The practical and flexible K4 Compact can be used both horizontally and vertically, is easy to transport and quick to stow away, and provides the full power of a water blaster. In addition, the height-adjustable telescopic handle ensures a convenient pulling height. With its water-cooled motor and an area performance of 30 m2/h, is ideally suited to the occasional cleaning of moderate dirt (small cars, garden fences, bicycles, etc.).
The practical and flexible K4 Compact can be used both horizontally and vertically, is easy to transport and quick to stow away, and provides the full power of a water blaster. In addition, the height-adjustable telescopic handle ensures a convenient pulling height. With its water-cooled motor and an area performance of 30 m2/h, is ideally suited to the occasional cleaning of moderate dirt (small cars, garden fences, bicycles, etc.).
in 3 offers
The lowest price for Kärcher - Pressure Washer K 4 Compact *AU right now is $449.00 at sydneytools.com.au, compared across 3 retailers.
The all-time low was $375.00 on 8 Nov 2024 — today's price is 20% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 6 Oct 2026.
Kärcher - Pressure Washer K 4 Compact *AU
The practical and flexible K4 Compact can be used both horizontally and vertically, is easy to transport and quick to stow away, and provides the full power of a water blaster. In addition, the height-adjustable telescopic handle ensures a convenient pulling height. With its water-cooled motor and an area performance of 30 m2/h, is ideally suited to the occasional cleaning of moderate dirt (small cars, garden fences, bicycles, etc.).
The practical and flexible K4 Compact can be used both horizontally and vertically, is easy to transport and quick to stow away, and provides the full power of a water blaster. In addition, the height-adjustable telescopic handle ensures a convenient pulling height. With its water-cooled motor and an area performance of 30 m2/h, is ideally suited to the occasional cleaning of moderate dirt (small cars, garden fences, bicycles, etc.).
Last updated at 06/10/2026 03:40:38
Karcher K4 Compact (1.637-508.0) 1.9kW 2100PSI Pressure Washer Cleaner
Free delivery
Karcher Pressure Washer Cleaner K4 Compact 1.9kw 2100psi High Pressure
Free delivery
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Karcher K 4 Compact Pressure Washer (1.637-508.0)
Delivery between 8–15 Oct $17.81
originally posted on mitre10.co.nz
I watched and read many reviews and decided a K4 would be a good replacement for my (dead) M300. The water-cooled pump motor promised cool running (the M300 got quite warm) and it gave me significantly more pressure without breaking the bank. The K4 was still expensive and no one offered a discount. I came across the "K4 Compact" on the Mitre 10 site and nowhere else. It is marked as an "exclusive". The price is lower than the regular "K4" and it only omits the pressure control handle and some accessories. If you have no compatible accessories then the regular K4 may be a better buy. Not all Karcher accessories are available in NZ and those that are are expensive.I've used my new blaster for several hours and it performed very well. The pump never sounds like it's ... MoreI watched and read many reviews and decided a K4 would be a good replacement for my (dead) M300. The water-cooled pump motor promised cool running (the M300 got quite warm) and it gave me significantly more pressure without breaking the bank. The K4 was still expensive and no one offered a discount. I came across the "K4 Compact" on the Mitre 10 site and nowhere else. It is marked as an "exclusive". The price is lower than the regular "K4" and it only omits the pressure control handle and some accessories. If you have no compatible accessories then the regular K4 may be a better buy. Not all Karcher accessories are available in NZ and those that are are expensive.I've used my new blaster for several hours and it performed very well. The pump never sounds like it's struggling. I also bought the 10m extension hose. The hose includes a quick-connect adaptor that enabled me to add my old threaded hose. The only annoyance is the ease with which a kink can be put in the Karcher hoses. They're really NOT kink-resistant and they love to remain coiled.
