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NorthStar 157121 - Spec Breakdown

The NorthStar 157121 is a gas-powered pressure washer offering a maximum water pressure of 3100 PSI and flow of 2.5 GPM. (Read full specs)

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Set an alert for the NorthStar 157121 - Current lowest price: $729.99
Price History
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Price history for the NorthStar 157121
Latest updates:
  • $729.99 - May 14, 2022
  • $779.99 - May 2, 2022
  • $599.99 - May 1, 2022
  • $779.99 - April 26, 2022
  • $759.99 - March 21, 2022
  • $729.99 - March 1, 2022
  • $759.99 - February 3, 2022
  • $699.99 - January 6, 2022
Data source: northerntool.com
Since: January 6, 2022
  • Highest Price: $779.99 - April 26, 2022
  • Lowest Price: $599.99 - May 1, 2022

Features and Specifications

General
FuelGas-Powered
HandlingWheelbarrow
WaterCold (140°F max.)
PSI3100
GPM2.5
Cleaning Units7750
Engine187 cc Honda GC190 OHV 4-stroke
PumpComet DWD Triplex
Features
FrameSteel tubing
Soap injectionVia siphon hose
Soap dilution15:1
Nozzles15°, 25°, 40°, Soap
Quick connect nozzlesYes
Onboard storageYes
Hose25 ft, ⌀5/16
Hose storageHooks
Misc
Dimensions
(L x W x H)
Approx. 40.3 x 26 x 23.8 in
Weight91 lbs
Pressure controlValve
Wheels2 wheels, ⌀10", never flat
Included accessoriesWand, spray gun, high pressure hose, soap hose, 4 nozzles
SecurityLow oil, trigger lock and thermal relief valve
EmissionsCARB, EPA
Warranty10 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

This NorthStar Gas Cold Water Pressure Washer delivers power, durability and reliability in a newly designed compact steel cart featuring new flat-free tires for easy portability and oil drain cutouts for easy maintenance. Great for lawn and garden equipment, heavy-duty machinery, driveways, parking lots, patios, office buildings and much more.

Zoom on the NorthStar 157121

In summary, the NorthStar 157121 is a heavy duty, commercial pressure washer, that offers an all-around versatile cleaning experience, and also:

  • intense cleaning of hard, unpainted surfaces
  • cleaning of painted or delicate surfaces
  • applying detergent and cleaning solutions

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

Power

The NorthStar 157121 in use

The NorthStar 157121

Its triplex pump, which utilizes a 187 cc engine, may deliver a pressure of up to 3100 PSI (almost 52 times more than a standard garden hose) and a flow of up to 2.5 GPM. These values correspond to a cleaning power of 7750 Cleaning Units.

The Honda GC190 engine of this gas-powered pressure washer gets started by a classic pull-start mechanism.

Gasoline is stored in a steel fuel tank with a maximum capacity of 0.53 gallon.

Design & Handling

The wheelbarrow design of the NorthStar 157121 grants mobility and stability to the unit. The robust steel tubing frame guarantees longevity of the assembly. The handle adds to the 157121 convenience of transport.

The device weighs 91 lbs and thus, is far from lightweight. Transporting and manually lifting it may therefore pose a challenge. The main contributors to its weight are its 187 cc Honda GC190 engine, the triplex pump and steel tubing frame. However, the unit is mobile thanks to its two 10" never-flat wheels, which add to its movability and allow it to be manipulated smoothly on the job.

Main Features

The NorthStar 157121 in use

The NorthStar 157121

Along with the NorthStar 157121 itself, the package also includes a spray gun, a wand, a pressure hose, 4 nozzles and a detergent injection feature, which are discussed in further detail below.

  • Soap injection: Detergent is fed in through a siphon hose, since the device lacks a soap tank. The NorthStar 157121 has an automatic soap dilution mechanism, which dilutes the detergent using a 15:1 ratio. Whenever a soap nozzle is connected, the detergent is automatically added to the water.
  • Pressure hose: The included 25 ft ⌀5/16" high-pressure hose can be neatly stored on the unit when idle thanks to 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 following table illustrates the 4 included nozzles, along with the surfaces which they are the most suitable for.
 

15°

25°

40°

Soap
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

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

Some of the accessories of the NorthStar 157121

Some of the included accessories

  • Onboard storage: The NorthStar 157121 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 trigger lock mechanism (which prevents accidental operation), a thermal relief valve (which helps to prevent internal pump damage) and a low oil protection.
  • Accessories: Included with the NorthStar 157121 are also the owner's manual (opens in a new tab) and some basic documentation to get you promptly started, along with several accessories, such as wand, soap hose, pressure hose and spray gun.
  • Emissions: The NorthStar 157121 is EPA-approved and CARB-compliant. And so, this pressure washer is available for sale and purchase in any of the 50 states, including California.

Product Video

The NorthStar 157121's performance versus other pressure washers

The following charts are provided to give you an idea of how the key specs of the NorthStar 157121 compare to similarly priced pressure washers.

  • The NorthStar 157121 with its 3100 PSI achieves a lower pressure value, compared to other gas-powered pressure washers in the $675-800 price range. If the highest possible power of the water stream is your priority, one of the champions in this price range is the A-iPower PWF4200SH with 4200 PSI.
  • This washer, with a GPM of 2.5 (gallons per minute) has a somewhat lower water flow value compared to devices in its price range. If rinsing away debris most efficiently is your priority, one of the devices with the highest GPM in this price range is the A-iPower PWF4200SH, which can reach up to 4 GPM.
  • With 7750 Cleaning Units (PSI X GPM), the 157121 is on the low end when compared to other similarly priced gas-powered devices. If you are after the highest overall cleaning power, the A-iPower PWF4200SH with its 16800 Cleaning Units is one of the products that can achieve the highest cleaning efficiency in this price range.

Price comparison

As you can see from this interactive chart, when compared to other gas-powered washers between 7500 and 8000 Cleaning Units, the NorthStar 157121 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
  • Honda engine
  • Designed to be stable
  • Good range of nozzles included
  • Automatic detergent dilution
  • Onboard storage
  • Several security features
  • CARB-compliant
  • 10 year (limited) warranty
WEAKNESSES:
  • On the expensive side
  • No soap tank
  • Low PSI for the price
  • Low GPM for the price
  • Low CU for the price

Do you own the NorthStar 157121 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

About NorthStar

The NorthStar brand of outdoor power equipment is owned and distributed by the Northern Tool company, which was founded in 1981 in Minnesota, USA. The brand includes log splitters, generators, pressure washers, and air compressors. Though many of the components are manufactured in Northern Tool’s factory in China, NorthStar pressure washers are engineered, assembled, and tested in America, and powered by Honda engines. They include hot water, cold water, and soft-wash systems, along with many accessories. NorthStar brand products make up a large percentage of Northern Tool's product line.

Warranty Information

The NorthStar 157121 is covered under a warranty for up to 10 years. This warranty may be limited and may not cover all parts of the unit.
For more information about the warranty of NorthStar pressure washers, please contact the NorthStar Customer Support: 1-800-270-0810.

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