Kärcher high-pressure washer K 4 WCM Flex eco!Booster Car & Home, pressure: max. 130 bar, flow rate: 420 l/h, coverage: 30 m²/h, weight: 11.5 kg, high-pressure hose, eco!Booster, Car & Home Kit
About this item
- Everything You Need To Clean Your Car: An accessory kit including Wash Brush, Foam Jet and Natural Car Shampoo helps you clean any vehicle with ease.
- Everything You Need For Outdoor Cleaning: An accessory kit including a T 5 Patio Cleaner and Stone & façade detergent helps you clean large outdoor areas quickly and easily.
- Save Water, Energy and Time: Gain 50% increased cleaning performance* thanks to the efficient yet powerful Eco!booster lance, perfect for use on sensitive surfaces such as wooden decks or cars. *Compared with the Kärcher standard flat jet
- Built To Last: You'll get years of use thanks to the state-of-the-art water cooled motor and 5 year guarantee, built for top performance and durability.
- Everything In One Place: Keep everything you need close to hand with on-board storage for the lances, cable and hose.
- Kärcher Always On Hand: To help you get the job done our specifically designed app is full of useful hints and tips. From setting up the machine to step by step application tips.
Trust score below threshold: too few reviews or negligible discount. Better to look elsewhere.
What we like
- +Versatile Car & Home kit includes dedicated accessories for both tasks
- +Eco!Booster lance increases cleaning efficiency by 50%
- +8m anti-twist hose resists kinks for smooth operation
- +5-year guarantee for long-term peace of mind
- +On-board storage for accessories and cable
To consider
- −Weighs 11.5 kg, which may be heavy for some users to move around
- −Maximum pressure of 130 bar may not be sufficient for heavily ingrained grime
- −Accessories like the patio cleaner could be wider for larger areas
The Kärcher K4 WCM Flex is an excellent choice if you need a single machine for both car and patio cleaning. The bundle includes quality accessories that remove the need for extra purchases, and the eco!Booster technology genuinely saves time and water. At £279.00, a saving of £40.99, this is a sensible Kärcher high-pressure deal for regular home use. The main drawbacks are the weight and lack of wheels, so if you need to move it frequently over uneven ground, consider a lighter model or invest in a trolley. The 130 bar pressure is sufficient for typical domestic tasks like cars, garden furniture, and patios, but heavy commercial use might require a more powerful machine.
Editorial review
The Kärcher high-pressure washer K 4 WCM Flex is a versatile cleaning machine for both your car and outdoor surfaces. With a maximum pressure of 130 bar and a flow rate of 420 litres per hour, it covers up to 30 square metres per hour, making short work of dirt on driveways, patios, and vehicles. The included Car & Home Kit means you get accessories for both tasks right out of the box: a wash brush, foam jet, and natural car shampoo for the car, plus a T 5 patio cleaner and stone and façade detergent for outdoor areas. The eco!Booster lance delivers a 50% boost in cleaning performance compared with a standard flat jet, while using less water and energy. This is a genuine Kärcher high-pressure deal, currently priced at £279.00 saving you £40.99 off the original £319.99. The 8-metre anti-twist hose and Quick Connect system let you start cleaning immediately, and on-board storage keeps everything tidy. With a 4.5-star rating from 87 reviews and a 5-year guarantee, this pressure washer is built to last. The water-cooled motor ensures consistent performance and durability. If you need an efficient, all-in-one solution for maintaining your car and home exteriors, this model offers solid value at the current price.
Price trend
This Kärcher K4 WCM Flex pressure washer is currently on sale for £279.00, down from its usual price of £319.99. That is a genuine 13% saving of £40.99. While not the lowest price ever seen for this model, it represents solid value given the included Car & Home kit and the 5-year guarantee. If you have been waiting for a reasonable discount on a versatile, well-reviewed pressure washer, this is a good moment to buy.
Frequently Asked Questions
Can this pressure washer be used with a water butt?
Yes, the Kärcher K4 WCM Flex can draw water from a static source such as a water butt, but you may need a Kärcher suction hose (sold separately). Ensure the water is clean and free from debris to avoid damaging the pump.
What is the difference between the eco!Booster and the standard lance?
The eco!Booster lance provides approximately 50% more cleaning performance compared with the standard flat jet lance. It uses pressure and water flow more efficiently, allowing you to clean faster and with less water. It is also gentler on sensitive surfaces like wooden decks and car paintwork.
Can I use third-party detergents with this pressure washer?
Yes, you can use third-party detergents as long as they are suitable for high-pressure washers and are compatible with the foam jet accessory. However, to maintain the 5-year guarantee, Kärcher recommends using their own branded detergents and avoiding any that contain solvents, acids, or abrasive agents.
How long is the high-pressure hose?
The high-pressure hose is 8 metres long. It is a PremiumFlex anti-twist hose that resists kinking and tangling, giving you good reach around your car or garden without constant annoying twists.
Does it come with a carry handle or wheels?
No, this model does not have wheels or a telescopic handle. It is a stationary unit weighing 11.5 kg, so you will need to lift and carry it to the cleaning area. The handle is moulded into the top of the machine for carrying.
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