originally posted on mitre10.co.nz
There was much indecision about which water blaster to buy but with the best in-store service and advice I went with the K4 Compact. It's the no frills version of the K4 models but with all the power and performance of it's big, but much more expensive, brother. The K4 Compact is way more than I expected. So easy to use, has amazing cleaning results and the water-cooled motor is a feature that convinced me on this water blaster. It's a small machine with big power performance. In only a couple of hours I restored a large, grimy, concrete area back to new. If you're looking for an affordable no frills but powerful water blaster you can't go wrong with the K4 Compact. It packs a punch. Thanks Nathan for your excellent customer advice.Contrary to a previous review ... MoreThere was much indecision about which water blaster to buy but with the best in-store service and advice I went with the K4 Compact. It's the no frills version of the K4 models but with all the power and performance of it's big, but much more expensive, brother. The K4 Compact is way more than I expected. So easy to use, has amazing cleaning results and the water-cooled motor is a feature that convinced me on this water blaster. It's a small machine with big power performance. In only a couple of hours I restored a large, grimy, concrete area back to new. If you're looking for an affordable no frills but powerful water blaster you can't go wrong with the K4 Compact. It packs a punch. Thanks Nathan for your excellent customer advice.Contrary to a previous review you can see from the photos the K4 pack away neatly simply by winding the hose and power cord around the handle.
originally posted on mitre10.co.nz
Before anything just want to say that Mitre10 team are amazing as they tried to give me all the support.Just bought this and the full power nozzle is just rubbish leaves circles marks EVERYWHERE depending on the surface you're washing especially on timbers... Karcher have should add a WARNING about it which is NOTHING about it in the manual or in box and when I spoke with the Karcher rep he said it's in the manual I mean: REALLY?!?! why lie when is nothing there? Just hope Karcher put this warning soon so others won't have the same problem as I had so yes I'm so REGRETFULLY of purchasing it.
| Pressure (Pounds per square inch) | 2100 |
| Flow rate (Litres per minute) | 7 |
| Area performance (Square metres per hour) | 30 |
| Feed temperature (Celsius) | Maximum 40 |
| Power rating (Kilowatt) | 1.9 |
Karcher K4 Compact (1.637-508.0) 1.9kW 2100PSI Pressure Washer Cleaner
Free delivery
Karcher Pressure Washer Cleaner K4 Compact 1.9kw 2100psi High Pressure
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Karcher K 4 Compact Pressure Washer (1.637-508.0)
Delivery between 8–15 Oct $17.81
I watched and read many reviews and decided a K4 would be a good replacement for my (dead) M300. The water-cooled pump motor promised cool running (the M300 got quite warm) and it gave me significantly more pressure without breaking the bank. The K4 was still expensive and no one offered a discount. I came across the "K4 Compact" on the Mitre 10 site and nowhere else. It is marked as an "exclusive". The price is lower than the regular "K4" and it only omits the pressure control handle and some accessories. If you have no compatible accessories then the regular K4 may be a better buy. Not all Karcher accessories are available in NZ and those that are are expensive.I've used my new blaster for several hours and it performed very well. The pump never sounds like it's ... MoreI watched and read many reviews and decided a K4 would be a good replacement for my (dead) M300. The water-cooled pump motor promised cool running (the M300 got quite warm) and it gave me significantly more pressure without breaking the bank. The K4 was still expensive and no one offered a discount. I came across the "K4 Compact" on the Mitre 10 site and nowhere else. It is marked as an "exclusive". The price is lower than the regular "K4" and it only omits the pressure control handle and some accessories. If you have no compatible accessories then the regular K4 may be a better buy. Not all Karcher accessories are available in NZ and those that are are expensive.I've used my new blaster for several hours and it performed very well. The pump never sounds like it's struggling. I also bought the 10m extension hose. The hose includes a quick-connect adaptor that enabled me to add my old threaded hose. The only annoyance is the ease with which a kink can be put in the Karcher hoses. They're really NOT kink-resistant and they love to remain coiled.
