The Kärcher HDS 10/21-4 M is one of the most powerful machines in Kärcher’s middle-class hot water pressure washer range, designed for demanding professional cleaning applications where performance, efficiency, and reliability are essential. Combining high cleaning power with advanced ergonomics and economical operation, it is ideal for industrial, agricultural, transport, and commercial cleaning environments.

Exceptional Cleaning Performance

Delivering up to 210 bar working pressure and an impressive water flow rate of up to 16l/min, the HDS 10/21-4 M easily removes stubborn grease, oil, mud, and heavy contamination from vehicles, machinery, production areas, and industrial surfaces. The powerful hot water system significantly improves cleaning efficiency while reducing detergent usage.

Durable 4-Pole Water-Cooled Motor

At the heart of the machine is a low-speed 4-pole water-cooled electric motor, combined with a robust 3-piston axial pump with ceramic pistons. This high-quality setup ensures excellent durability, low wear, and reliable long-term operation under continuous professional use.

eco!efficiency Mode for Lower Running Costs

Kärcher’s innovative eco!efficiency mode allows the machine to operate in the most economical temperature range of 60°C while maintaining full water flow. This reduces fuel consumption and operating costs without compromising everyday cleaning performance.

EASY!Force Advanced & EASY!Lock System

The machine is equipped with Kärcher’s advanced EASY!Force Advanced trigger gun, reducing operator fatigue during extended cleaning tasks. Combined with the EASY!Lock quick-connect system, setup and accessory changes are significantly faster and more convenient than traditional threaded fittings.

Advanced Ergonomics & User-Friendly Design

The HDS 10/21-4 M features a highly practical mobility concept with large wheels, ergonomic handles, and integrated storage compartments for accessories. Two integrated detergent tanks allow quick switching between cleaning agents for different applications.

Built for Daily Professional Use

A range of integrated safety and protection systems help maximise service life and reliability, including:

• SDS vibration damping system
• Water softening system
• Integrated fuel, detergent, and descaler tanks
• Pressure cut-off system
• Optimised burner engineering for efficient heating performance

Key Features

• Genuine Kärcher part: 1.071-939.0
• 210 bar working pressure
• Max pressure: 250 bar
• Water flow rate: 500–1000 l/h
• Hot water and steam cleaning capability
• Durable 4-pole water-cooled motor
• Robust 3-piston axial pump with ceramic pistons
• eco!efficiency mode for reduced fuel consumption
• EASY!Force Advanced trigger gun
• EASY!Lock quick-connect system
• Twin detergent tanks (20L + 10L)
• ANTI!Twist hose system
• Power supply: 400V 3-phase

Ideal For

• Industrial and manufacturing facilities
• Agriculture and heavy machinery cleaning
• Vehicle and transport fleet washing
• Construction and plant equipment
• Commercial and contract cleaning applications

• Specification	Value
  Number of current phases (Ph)	3
  Voltage (V)	400
  Frequency (Hz)	50
  Flow rate (l/h)	500 – 1000
  Working pressure (bar/MPa)	30 – 210 / 3 – 21
  Temperature (for supply 12 °C) (°C)	min. 80 – max. 155
  Connected load (kW)	8
  Consumption of fuel oil at full load (kg/h)	7,3
  Consumption of heating oil in eco!efficiency mode (kg/h)	5,8
  Power cable (m)	5
  Fuel tank (l)	25
  Weight (with accessories) (kg)	160,2
  Weight incl. packaging (kg)	170,1
  Dimensions (L × W × H) (mm)	1330 x 750 x 1060