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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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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), 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
EmissionsUnknown
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 or high reach areas
  • intense cleaning of hard, unpainted surfaces
  • cleaning of painted and fragile surfaces
  • use of detergent and cleaning solutions

Its power characteristics and design, its main features and all its additional features are presented ahead.

Power

The Stihl RB 400 in use

The Stihl RB 400

The Stihl RB 400's axial pump, powered by a 196cc (6.5 hp) engine, can provide a pressure of up to 2700 PSI (approximately 45 times more than a standard garden hose) and a flow of up to 2.7 GPM (values claimed by the manufacturer). The Stihl RB 400 thus has a cleaning power of 7290 Cleaning Units.

A classic pull-start mechanism is responsible for starting the gas-powered pressure washer’s Kohler SH265 engine.

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

Design & Handling

With its hand truck design and approximate dimensions of D28.5 x W27.5 x H39.5 in, the Stihl RB 400 provides great mobility. 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 196cc Kohler SH265 engine and steel tubing frame. However, the unit is mobile thanks to its two pneumatic wheels, which add to its movability and allow it to be manipulated smoothly on the job.

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: Even though the device doesn't have a soap tank, detergent is supplied 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. Whenever a soap nozzle is connected, the detergent is automatically added to the water.
  • Pressure hose: The included 25 ft high-pressure hose can be neatly stored on the unit when idle thanks to a set of convenient hooks.
  • Spray gun and wand: The included classic ergonomic spray gun and its wand can be easily stored in a side hook.
  • 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: The Stihl RB 400 features a handy storage area, which allows you to neatly store nozzles and accessories and be always prepared by having everything needed at hand.
  • 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 wand, soap hose, pressure hose, spray gun and oil.

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 with its 2700 PSI achieves a lower pressure value, compared to other gas-powered pressure washers in the $825-900 price range. If the highest possible power of the water stream is your priority, one of the champions in this price range is the Simpson PS60843 with 4400 PSI.
  • In the aforementioned price range, this washer, with 2.7 GPM (gallons per minute), is placed on the lower end of the GPM scale. If you’re after the highest rinsing efficiency, one of the units with the highest water flow in the current price range is the Westinghouse WPX4400, that can deliver up to 4.2 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 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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