There was much indecision about which water blaster to buy but with the best in-store service and advice I went with the K4 Compact. It's the no frills version of the K4 models but with all the power and performance of it's big, but much more expensive, brother. The K4 Compact is way more than I expected. So easy to use, has amazing cleaning results and the water-cooled motor is a feature that convinced me on this water blaster. It's a small machine with big power performance. In only a couple of hours I restored a large, grimy, concrete area back to new. If you're looking for an affordable no frills but powerful water blaster you can't go wrong with the K4 Compact. It packs a punch. Thanks Nathan for your excellent customer advice.Contrary to a previous review ... MoreThere was much indecision about which water blaster to buy but with the best in-store service and advice I went with the K4 Compact. It's the no frills version of the K4 models but with all the power and performance of it's big, but much more expensive, brother. The K4 Compact is way more than I expected. So easy to use, has amazing cleaning results and the water-cooled motor is a feature that convinced me on this water blaster. It's a small machine with big power performance. In only a couple of hours I restored a large, grimy, concrete area back to new. If you're looking for an affordable no frills but powerful water blaster you can't go wrong with the K4 Compact. It packs a punch. Thanks Nathan for your excellent customer advice.Contrary to a previous review you can see from the photos the K4 pack away neatly simply by winding the hose and power cord around the handle.
Before anything just want to say that Mitre10 team are amazing as they tried to give me all the support.Just bought this and the full power nozzle is just rubbish leaves circles marks EVERYWHERE depending on the surface you're washing especially on timbers... Karcher have should add a WARNING about it which is NOTHING about it in the manual or in box and when I spoke with the Karcher rep he said it's in the manual I mean: REALLY?!?! why lie when is nothing there? Just hope Karcher put this warning soon so others won't have the same problem as I had so yes I'm so REGRETFULLY of purchasing it.
great upgrade from the k3, good pressure noticeably quieter than the old unit I had, being water cooled I can work it hard on all my concrete, driveways and off-roading gear.a bit heavier than the last unit and tends to fall over if I don't pay attention and pull on fully extended hose.The increased pressure and flow rates allow me to fully use my deck/patio cleaner and foam gun where the K3 was always a little lacking on higher water use attachments.would have loved to see a longer hose standard (7.5m MIN) instead of the 6m hose this would have saved me moving the unit around as much.An excellent unit great for someone who uses their pressure washers a fair bit while being economical for the wallet. With a longer hose from factory, I would have given 5 ... Moregreat upgrade from the k3, good pressure noticeably quieter than the old unit I had, being water cooled I can work it hard on all my concrete, driveways and off-roading gear.a bit heavier than the last unit and tends to fall over if I don't pay attention and pull on fully extended hose.The increased pressure and flow rates allow me to fully use my deck/patio cleaner and foam gun where the K3 was always a little lacking on higher water use attachments.would have loved to see a longer hose standard (7.5m MIN) instead of the 6m hose this would have saved me moving the unit around as much.An excellent unit great for someone who uses their pressure washers a fair bit while being economical for the wallet. With a longer hose from factory, I would have given 5 stars.if you are deciding between the k1-3 range and a k4, choose the k4.
The rotary dirt cleaner is awesome at cleaning dirt & moss from cobble stones. The T-Racer circular head is brilliant at cleaning concrete paths and driveways. The adjustable pressure wand is fantastic at washing down all the mess. But when it comes to putting it away, the cord will not wind around the front lipped thingy, because (a) the cord is not made from normal flexible cord, it's made from a stiff plastic cord, and (b) the lipped thingy is not lipped enough and the cord keeps falling off when you wind it on. It's very frustrating, so I end up just winding the cord around the handle. For a tidy kiwi, verging on OCD, it annoys me. It is such a good, compact, grunty blaster that something as simple as this can spoil an otherwise brilliant machine. And as for ... MoreThe rotary dirt cleaner is awesome at cleaning dirt & moss from cobble stones. The T-Racer circular head is brilliant at cleaning concrete paths and driveways. The adjustable pressure wand is fantastic at washing down all the mess. But when it comes to putting it away, the cord will not wind around the front lipped thingy, because (a) the cord is not made from normal flexible cord, it's made from a stiff plastic cord, and (b) the lipped thingy is not lipped enough and the cord keeps falling off when you wind it on. It's very frustrating, so I end up just winding the cord around the handle. For a tidy kiwi, verging on OCD, it annoys me. It is such a good, compact, grunty blaster that something as simple as this can spoil an otherwise brilliant machine. And as for storing the very stiff water pressure tubing. Don't even try wrapping it around the lipped thingy. Just empty the water out of the line, put the plastic caps on the ends, and store it leaning against, or hanging from, a wall.
