Karcher HDS 10/21-4 Classic 3045 PSI Hot Water Pressure Cleaner

Pressure Rating (PSI / Bar):
210 Bar (3,045 PSI) working pressure
235 Bar (3,408 PSI) maximum pressure

Flow Rate (L/min):
5.8 – 16.7 L/min (350 – 1000 L/h)

Power Type:
Electric – 3 Phase, 400V, 8 kW (50 Hz)

Water Temperature:
Hot water – maximum 80°C (inlet 12°C)

Motor Brand and Type:
4-pole, water-cooled electric motor

Pump Type:
High-quality crankshaft pump with water fine filter protection

Included Accessories:
10 m high-pressure hose
Classic hot water trigger gun
1050 mm spray lance
Power nozzle

Application Suitability:
Built for heavy-duty industrial and commercial use, particularly in construction, agriculture, transport, and automotive environments. Ideal for removing grease, oil, and stubborn dirt where high pressure and flow are required.

Duty Cycle / Usage Class (Light, medium, or heavy-duty use):
Heavy-duty professional use

Mounting / Portability:
Puncture-proof, large wheels and crane hook for safe and easy transport. Open tubular steel frame provides durability and easy access to internal components for maintenance.

Dimensions (L x W x H) (Millimetre):
1075 x 722 x 892 mm

Weight (kg):
128 kg (with accessories)
138 kg (incl. packaging)

Safety Features:
Pressure switch-off system
Thermo and safety valve
Integrated water filter to protect the pump
Fuel shortage and water safeguard
SDS system for vibration dampening
Eco!efficiency mode for reduced fuel consumption and optimised burner performance

Warranty & Service Support:

2 Years (Plus 2 Years when registered online)

The Karcher HDS 10/21-4 Classic Hot Water Pressure Cleaner is a rugged three-phase industrial pressure cleaner engineered for demanding professional cleaning applications where high pressure, strong water flow and dependable hot water performance are essential.

Delivering 3,045 PSI (210 Bar) working pressure and up to 16.7 litres per minute (1,000 L/h) water flow, the HDS 10/21-4 Classic provides serious cleaning performance for removing grease, oil, mud and stubborn contamination from machinery, vehicles, equipment and hard surfaces.

Powered by a 4-pole water-cooled electric motor and equipped with a heavy-duty crankshaft pump, this machine is designed for professional users who value durability, straightforward operation and easy servicing.

Heavy-Duty Hot Water Cleaning Performance

The Karcher HDS 10/21-4 Classic combines 210 Bar working pressure with up to 16.7 L/min water flow, providing the pressure and water volume required for demanding commercial and industrial cleaning.

Unlike pressure alone, the combination of high pressure and strong water flow allows the machine to loosen contamination and efficiently flush dirt and debris away from the cleaning surface.

Add hot water up to 80°C, and the HDS 10/21-4 Classic becomes particularly effective when dealing with greasy, oily and heavily contaminated equipment.

Hot Water Cleaning up to 80°C

Hot water provides a significant advantage when cleaning grease, oil and other contamination that can be difficult and time-consuming to remove using cold water alone.

The HDS 10/21-4 Classic provides water temperatures up to 80°C, making it an excellent choice for:

• Heavy machinery
• Earthmoving equipment
• Trucks and commercial vehicles
• Agricultural machinery
• Mechanical workshops
• Industrial equipment
• Engines and components
• Transport depots
• Commercial wash bays
• Grease and oil removal

For businesses performing regular equipment and machinery cleaning, the combination of heat, pressure and high water flow can significantly improve cleaning productivity.

Heavy-Duty Crankshaft Pump

One of the major features of the HDS 10/21-4 Classic is its robust high-quality crankshaft pump.

Designed for demanding professional applications, the pump provides dependable high-pressure performance and excellent durability for businesses requiring regular heavy-duty cleaning.

