Kärcher K4 Full Control Pressure Washer Review

Kärcher K4 Full Control Pressure Washer - Review
Kärcher K4 Full Control Pressure Washer
What I Like
LED power display.
Parking bracket for the spray lance.
Water-cooled motor.
Long, 6-metre hose.
What I Don't Like
Heavier than some (but has wheels for easy transportation).
The detergent slot must use a bespoke Kärcher bottle.
My Overall Rating

Kärcher K4 Full Control Pressure Washer Review


Kacher K4 Pressure Washer Review

The Kärcher K4 Full Control Pressure Washer has an adjustable pressure between 20 to 130 bar and is supplied with a Vario and Dirt Blaster spray lance. It has a trolley design with wheels and a telescopic handle for easy transportation and storage. The Kärcher K4 has a flow rate of 420 (max), and is supplied with a 6 metre pressure hose.

Karcher’s K4 is a medium-size pressure washer suitable for cars, terraces, and fences. The high flow rate combined with increased pressure provides the target with a deep clean. And the high level of control means that you can perform the best cleaning without cutting into the surface.

Main Features

  • Pressure (bar): 20 – 130
  • Flow Rate (l/h): 420
  • Noise at Operator: 75 dB
  • Power Rating (watts): 1800, 7.5 Amps
  • Area Performance (m²/h): 30
  • Weight (kg): 11.4 Net / 12.8 Gross
  • Dimensions – L x W x H (mm): 397 × 305 × 584


The weight of this pressure washer is under 12 kilograms, and closer to 13 kilograms when you start to add accessories. There are wheels, a telescopic handle, and another sturdy carry-handle at the base to make lifting it easier.

Power / Bar Pressure

The K4 uses a powerful 1800-watt motor that draws 7.5 amps, producing up to 130-bar at the nozzle end. Perfect for getting deep into garden tools and wheel hubs. You can even spread the jet out to clean greater areas at a time.

Kärcher K4 Full Control Pressure Washer Video

Hose Flow Rate

Kacher K4 Pressure Washer Flow Rate An impressive 7 litres of water per minute, will flow through the washer at peak performance — when fed from a regular garden hose. You can also add up to 0.3 litres per minute of detergent into the flow. This gives the operator enough flow rate to wash larger flat areas, such as driveways, using Kärcher’s rotating surface cleaner. Check Today's Price



A larger motor will make more noise, and the 1800-watt motor will produce up to 90 decibels at the unit. Though a 6-metre pressure hose means that the operator can stand a good distance from the unit, mitigating the noise down to 75 decibels. The motor is also water-cooled, which will extend its lifespan.

Accessories and Use

The basic K4 package comes with a range of accessories, so that you can begin cleaning, the moment you plug it in:

  • The Kärcher detergent bottle that plugs into the K4.
  • A trigger gun with LED read-out to show the pressure you are running at.
  • A telescopic handle with two wheels for ease of transport.
  • The Dirt Blaster and Vario Power spray lances.
  • A removable water filter to protect the pump.
  • A garden hose adaptor.

Practicalities and Design

Kacher K4 Pressure Washer Practicalities The wheels and telescopic handle, and the large carry handle makes a big difference when it comes to moving the machine around. A slot for the detergent bottle to soap up a car keeps the unit tidy. And the LED display is going to help prevent those unfortunate incidents of using full power on your car’s paintwork.

Kärcher K4 Full Control Pressure Washer User Manual

Click Here for the Kärcher K4 Full Control Pressure Washer User manual

Pros & Cons

  • LED power display.
  • Parking bracket for the spray lance.
  • Water-cooled motor.
  • Long, 6-metre hose.
  • Heavier than some (but has wheels for easy transportation).
  • The detergent slot must use a bespoke Kärcher bottle.


Whats Included in the Box?

  • 1 x Karcher K4 Full Control Pressure Washer
  • 1 x Vario spray lance
  • 1 x Dirt Blaster spray lance
  • 2 x AAA Batteries

Should You Buy This Model?

Kacher K4 Pressure Washer Conclusion

You do not get that many accessories with the washer, but the K4 makes up for it in power. This pressure washer has everything that you need to wash a car, pathway, or to blast away thick mud from a garden tool.


The pressure and flow rate are both high, meaning that you can do some serious cleaning with some of Karcher’s other accessories. Though, regular users trying to clean large floor areas may find that it is taking too long. For normal use, cleaning vehicles and garden maintenance, this is more than enough machine to do the job.

Where should I purchase this Kärcher K4?

Kärcher K4 Full Control Pressure Washer
  • LED display trigger gun
  • Extendable handle making transportation of your pressure washer simple
  • The high-pressure hose is stored at the back of the unit, making it easy to set up and store away
  • 3 years manufacturer's warranty
  • Flow rate (l/h) - max. 420 . Max. water feed temperature (°C) - max. 40
  • CUSTOMER CARE NUMBER - 01295 234020

Last update on 2023-12-03 / Affiliate links / Images from Amazon Product Advertising API

Check Today's Price


Not sure about this Pressure Washer? Click here for more Pressure Washer reviews. 


How long is the hose on the Karcher K4 Full Controll pressure washer?

6 metres.

What is the difference between Karcher K2 and K4?

K4 is a more powerful model, is supplied with LED trigger gun (batteries supplied) making it easier to decide what setting to choose for what task, K4 also has a longer hose.

What lances are supplied with the Karcher K4 Full Control?

Vario Spray Lance and Dirt Blaster Spray Lance.

Does the Karcher K4 come with a water filter?

No, but can be purchased separately.

Is the Karcher K4 supplied with a foam jet nozzle?

The Karcher K4 can be purchased with the foam jet nozzle or is an optional extra.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

DMCA.com Protection Status

As an Amazon Associate I earn from qualifying purchases.

EasyLawnMowing.co.uk is a participant in the Amazon Services LLC Associates Program,
an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com, amazon.co.uk, amazon.ca
and any other website that may be affiliated with Amazon Service LLC Associates Program.

Scroll to Top