Powerhorse 115178 - 3800 PSI 3.6 GPM 274cc Gas Pressure Washer

The Powerhorse 115178 is a gas-powered pressure washer offering a maximum water pressure of 3800 PSI and flow of 3.6 GPM. (Read full specs)

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Features and Specifications

WaterCold (104°F max.)
Cleaning Units13680
Engine274cc OHV 4-stroke
FrameSteel tubing
Soap injectionYes
Soap tankYes
Soap dilution15:1
Nozzles15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose35 ft, ⌀3/8
Hose storageHooks
(L x W x H)
Approx. 34 x 21 x 28 in
Weight120 lbs
Wheels2 wheels, ⌀10", pneumatic
Included accessoriesWand, spray gun, high pressure hose, 4 nozzles
SecurityLow oil, trigger lock and thermal relief valve
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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Zoom on the Powerhorse 115178

In summary, the Powerhorse 115178 is a heavy duty, commercial pressure washer, that offers an all-around versatile cleaning experience, and also:

  • complete cleaning of hard surfaces, vehicle washing, and surface prep for painting
  • gentle cleaning of delicate surfaces, and low pressure cleaning of larger areas
  • applying detergents or chemicals, and rinsing surfaces afterward

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


Fueled by a powerful 274cc engine, its triplex pump can generate a forceful pressure of 3800 PSI (roughly 63 times that of a standard garden hose) and a flow rate of up to 3.6 GPM (values claimed by the manufacturer). When these values are taken together, they yield a cleaning power of 13680 Cleaning Units.

To initiate the engine of this gas-powered pressure washer, a traditional pull-start mechanism is employed.

Fuel for the pressure washer is housed in a tank capable of holding up to 1.32 gallon of gasoline.

Design & Handling

With its wheelbarrow-inspired design, the Powerhorse 115178 aims for excellent mobility and stability, enabling effortless maneuvering and dependable performance across diverse environments. Guaranteeing longevity, the robust steel tubing frame offers stability and protects internal components, even when subjected to demanding tasks. The reversible handle offers further versatility, as its different positions make the unit less bulky when stored.

With its weight clocking in at 120 lbs, this unit's heftiness can't be ignored, presenting significant difficulties for users who need to lift and transport it, especially over uneven terrain. Its 274cc engine, the triplex pump and steel tubing frame are mainly responsible for its heavy weight. Despite this, the presence of two 10" pneumatic wheels reduces the complexity of moving the 115178, even on rugged surfaces.

Main Features

The Powerhorse 115178's package includes a spray gun, a wand, a pressure hose, 4 nozzles and a detergent injection feature, with a more detailed description below.

  • Soap injection: Detergent storage is ensured by a dedicated tank. With its automatic soap dilution mechanism, the Powerhorse 115178 simplifies the process of blending detergent to the prescribed ratio of 15:1. Once a soap nozzle is connected, the pressure washer automatically blends the detergent with the water flow.
  • Pressure hose: For easy organization, the included 35 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: A side hook enables you to easily store the included classic ergonomic spray gun and its wand.
  • Nozzles: Below, you'll find a table outlining the 4 included nozzles and their recommended surfaces.




Concrete, brick, masonrySuitableSuitableSuitableSuitable
Siding, gutters, houseUse with cautionUse with cautionSuitableSuitable
Fencing, deck, patioUse with cautionUse with cautionSuitableSuitable
Lawn equipment, boat, RVUse 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 Powerhorse 115178

The Powerhorse 115178

  • Onboard storage: The Powerhorse 115178's handy storage area lets you store nozzles and accessories, and thus, you’ll be always prepared and have everything necessary for the job at hand.
  • Safety: Safety of operation is enhanced by a thermal relief valve (which helps to prevent internal pump damage), a low oil protection 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 Powerhorse 115178 also comes with wand, pressure hose and spray gun.

The Powerhorse 115178's performance versus other pressure washers

The following charts are provided to give you an idea of how the key specs of the Powerhorse 115178 compare to similarly priced pressure washers.

  • Delivering a maximum pressure of 3800 PSI, the Powerhorse 115178 is one of the gas-powered products renowned for providing the highest water pressure output, in the $600 to $700 price range.
  • The water flow of this washer, which reaches up to 3.6 GPM (gallons per minute) is one of the highest values found in the above-mentioned price range.
  • Reaching up to 13680 Cleaning Units (PSI X GPM), the 115178 is one of the most efficient amongst its similarly priced peers.

Price comparison

As you can see from these interactive charts, when compared to other gas-powered washers between 13500 and 14000 Cleaning Units, the Powerhorse 115178 is on the cheap side of the price range.

It can therefore be a really good buy if you're looking to acquire a budget pressure washer.

The bottom line

  • Inexpensive
  • Triplex pump
  • Designed to be stable
  • Good range of nozzles included
  • Automatic detergent dilution
  • Onboard storage
  • Several security features
  • High PSI for the price
  • High GPM for the price
  • High CU for the price
  • The Powerhorse 115178 doesn't have any notably low specs.

Do you own the Powerhorse 115178 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

About Powerhorse

The Powerhorse outdoor power products brand offers a range of gas- and electric-powered tools including pressure washers, log splitters, wood chippers/shredders, and electric generators. Also available are engines and water pumps. With a motto of "Power You Can Depend On", Powerhorse is a trademarked brand name that is distributed exclusively by the Northern Tool & Equipment Company Inc.

Warranty Information

The Powerhorse 115178 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 Powerhorse pressure washers, please contact the Powerhorse Customer Support: 1-866-443-2576.

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