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Stihl RB 400 - 2700 PSI 2.7 GPM 196cc Gas Pressure Washer

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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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 400 shipped to your place is to get it second hand or refurbished on eBay. Online stores such as Acme Tools, Ace Hardware, and Farm & Fleet (links below) may allow online purchase and in-store pickup of Stihl products.

Features and Specifications

FuelGas-Powered
HandlingHand Truck
WaterCold (125°F max.)
PSI2700
GPM2.7
Cleaning Units7290
Engine196cc 6.5 HP Kohler SH265 4-stroke OHV
PumpAxial
FrameSteel tubing
Soap injectionVia siphon hose
Soap dilutionNo
Nozzles0°, 15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose25 ft
Hose storageHooks
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
EmissionsEPA
Warranty2 years
UPC886661293711

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 a nutshell, the Stihl RB 400 is a medium duty pressure washer, which not only offers an all-around versatile cleaning experience, but that also allows:

  • spot cleaning of hard, unpainted surfaces, reaching high areas, and removing stubborn stains
  • comprehensive cleaning of hard surfaces, vehicle washing, and readying surfaces for painting
  • delicate surface cleaning, andbroad area cleaning with reduced pressure
  • using cleaning solutions, and rinsing surfaces to remove residue

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 400 in use

The Stihl RB 400

With a 196cc (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.

Initiating the Kohler SH265 engine of this gas pressure washer is achieved through a classic pull-start process.

Fuel for the pressure washer is housed in a tank capable of holding up to 0.95 gallon of gasoline..

Design & Handling

The Stihl RB 400 is very mobile, due to its hand truck design and approximate dimensions of D28.5 x W27.5 x H39.5 in. 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 90 lbs, this unit's substantial weight makes it quite a challenge for users to lift and maneuver, particularly on uneven surfaces where its heft can become even more apparent. The main contributors to its weight are its 196cc Kohler SH265 engine and steel tubing frame. However, the incorporation of two pneumatic wheels makes navigating the RB 400 less cumbersome, even on uneven terrain.

Main Features

The Stihl RB 400 in use

The Stihl RB 400

The Stihl RB 400'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: Despite the absence of a soap tank, detergent supply is facilitated through the use of a siphon hose. Given the absence of a soap dilution mechanism, users should dilute detergent correctly before operating the Stihl RB 400 pressure washer. The detergent is automatically mixed with the water flow by the pressure washer when a soap nozzle is connected.
  • Pressure hose: With a set of convenient hooks, the unit provides a convenient way to store the included 25 ft high-pressure hose when not in use, keeping it organized and readily accessible.
  • Spray gun and wand: A side hook allows for an easy storage of the included classic ergonomic spray gun and its wand.
  • Nozzles: Find details on the 5 included nozzles and their recommended surface applications in the table below.


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

Important note: The shapes of the depicted nozzles serve for illustration purposes only and may vary. Symbols used include a red cross for 'Not recommended,' a green check for 'Suitable,' and an orange check for '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 thermal relief valve (which helps to prevent internal pump damage), a trigger lock mechanism (which prevents accidental operation) and a low oil protection.
  • Accessories: Besides the usual owner's manual (opens in a new tab) and documentation to get you promptly started, the Stihl RB 400 comes with oil, wand, spray gun, soap hose and pressure hose.

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, which can achieve a PSI of up to 2700, falls behind the other gas-powered pressure washers in the $825 to $900 price range. Prioritizing the highest water stream power? Check out the Westinghouse WPX4400—a top contender in this price range, delivering up to 4400 PSI.
  • In comparison to devices within the previously mentioned price range, this washer, with its 2.7 GPM, is on the lower spectrum of achievable water flow. If maximum rinsing efficiency is your top priority, one of the devices with the highest water flow in the same price range is the Westinghouse WPX4400, with a GPM of 4.2.
  • The RB 400's Cleaning Units, 7290 CU (PSI X GPM), fall into the lower end when compared to gas-powered devices of similar price. If the highest overall cleaning power is your top priority, the Westinghouse WPX4400, which can reach up to 18480 Cleaning Units, is one of the most efficient of the devices in the current price range.

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

Price comparison

As you can see from these interactive charts, 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
5.2 Total Score
3 reviews
Add your review
Ease Of Use
6.7
Value
3.7
Quality
6
Performance
4.3
3 Reviews
Most Recent Most Helpful Highest Rating Lowest Rating Add your review
  1. Avatar
    Paul m Sabatos August 2, 2022 at 1:01 pm
    1.4
    Ease Of Use
    50
    Value
    20
    Quality
    20
    Performance
    20

    Not happy with performance. Not the stihl quality I’m used to in chain saws . The only thing that’s Stihl is the name all parts are sourced

    + PROS: None over priced’!!!
    - CONS: Wouldn’t recommend it to a friend
    Helpful(4) Unhelpful(0)You have already voted this
  2. 2.9
    Ease Of Use
    100
    Value
    60
    Quality
    60
    Performance
    10

    I bought the 400 last year maybe used it 6 to 7 times it will not hold water pressure zero leaks anywhere what do I need to do to the pump to make it work correctly?

    + PROS: Built well
    - CONS: Doesn’t hold water pressure
    Helpful(2) Unhelpful(0)You have already voted this
  3. 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
    Helpful(2) Unhelpful(0)You have already voted this

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