Karcher HD 10/21-4 St 250Bar Stationary Cold Water Pressure Washer 1.524-963.0

The Kärcher HD 10/21-4 ST is a powerful stationary cold water pressure washer designed for permanent installation in industrial, agricultural, transport, and commercial cleaning environments. Built for continuous operation, this high-performance system delivers exceptional cleaning power while offering the reliability, safety, and durability required for demanding daily use. With a robust crankshaft pump, water-cooled motor, and integrated water tank, it provides a dependable fixed-location cleaning solution for wash bays and centralised cleaning systems.

High-Performance Stationary Cleaning Power

Delivering up to 210 bar operating pressure and a water flow rate of up to 1000 l/h, the HD 10/21-4 ST is ideal for removing heavy dirt, mud, grease, and grime from vehicles, machinery, production equipment, agricultural facilities, and industrial workspaces. Its stationary design ensures the machine is always ready for use without the need for transport or setup.

Durable Crankshaft Pump & Water-Cooled Motor

At the heart of the machine is Kärcher’s proven high-performance crankshaft pump with ceramic pistons and brass cylinder head, paired with a 4-pole low-speed water-cooled electric motor. This combination provides outstanding durability, high efficiency, and long service life under continuous professional operation.

Designed for Continuous Operation

The HD 10/21-4 ST is specifically engineered for fixed installations where reliable cleaning performance is required throughout the day. The integrated storage tank with float valve and dry-running protection helps safeguard the pump, while electronic monitoring systems protect against leaks, phase failure, overvoltage, and undervoltage conditions.

Robust Industrial Construction

The machine features a heavy-duty powder-coated steel frame and housing, providing excellent protection in demanding industrial and agricultural environments. Its robust construction ensures dependable operation even under harsh working conditions.

Simple Operation & Easy Maintenance

A large rotary selector switch allows straightforward operation without extensive training. Clear status and error displays provide immediate feedback to the operator, while the service-friendly design ensures fast access to maintenance components, reducing downtime and servicing costs.

Flexible Cleaning System Integration

The HD 10/21-4 ST is prepared for integration into larger cleaning installations and can be upgraded with optional remote controls, automatic pressure relief systems, pressure gauges, operating hour counters, and additional detergent inlets. This flexibility makes it suitable for a wide range of professional cleaning applications.

Integrated Detergent Dosing System

A built-in detergent intake system with dosing valve and level monitoring allows accurate chemical application when required. An additional detergent inlet can also be fitted for increased cleaning flexibility.

Key Features

• Genuine Kärcher part: 1.524-963.0
• 210 bar operating pressure
• Max pressure: 270 bar
• Water flow rate: 500–1000 l/h
• Stationary cold water pressure washer
• Durable crankshaft pump with ceramic pistons
• 4-pole low-speed water-cooled motor
• Integrated water storage tank with float valve
• Dry-running protection system
• Powder-coated steel frame and housing
• Integrated detergent dosing system
• Electronic monitoring and fault protection
• Prepared for remote operation and system integration
• Power supply: 400V 3-phase

Ideal For

• Fixed vehicle wash bays
• Agricultural cleaning facilities
• Industrial production environments
• Workshops and maintenance depots
• Construction and municipal equipment cleaning
• Food and chemical industry cleaning applications