I bought this back in early December but we finally got the chance to use it in recent weeks. It cleaned down a 12 metre boat with no issue! The lichen is all gone off the fibreglass top and canvas. Zips on the canvas look like new again. Also have washed the car, wheelie bins and size of the house. Overall 100% happy with this purchase. Did my research and M10 were the cheapest around even cheaper than Karcher themselves by $140!
Had a Karcher that never missed a beat over 10 years before it died so decided to buy another one. Bought a new K4 Compact from Bunnings as I was impressed with the water cooling design but how wrong I was. Karcher definitely don’t build them like they used to. I only used it to wash my car once a month for 9 months before it bellowed water from within and no longer held any pressure. Still under warranty right? Sent Karcher an email with all details and pics and still waiting for a reply?Looking at all the online reviews across the Karcher range, I didnt really want a replacement for it to fail again. Steer clear peeps, no longer a reputable company or product.Bunnings however, were fantastic and honored the exchange to another brand almost a year later. Thank you!
Pros: It's light and easy to move. Seems to produce the same amount of power washing that the full size K4 provides.Cons: The provision to wrap cable around the body just doesn't work as the lower moulded end isn't deep enough to prevent the cable from slipping.I haven't used the detergent dispenser yet but having to place the unit flat on the ground with the pipe extended in the detergent bottle must surely mean that you must physically lift it to the next location when washing e.g. around a car or along a patio.
Nice little machine, enough power to wash things around house, cars. Good lance and gun storage, very secure. But as others said, hose can not wind on the machine as photo shows, something is missing to hold the hose in position, maybe design fault. Also, hose is a bit too short, have to move the machine around to wash car, will be much better if comes with at least 7.5m long. No power cable storage as well. All need to put on handles and guns which end up not looking tidy. Other than these it is all good.
My new Karcher K4 Compact Pressure Washer ! First job was to clean my driveway and pathways around my home! Passed with flying colours, windows, and Gutters and facias, and along the eves! Also passed the test! This machine has great pressure, the car is next, along with my carer’s patient disability scooter . I just change my handle to what pressure I need. The biggest plus I found it’s built with heavy duty PVC a great improvement than the many old ones I’ve had! Very easy to use hose length is fine for the work that I do around the house and sheds. Besides if you prefer a longer hose Supercheap have them in stock! The Display of Karcher pressure Washer was the best I’ve seen at Supercheap, it gave me a chart of choice what you want to do , whether it be a ... MoreMy new Karcher K4 Compact Pressure Washer ! First job was to clean my driveway and pathways around my home! Passed with flying colours, windows, and Gutters and facias, and along the eves! Also passed the test! This machine has great pressure, the car is next, along with my carer’s patient disability scooter . I just change my handle to what pressure I need. The biggest plus I found it’s built with heavy duty PVC a great improvement than the many old ones I’ve had! Very easy to use hose length is fine for the work that I do around the house and sheds. Besides if you prefer a longer hose Supercheap have them in stock! The Display of Karcher pressure Washer was the best I’ve seen at Supercheap, it gave me a chart of choice what you want to do , whether it be a driveway or car cleaning and you can just choose from your needs. Sold me! Excellent!
| Pressure (Pounds per square inch) | 2100 |
| Flow rate (Litres per minute) | 7 |
| Area performance (Square metres per hour) | 30 |
| Feed temperature (Celsius) | Maximum 40 |
| Power rating (Kilowatt) | 1.9 |
