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Karcher 8/18-4 M St High Pressure Washer

Karcher 8/18-4 M St High Pressure Washer middle-class pump unit with robust 3-piston axial pump with brass cylinder head and 4-pole slow-running three-phase motor. Suitable for horizontal and vertical operation.

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The powerful Karcher 8/18-4 M St High Pressure Washer motor/pump unit with robust 3-piston axial pump and brass cylinder head, 4-pole slow-running three-phase motor and pressure switch control impresses with up to 20% higher energy efficiency and cleaning performance. The stationary middle-class machine is designed both for vertical and horizontal use. The 3-point support on the back of the machine enables vertical wall mounting as well as horizontal installation. Easy access to the high-pressure pump, which is protected by a large water filter, and to the electronic components, is proof of the extremely maintenance-friendly machine design. Using the Servo Control function, the water volume and working pressure can be varied by selecting the corresponding nozzles. All high-pressure components are protected from loads in stand-by operation by the reliable automatic pressure relief feature.


Technical data

Current type (Ph/V/Hz) 3 / 400 / 50
Flow rate (l/h) 760
Working pressure (bar/MPa) 30 – 180 / 3 – 18
Max. pressure (bar/MPa) 270 / 27
Connection load (kW) 4,6
Power cable (m) 5
Weight (kg) 36
Dimensions (L × W × H) (mm) 290 x 300 x 565


  • Pressure cut-off
  • Servo Control

Features & Benefits


High-quality equipment

  • Automatic pressure relief for protecting the components extends their service life. Powerful, 4-pole slow-running electric motor. High-quality brass cylinder head.

Flexible operation

  • Designed for upright and horizontal operation.

Prepared for stationary operation

  • Simple and robust 3-point attachment for wall mounting on the rear of unit.
  • Space-saving, compact design.
  • Robust plastic chassis reliably protects the pump against damage and dirt.

Easy servicing

  • Easy access to the cylinder head when bottom of machine is opened.
  • Fast access to electrical box through simple removal of cover.
  • Large, easy-to-reach water fine filter for protecting the pump against dirt particles in the water.

Increased energy efficiency

  • Newly developed 3-piston axial pump with considerably reduced flow and pressure losses.
  • 20 percent increase in cleaning performance and energy efficiency.

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