Review of The Karcher K4 Full Control Pressure Washer

Karcher K4 Pressure Washer Review
  • Performance
  • Comfort
  • Noise
  • Maintenance
  • Ease of Use


Versatile, powerful and very easy to use, the Karcher K4 Full Control Pressure Washer is a great all-rounder machine. The K4 may be a bit expensive, but all the exciting features make it a solid investment for all car and homeowners.

Ever since the invention of the first vacuum cleaner, technology has been making life easier for all homeowners from all corners of the globe. However, people have come to realise that an average vacuum is no match for today’s stubborn breed of dirt and stains. If you live in the UK or any other region with adverse weather, then you know what I’m talking about.

Such areas usually get dirty quickly, and homeowners have to deal with all sorts of messes both in and outside the house. Whether you want to clean out your patio or car, there is only one tool that can get to all those incredibly hard to reach places. Fortunately, the market is now packed with some of the most advanced and powerful pressure washers that don’t mess around with dirt.

Here’s my experience with the Karcher K4 Full Control Pressure Washer.

Karcher K4 Full Control Pressure Washer review

karcher k4 full control pressure washer

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What are you buying?

Boasting of a new update from Karcher, the K4 pressure washer now comes with all new features and a sleek, futuristic design with a black and yellow outer casing. With this bad boy in your cleaning arsenal, customers can now enjoy the best settings for the job. The full control vario and dirt blasters are by far the strongest selling points for the Karcher K4 Full Control Pressure Washer.

This new system by Karcher helps guide people on the correct pressure for the surface being cleaned. There are three different pressure levels that you can choose from. This full control features and capabilities are engineered to give both home and car owners complete confidence to maximize the high pressure from the machine.

For those of you who can’t go without knowing what their brand new machine is capable of, here are some specifications that you should peruse. The Karcher K4 Full Control Pressure Washer incorporates an 1800 Watt motor that works to ensure you get pressure levels as high as 130 bars.

The water flow is also quite reasonable at about 420 litres of high pressured water per hour being used. This means that you can clean an area of 30 square meters in one hour without even breaking a sweat.

Thanks to the clever incorporation of a plug and clean system by Karcher, you spend more time cleaning and less time preparing. In one simple move, you can replace the detergent and put a fresh batch in a matter of seconds. After you set your washer to detergent mode, you can quickly and easily apply it on dirty surfaces. Using soaps by Karcher also improves the cleaning results, especially for stubborn dirt.

I also noticed that once you clean a surface with detergent, it prevents the dirt from returning and also helps protect the surface from contaminants.

Key features summary

  • Size: 58.6 x 39.2 x 35.2 cm
  • Batteries: 2x AAA batteries
  • Power: Corded-electric, 1,800W
  • Flow rate: 420 L/hour
  • Max pressure: 130 bar
  • Hose length: 6m
  • Cord length: 5m
  • Weight: 11.4 Kg

How easy is it to use?

One of the best aspects of updating an already popular machine is that the user friendliness always gets a boost. The Karcher K4 Pressure Washer is incredibly easy to use thanks to all the features that were included precisely for this purpose.

One such feature is a LED display on the trigger that guides users on which pressure to use for the current surface being cleaned. So whether you are cleaning your car or a concrete surface, you always know which pressure levels to go for.

The Karcher K4 Full Control Pressure Washer also boasts of excellent onboard storage for your hoses and lances. In addition to helping keep your work environment organized, the built-in storage makes getting to the accessories very easy and handy. When you are done cleaning, the high impact wheels and an aluminium telescoping handle help you easily transport the machine for simple storage.

Look at this video review:

What accessories are included?

Once you make a purchase, you can expect to find the following items in the box:

  • Karcher K4 Full Control Pressure Washer
  • Vario spray lance
  • Dirt blaster spray lance
  • AAA batteries


  • Improved base stability for easier cleaning.
  • LED display trigger gun for accurate pressure.
  • Convenient onboard storage capabilities.


  • Some customers complain that the storage section for the cables and hose feels a tad flimsy.

Food for thought

While the pressure adjustment settings are a huge advantage for all users, the process is kind of a hit and miss. Sure, you even get a LED display that guides you through the cleaning process, but it may not be as easy as Karcher wants you to believe.

The increased pressure is ideal for stubborn dirt and debris, but users are advised to be as careful as possible when shifting to delicate surfaces. Setting the pressure all the way to max could wreak havoc on your delicate surfaces and even cause damage.


Versatile, powerful and very easy to use, the Karcher K4 Full Control Pressure Washer is a great all-rounder machine. Not only is it perfect for regular cleaning of your car, but it also packs just enough punch to deal with UK’s messy driveways, patios and walls too.

The K4 may be a bit expensive, but all the exciting features make it a solid investment for all car and homeowners. If you are tired of having to scrub down your surfaces until your arms complain, then it’s time to let the Karcher K4 Full Control Pressure Washer lend a helping hand. If you are still undecided, take a look at my other top picks amongst pressure washers here.

Where to buy?

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