand.

Product Videos

The Stihl RB 400'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 400 compare to similarly priced pressure washers.

  • The Stihl RB 400 and its 2700 PSI, ranks amongst gas-powered pressure washers with a comparably low pressure output, considering the units that cost between $600 and $700. As for the device with the most powerful water stream, in this price range, one of the top products is the Lifan LFQ4515E-Elite with 4500 PSI.
  • In comparison to other devices in the above-mentioned price range, this washer and its 2.7 GPM (gallons per minute), has one of the lower GPM values. If rinsing away debris most efficiently is your priority, one of the devices with the highest GPM in this price range is the Simpson PS60843, which can reach up to 4 GPM.
  • With 7290 Cleaning Units (PSI x GPM), the RB 400 is on the low end when compared to other similarly priced gas-powered devices. If you consider the highest overall cleaning power as a really important factor, the Lifan LFQ4515E-Elite and its 18000 Cleaning Units has one of the highest cleaning efficiency of all the similarly priced units.

Here's a list of the most popular specific comparisons:

Price comparison

As you can see from this interactive chart, when compared to other gas-powered washers between 7000 and 7500 Cleaning Units, the Stihl RB 400 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:
  • Good range of nozzles included
  • Onboard storage
  • Several security features
WEAKNESSES:
  • On the expensive side
  • No soap tank
  • No detergent dilution mechanism
  • Low PSI for the price
  • Low GPM for the price
  • Low CU for the price

Do you own the Stihl RB 400 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 400 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.

Stihl RB 400
7 Total Score
1 review
Add your review
Ease Of Use
5
Value
3
Quality
10
Performance
10
1 Review
  1. 3.5
    Ease Of Use
    50
    Value
    30
    Quality
    100
    Performance
    100

    Very poorly designed, You can not just pull back on the handle to move the unit you must place you foot on the frame to get it to tilt back. Very difficult to get the pressure hose off the pump as well as the wand. 25 feet of hose is not very good it is too short, requiring a lot of moving when washing the house. Kohler is a good engine but you can not shot off the gas supply to run the carburetor dry, considering the relatively high price for its capacity you would hope it would be more user friendly.

    + PROS: plenty of pressure
    - CONS: not user friendly over priced
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