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Karcher HD 9/20-4 Classic High Pressure Washer


Most powerful high-pressure cleaner of the HD Classic Range: the Karcher HD 9/20-4 Classic High Pressure Washer with 900 l/h water flow, three-phase drive and crankshaft pump with ceramic piston. For long service intervals.


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The Karcher HD 9/20-4 Classic High Pressure Washer is the most high-performance model in the HD Classic range. The machine operates with three-phase current, features an impressive 900 l/h water flow, and is synonymous with high durability. All components are designed for continuous use. The intuitive operation, compact dimensions and low weight guarantee comfortable handling. The high-pressure cleaner offers ample onboard storage for the nozzle, lance and other accessories. The HD 9/20-4 Classic is also impressive in terms of efficiency: reduced cleaning times ensure a plus for profit. Service-friendliness is an additional bonus. The machine features easy access to all relevant machines parts.


Technical data

Current type (Ph/V/Hz) 3 / 400 / 50
Flow rate (l/h) 520 – 900
Working pressure (bar/MPa) 70 – 200 / 7 – 20
Max. pressure (bar) 240
Connection load (kW) 6.9
Weight (kg) 56
Dimensions (L × W × H) (mm) 709 x 469 x 1000


  • Spray gun, standard
  • High-pressure hose, 10 m
  • Spray lance, 600 mm
  • Power nozzle
  • Anti-twist system (AVS)
  • Pressure cut-off
  • Crankshaft pump with ceramic pistons

Features & Benefits

Durable and robust

  • Extra large crankshafts and connecting rods with robust ball bearings.
  • Ceramic pistons for reduced wear and tear.
  • High performance sealing packages for longer working times.

Especially easy to maintain

  • Wide-opening machine cover for easy access to all service and maintenance-relevant components.
  • Large water fine filter for optimal protection of the pump.
  • Integrated nozzle storage.

Improved cleaning performance

  • Patented Kärcher power flat jet nozzles: up to 40 percent more impact force than conventional nozzles.
  • High area coverage and thorough dirt removal.

Excellent mobility

  • Large wheels and ergonomic push handle ensure optimal turning manoeuvrability and easy handling.
  • The foldable push handle enables space-saving storage.

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