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The Karcher K3 is the light, wheel-around machine in the Kärcher home range: 120 bar and 380 litres an hour, a step up from the K2 for anyone who washes a car most weekends and cleans a small patio, bikes and garden furniture. This page lists the kits we stock and the lances, hoses, brushes and foam nozzles that fit them.
Not sure which class you need? 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.
Kärcher pitches the K 3 at light to moderate dirt around the home: cars, bikes and motorbikes, garden furniture, fences and smaller patios. It has a 120 bar top pressure but a lower flow rate than the bigger classes, so it rinses well and suits regular jobs rather than a long, mossy driveway once a year. Its area performance is 25 m² an hour, about 20% more than a K2.
Jobs it handles well:
The big draw is the weight. The eco!Booster version we stock is 4.3kg without accessories, so it's easy to lift into a car boot or up a step, and it wheels round the garden on its telescopic handle. It has an air-cooled motor, which is fine for an hour or so of cleaning at a time. If you clean for long stretches, the water-cooled K4 is built for that.
These figures are from the K 3 eco!Booster listings on our site and match Kärcher's data sheets for this class.
| Spec | K 3 eco!Booster |
|---|---|
| Pressure | 20 to 120 bar |
| Flow rate | 380 l/h max |
| Area performance | 25 m²/h |
| Motor | Air-cooled, 220 to 240V |
| High pressure hose | 6m |
| Power cable | 5m |
| Max water feed temperature | 40°C |
| Weight | 4.3kg without accessories |
| Size (L x W x H) | 242 x 285 x 805mm |
You'll need your own garden hose. Kärcher asks for a fabric-reinforced hose at least 1/2 inch (13mm) across and 7.5m long, which clicks onto the A3/4 adaptor in the box. A water filter on the inlet keeps grit out of the pump.
In the box with the plain machine:
Search for this machine and you'll find a lot of names. They all share the 120 bar, 380 l/h pump. What changes is the body, the gun, the lances and the extras in the box.
The K 3 Classic is the compact one. Kärcher describes it as easy to carry and easy to store, with hose and accessory storage on the body and a suction hose for detergent. It comes with the G 135 Q gun and a Vario Power lance. It suits a flat or a small garden where storage is tight.
The K3 Power Control adds a trigger gun with a small display. You twist the Vario Power spray lance and the gun shows the setting, so you know you're on the soft level for paintwork, or on Mix for detergent. It also works with Kärcher's Home & Garden app, which suggests a setting for each job. Retailer listings for the K3 Power Control show a 7m hose rather than 6m. The older K3 Full Control used a similar Vario lance and the G 120 Q gun, which is still sold as a spare.
The models we stock swap the Vario spray lance for the eco!Booster spray lance, which Kärcher says gives 50% more cleaning performance than a standard flat jet for the same water and power. The dirt blaster lance comes too, for stubborn dirt on stone and concrete.
The surface cleaner is worth having for paving. It cleans flat slabs without the splashback of an open jet, so your legs, walls and windows stay clean. Bigger heads are on our patio cleaner attachments page.
Most of the grid above is accessories. Machines from 2011 on share the same fittings, so most K2 to K7 parts click straight on, but a few are made for one pump class. Check the fit line on each card before you order.
| Class | Max pressure | Flow rate | Area performance | Motor |
|---|---|---|---|---|
| K2 | 110 bar | 360 l/h | 20 m²/h | Air-cooled |
| K3 | 120 bar | 380 l/h | 25 m²/h | Air-cooled |
| K4 | 130 bar | 420 l/h | 30 m²/h | Water-cooled |
The K2 is the cheapest way into the range and fine for a bike and the odd car wash. This one cleans faster and is still light. A Karcher K4 is worth the extra if you have a medium patio to do every spring or clean for an hour or more at a time, because its water-cooled motor runs cooler. For a big driveway, look at the K5.
Prices move often, so here's a rough guide. The plain K3 usually sits between £120 and £150, and the Car & Home kit between £160 and £200. Most accessories here cost £12 to £60, with the telescopic lance kits 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, it's one of the most popular car washers in the range. Turn to a gentle setting, keep the lance about 30cm from the paint and put foam or detergent on first for easier cleaning. The Car & Home kit has the foam jet and wash brush, and our pressure washers for cars page has more tips.
For a small to medium patio, yes, especially with the dirt blaster or a surface cleaner. At 25 m² an hour a big area takes a while, so for a long driveway see our pressure washers for patios and driveways.
Yes, with the Kärcher SH 5 suction hose. Fill the suction hose with water before you switch on, and keep the inlet filter in so grit can't reach the pump.
Most do, as they share the same click-on fittings. The exceptions are pump-specific nozzles: the eco!Booster 120 suits K2 and K3, while the DB 145 dirt blaster is made for K4 and K5. The fit line on each card tells you.
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.