An integrated water fine filter helps protect the pump against contaminants entering through the water supply, contributing to reliability and longer component life.

4-Pole Water-Cooled Electric Motor

The HDS 10/21-4 Classic is powered by an 8 kW, 4-pole water-cooled electric motor operating from a 400V three-phase power supply.

The 4-pole motor configuration is particularly suited to professional cleaning equipment where reliability and long operating life are important.

Combined with the heavy-duty crankshaft pump, this provides a robust drive system engineered for demanding commercial and industrial environments.

Rugged Open-Frame Construction

The HDS 10/21-4 Classic has been designed with a strong open tubular steel frame, providing excellent protection while allowing straightforward access to major components.

This design is particularly valuable in demanding industrial environments where equipment needs to be robust, serviceable and easy to maintain.

Rather than unnecessary complexity, the Classic range focuses on the features professional operators need for reliable day-to-day cleaning.

Built for Tough Australian Worksites

Large puncture-proof wheels help the HDS 10/21-4 Classic travel across uneven ground and industrial worksites.

An integrated crane hook provides another important advantage for construction, industrial and equipment hire applications, allowing the machine to be safely lifted and repositioned when required.

At 128 kg with accessories, its relatively compact dimensions of 1075 x 722 x 892 mm also make it practical to transport between worksites.

Eco!efficiency for Reduced Fuel Consumption

Karcher's eco!efficiency mode allows economical hot water operation at approximately 60°C while maintaining full water flow.

Optimised burner performance helps reduce fuel consumption and operating costs while still providing effective hot water cleaning.

This is particularly useful for businesses operating their pressure cleaner frequently, where fuel efficiency can contribute to meaningful savings over the machine's working life.

Professional Accessories Included

The Karcher HDS 10/21-4 Classic is supplied with:

• 10 m high-pressure hose
• Classic hot water high-pressure trigger gun
• 1050 mm spray lance
• Power nozzle

The straightforward professional accessory package provides everything required for general industrial hot water pressure cleaning.

Integrated Machine Protection

The HDS 10/21-4 Classic incorporates multiple systems designed to protect the pressure cleaner during demanding professional operation.

These include:

• Pressure switch-off system
• Thermo valve
• Safety valve
• Integrated water filter
• Fuel shortage protection
• Water safeguard system
• SDS vibration and pressure surge damping
• Eco!efficiency burner control

These systems work together to protect major components and support dependable operation in demanding commercial environments.

Ideal Applications

The Karcher HDS 10/21-4 Classic is ideal for:

• Construction companies
• Earthmoving contractors
• Heavy machinery cleaning
• Agricultural equipment
• Farms and rural businesses
• Truck and fleet washing
• Transport depots
• Mechanical workshops
• Automotive businesses
• Manufacturing facilities
• Industrial maintenance
• Plant and equipment cleaning
• Commercial cleaning contractors
• Equipment hire companies
• Commercial wash bays
• Grease and oil removal

Its combination of 3,045 PSI pressure, 16.7 L/min water flow, 80°C hot water and heavy-duty crankshaft pump technology makes it an excellent choice for professional users requiring straightforward, reliable industrial cleaning performance.

Why Buy From Hytec Services?

We proudly supply Karcher commercial and industrial pressure cleaners Australia-wide, with ongoing servicing, repairs and maintenance available throughout the Illawarra, South Coast, Southern Highlands, Macarthur, Southern Sydney and surrounding NSW regions. Backed by more than 40 years of industry experience, Hytec Services provides expert advice, genuine spare parts and dependable after-sales support to keep your equipment performing at its best.

As an experienced Karcher dealer and service agent, Hytec Services can assist with machine selection, accessories, spare parts, scheduled maintenance and repairs throughout the working life of your equipment.

For businesses looking for a rugged industrial hot water pressure cleaner with high flow, strong pressure and straightforward heavy-duty construction, the Karcher HDS 10/21-4 Classic provides an excellent combination of performance, durability and value.