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The Karcher K7 is the most powerful machine in Kärcher's home range: 180 bar, 550 litres an hour and a water-cooled motor that is built for long sessions on big driveways, patios, render and muddy 4x4s. This page lists the K 7 Comfort Premium and the hoses, lances, brushes and foam nozzles that fit a K7 pressure washer.
Weighing it up against a smaller class? Our K2 vs K3 vs K4 vs K5 vs K7 guide sets them side by side, or browse the whole Karcher pressure washer range. Every item is sold by My Tool Shed.
It's sold for frequent use and heavy dirt. It's the class to pick when you clean a big area often, or when the job is hard going: a long block paved drive, a large stone terrace, mossy walls, a caravan or a muddy van. Its area performance is 60 m² an hour, against 40 m² for a K5 and 30 m² for a K4, so the same drive takes far less time.
Jobs it handles well:
The water-cooled motor is the big reason to buy one. Water running through the motor carries heat away, so it runs cooler, is quieter than an air-cooled motor and is built for a long service life. The aluminium pump adds to that. The trade-off is size: at 18.8kg without accessories it's a lot heavier than a K3, so it rolls round on its wheels and telescopic handle rather than being carried far.
These figures are from the listing on our site and match the data on Kärcher's own K 7 Comfort Premium page.
| Spec | Comfort Premium |
|---|---|
| Pressure | 20 to 180 bar |
| Flow rate | 550 l/h max |
| Area performance | 60 m²/h |
| Motor | Water-cooled, 2.8kW, 230 to 240V |
| High pressure hose | 10m on a hose reel |
| Power cable | 5m |
| Max water feed temperature | 60°C |
| Weight | 18.8kg without accessories |
| Size (L x W x H) | 465 x 354 x 750mm |
In the box:
You supply the garden hose. The maker asks for a fabric-reinforced hose at least 1/2 inch (13mm) across and 7.5m long. The built-in water filter keeps grit out of the pump, so clean it now and then.
Search for this class and you'll find a lot of names. They share the same 180 bar class. What changes is the gun, the lance, the hose and how you set the pressure.
This is the current Karcher K7 Premium model and the one we stock. In January 2026 Kärcher launched the new Comfort range for the K 4 to K 7 classes, which replaced the old Power Control and Smart Control Flex series. The changes are practical ones:
The Comfort Premium Connect version adds an LCD gun with Bluetooth and the eco!Mode setting. All of them work with the Kärcher Home & Garden app for setup and job tips.
The plainer K 7 WCM has the same water-cooled motor and 180 bar but a standard G 180 Q gun, a Vario Power lance and a dirt blaster, with detergent drawn up a suction hose. Some versions come with an eco!Booster lance.
These older models had an LCD gun and a 3-in-1 Multi Jet, and the Smart Control linked to the app over Bluetooth with a boost mode for an extra 15 bar. You'll still see them second hand and in some shops, and the parts below fit them too.
Most of the grid above is add-ons. Home machines from 2011 on share the same Quick Connect fittings, so most K2 to K7 parts click straight on. A few are made for one class, so check the fit line on each card before you order.
A surface cleaner is the one add-on most owners end up buying. On a big drive it cleans evenly and keeps the spray off your legs, walls and car. The heads that fit are on our patio cleaner attachments page.
| Class | Max pressure | Flow rate | Area performance | Motor |
|---|---|---|---|---|
| K4 | 130 bar | 420 l/h | 30 m²/h | Water-cooled |
| K5 | 145 bar | 500 l/h | 40 m²/h | Water-cooled |
| K7 | 180 bar | 550 l/h | 60 m²/h | Water-cooled |
For most homes with a normal drive and patio, a Karcher K5 is enough and costs less. The bigger machine earns its price when the area is big or the dirt is heavy: the extra pressure lifts ingrained moss and lichen, and the extra 50 l/h rinses it away faster. It's also the one to pick if you'd otherwise look at a petrol machine but want mains power. Pick the bigger class if:
For even more grunt, see our most powerful pressure washers or the petrol pressure washers.
Prices change often, so here's a rough guide. The Comfort Premium usually sits between £430 and £500. Most accessories here cost £12 to £55, 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 (retailer's terms apply). Kärcher gives home machines a two year guarantee, or five years if you register it with Kärcher within 28 days. It covers home use only and doesn't cover lances, hoses or other add-ons.
If you clean a large drive, a big patio or several vehicles regularly, yes. It covers half as much again per hour as a K5. For a small patio and a car, the K5 or K4 does the job for less money.
Yes. Use the wide reduced-pressure jet on the Multi Jet, keep the lance about 30cm from the paint and put foam on first. Never use the rotating jet on paintwork, tyres or trim. Our pressure washers for cars page has more tips.
Yes, with Kärcher's 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 lances and nozzles sized for one pump class, so check the fit line on each card.
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.
