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The Karcher K4 is the mid-size machine in the Kärcher home range: 130 bar, 420 litres an hour and a water-cooled motor, so it suits a family car, a medium patio and garden furniture without the weight or price of a K5. This page lists the kits we stock and the lances, hoses, brushes and foam nozzles that fit them.
Torn between classes? Our K2 vs K3 vs K4 vs K5 vs K7 guide sets them side by side, or see the whole Karcher pressure washer range. Every item is sold by My Tool Shed.
It sits in the middle of Kärcher's home K range. It has enough pressure and flow rate for moss in patio joints and a muddy car, but it's still light enough to wheel round a normal garden on its telescopic handle. Kärcher rates it for "moderate dirt" and an area performance of 30 m² an hour, about half as much again as a K2.
Its big selling point is the water-cooled motor. The water passing through the pump also cools the 1.8kW motor, so it runs cooler on long jobs and tends to last longer than the air-cooled motors on the K2 and K3. Expert Reviews called the K4 Power Control the best all-round pressure washer for most people, and the same 130 bar platform is in every version.
These figures are from the WCM Flex listings on our site and match Kärcher's own data sheets.
| Spec | K 4 WCM Flex |
|---|---|
| Pressure | 20 to 130 bar |
| Flow rate | 420 l/h max |
| Area performance | 30 m²/h |
| Motor | Water-cooled, 1.8kW, 230 to 240V |
| High pressure hose | 8m PremiumFlex, Quick Connect |
| Power cable | 5m |
| Max water feed temperature | 40°C |
| Weight | 11.8kg without accessories |
| Size (L x W x H) | 369 x 329 x 901mm |
It connects to a normal garden hose through the A3/4 adaptor and has a water filter on the inlet to keep grit out of the pump.
Kärcher sells this class in several versions and bundles, which is why a search throws up so many names. They share the 130 bar and 420 l/h pump. What changes is the body, the gun and what comes in the box.
The K 4 Classic is the compact one, with a much lighter body you carry by its handle. It's a good choice if storage space is tight and you clean a car and a small patio rather than a long driveway.
The K 4 Power Control Flex has the G 160 Q Power Control trigger gun with a small LED display. You twist the Vario Power spray lance until the Power Control gun shows the right level: soft, medium, hard or a Mix setting for detergent. Kärcher's Plug 'n' Clean system then takes detergent straight from a bottle that clicks into the machine. It also links to the Home & Garden app, which suggests the right setting for each job. If you want the app and the display, the K4 Power Control is the one to look for. The K 4 Power Control Flex replaced the Full Control, which used a similar trigger gun and Vario Power idea with a 6m hose rather than 8m.
The WCM Flex models we stock pair the WCM motor with the PremiumFlex hose, which stays supple and lies flat instead of kinking. Instead of the Vario Power spray lance and Power Control gun, they come with the eco!Booster lance, which Kärcher says gives 50% more cleaning performance than a standard flat jet on the same water and power.
The surface cleaner is worth having. It cleans flat paving without the splashback you get from an open jet, so your legs, walls and windows stay clean. More options are on our patio cleaner attachments page.
Most of the grid above is Karcher K4 accessories. Current machines use Quick Connect, so most K2 to K7 accessories click straight on, but a few are made for one class. Check the fit line on each card before you order.
A Karcher K3 gives 120 bar and 380 l/h with an air-cooled motor. It's lighter and cheaper, fine for small jobs. Step up to a Karcher K5 for 145 bar, 500 l/h and about 40 m² an hour if you've got a large driveway or a caravan. For most homes, the middle class is the sweet spot, and it's the cheapest Kärcher with water cooling.
Prices move often, so here's a rough guide. The plain kits usually sit between £200 and £240, and Car & Home bundles between £270 and £320. Most accessories here cost £12 to £60, with the telescopic lance kits at about £100 to £130. Any with a real saving today show on our pressure washer deals page.
My Tool Shed usually delivers on the next working day and takes unused items back within 30 days. Kärcher gives home machines a two year guarantee, or five years if you register the pressure washer with Kärcher within 28 days of buying.
Yes. Turn the spray lance to its softest setting, keep it about 30cm from the paint and apply detergent or foam first. The Car & Home kit has the foam jet and wash brush, and our pressure washers for cars page has more tips.
Yes, with the Kärcher SH 5 suction hose. Fill the suction hose with water before you switch on, and use the inlet filter so grit can't reach the pump.
Only the Home and Car & Home kits come with the T 5 surface cleaner. The plain machine has two lances, so add a patio cleaner separately if you need one.
The current Power Control and WCM Flex machines have an 8m high pressure hose. Add a 6m extension or swap to a 10m one for more reach around the house.
A blocked inlet filter, a kinked hose, a worn nozzle or air in the pump are the usual causes. Our Karcher pressure washer not working guide goes through each fix and the parts you might need.
