Kärcher K4 Power Control
Our verdict · The best all-rounder for most homeowners: enough power for drives and patios, a water-cooled motor, and per-surface pressure control that helps protect delicate surfaces like car paint and decking.
Buy it if
You have a mix of jobs — car, patio, decking and a block-paved drive — and want one machine you can trust to last several seasons.
Skip it if
Your jobs are genuinely light and occasional, or you have no outdoor mains tap and power, where a cheaper K2 or a cordless unit makes more sense.
Where to get it
Kärcher K4 Power Control
From ~£200
Indicative price at the time of review.
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The K4 is repeatedly named the overall top pick across independent UK testers, and it earns it by getting the fundamentals right rather than chasing headline numbers. Kärcher's own specification puts it at 130 bar and 420 l/h from an 1800W water-cooled motor. Its Power Control system lets you select the surface (car, wood, stone, concrete) on a dial at the lance so it sets a safe pressure, which reviewers describe as making it almost impossible to strip paintwork, decking or soft stone. You pay a premium over the Bosch below and it needs a mains tap and outdoor power, but for a well-supported all-rounder the surface safety and Power Control are what tip it to number one. Indicative pricing is around £200, though it swings either side of that with seasonal promotions, so it is worth comparing retailers before you buy.
The good & the bad
Pros
- Water-cooled motor, per Kärcher's own specification
- Power Control dial sets a safe pressure per surface, reducing the risk of damage to paint or decking
- Widely stocked with strong brand parts and warranty support
Cons
- Noticeably pricier than the Bosch 135, which edges it on raw output
- No patio surface-cleaner head included in the box
How it compares
| Pick | WATTB Score | Price | Best for |
|---|---|---|---|
| 1.Kärcher K4 Power ControlThis pick | 88/100 | From ~£200 (indicative) | overall |
| 2.Bosch UniversalAquatak 135 | 84/100 | ~£109-135 (indicative, RRP £199.99) | value |
| 3.Nilfisk Core 140-8 PowerControl | 84/100 | From ~£190 (indicative; Core 140-6 £189.99, was £199.99) | heavy-duty patios and driveways |
| 4.Kärcher K2 (Power Control / Universal) | 74/100 | ~£90-119 (indicative, commonly ~£100) | budget and entry pick |
| 5.Worx Nitro HydroShot WG633E (20V) | 70/100 | ~£112 (indicative, bare tool: £111.99, was £139.99, at Screwfix) | cordless and portable |
Key facts
- Best for
- overall
- Typical cost
- From ~£200 (indicative)
- Max pressure
- 130 bar
- Flow rate
- 420 l/h
- Motor
- 1800W water-cooled
- Pressure control
- Power Control dial at the lance
- Included lances
- Power Control gun, Vario Power + dirt blaster
Researched by WATTB
- Published
- 19 September 2026
- Updated
- 19 September 2026
- Last verified
- 19 September 2026
- Sources
- 12 sources
We research and rank options from public data, official information and published reviews. How we research →
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