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

Pressure Rating (PSI / Bar):
210 Bar (3,045 PSI) working pressure
240 Bar (3,480 PSI) maximum pressure

Flow Rate (L/min):
8.3 – 16.7 L/min (500 – 1000 L/h)

Power Type:
Electric – 3 Phase, 420V, 8 kW (50 Hz)

Water Temperature:
Hot water – min 80°C, max 155°C (inlet 12°C)

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

Pump Type:
Robust 3-piston axial pump with ceramic pistons

Included Accessories:
20 m Longlife high-pressure hose (DN 8, 400 Bar)
EASY!Force Advanced trigger gun
1050 mm rotating stainless steel lance
Power nozzle
Servo Control for water flow and pressure adjustment

Application Suitability:
A top-tier middle-class hot water unit built for intensive industrial and commercial applications. Ideal for construction, automotive, agriculture, transport and manufacturing environments where reliable high-performance cleaning is required.

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

Mounting / Portability:
Jogger mobility design with large rubber-tyred wheels and swivel castors
Push handles and integrated tilting aid for stairs and kerbs
On-board storage for accessories, suction hose and power cord
Dedicated storage compartment for detergents, gloves and tools

Dimensions (L x W x H) (Millimetre):
1300 x 800 x 1140 mm

Weight (kg):
187.5 kg (with accessories)
197.3 kg (incl. packaging)

Safety Features:
Pressure cut-off
Dry-running protection
Two detergent tanks (20 L + 10 L) with external fill points
Stainless steel heating coil
Eco!efficiency mode with optimised burner control for up to 20% fuel savings
Water filter for pump protection
SDS (soft damping system) for vibration and pressure surge absorption
Fuel and water safeguard system

Warranty & Service Support:

2 years (Plus 2 years when registered online)

The Karcher HDS 10/21-4 M Hot Water Pressure Cleaner is a heavy-duty professional cleaning system engineered for demanding commercial and industrial applications. Delivering 3,045 PSI (210 Bar) working pressure and up to 16.7 litres per minute (1,000 L/h) water flow, this high-performance machine combines pressure, water volume and heat to tackle stubborn grease, oil, grime and heavy industrial contamination.

Powered by a three-phase 420V electric supply and a durable 4-pole water-cooled low-speed motor, the HDS 10/21-4 M is designed for intensive professional use across transport, construction, agriculture, manufacturing, automotive and industrial maintenance.

With hot water temperatures up to 155°C, professional Karcher pump technology, eco!efficiency operation and a comprehensive accessory package, the HDS 10/21-4 M provides exceptional cleaning performance where productivity, reliability and long service life matter.

High-Performance Hot Water Cleaning

The Karcher HDS 10/21-4 M delivers 210 Bar working pressure, up to 240 Bar maximum pressure and an adjustable water flow of 8.3 to 16.7 L/min.

This combination of high pressure, strong water flow and hot water provides significantly greater cleaning capability when tackling oils, grease and stubborn industrial contamination.

Hot water can reduce the time and effort required for many cleaning tasks, making the HDS 10/21-4 M particularly well suited to businesses cleaning machinery, trucks, plant, equipment and heavily contaminated surfaces on a regular basis.

Hot Water up to 155°C

The HDS 10/21-4 M provides hot water cleaning with temperatures up to 155°C, giving professional operators additional cleaning capability beyond conventional cold water pressure cleaning.

Heat is particularly effective when cleaning:

• Oil and grease
• Workshop contamination
• Heavy machinery
• Engines and components
• Trucks and commercial vehicles
• Agricultural equipment
• Manufacturing equipment
• Industrial floors and hard surfaces
• Plant and construction equipment

For businesses regularly dealing with oily or greasy contamination, a professional hot water pressure cleaner can substantially improve cleaning efficiency.

Heavy-Duty Three-Phase Power

The HDS 10/21-4 M operates from a three-phase 420V electrical supply and is powered by a robust 8 kW, 4-pole water-cooled electric motor.

The low-speed motor configuration is designed for demanding professional operation, providing smooth performance while contributing to excellent durability and long service life.

Combined with the machine's high water flow, this makes the HDS 10/21-4 M particularly suitable for businesses requiring a pressure cleaner for intensive and frequent cleaning.

Professional 3-Piston Axial Pump

At the heart of the machine is a robust 3-piston axial high-pressure pump with ceramic pistons.

Ceramic pistons provide excellent wear resistance for demanding professional applications, while the integrated water filter helps protect the pump against contaminants entering through the water supply.

Karcher's SDS soft damping system helps compensate for vibration and pressure surges within the high-pressure system, further protecting components during intensive operation.

Eco!efficiency Reduces Operating Costs

Karcher's eco!efficiency mode optimises burner operation to reduce fuel consumption while maintaining effective hot water cleaning performance.

Fuel savings of up to 20% can be achieved in eco!efficiency operation, helping reduce running costs for businesses using their pressure cleaner regularly.

For fleet operators, workshops, industrial facilities and cleaning contractors performing frequent hot water cleaning, improved fuel efficiency can provide meaningful savings over the working life of the machine.

EASY!Force Advanced and Servo Control

The professional EASY!Force Advanced trigger gun uses the recoil force of the high-pressure water jet to significantly reduce the holding force required by the operator.

This improves comfort and reduces fatigue during extended cleaning jobs.

Servo Control allows the operator to adjust pressure and water flow to suit the cleaning task, providing greater control when moving between heavy-duty cleaning and more sensitive surfaces.

The 1050 mm rotating stainless steel spray lance further improves handling and working flexibility.

Built for Demanding Commercial Environments

At approximately 187.5 kg with accessories, the HDS 10/21-4 M incorporates Karcher's jogger-style mobility concept to make a substantial industrial machine easier to manoeuvre.

Large rubber-tyred wheels, swivel castors, integrated push handles and a tilting aid assist when moving the machine around workshops, yards and industrial facilities.

Integrated storage is provided for accessories, the suction hose and power cable, while a dedicated storage compartment provides convenient space for detergents, gloves and tools.

Dual Detergent System

The HDS 10/21-4 M features two integrated detergent tanks with 20 L and 10 L capacities.

External filling points simplify refilling and allow different cleaning chemicals to be carried on the machine, providing additional versatility across different industrial cleaning applications.

Professional Accessories Included

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

• 20 m Longlife high-pressure hose, DN 8, rated to 400 Bar
• EASY!Force Advanced high-pressure trigger gun
• 1050 mm rotating stainless steel spray lance
• Power nozzle
• Servo Control for pressure and water flow adjustment
• EASY!Lock professional connection system

The 20 metre Longlife high-pressure hose provides excellent working range around large machinery, trucks and commercial equipment without constantly repositioning the pressure cleaner.

Integrated Safety and Machine Protection

The HDS 10/21-4 M incorporates multiple systems designed to protect both the machine and its major components during intensive professional operation.

Key systems include pressure cut-off, dry-running protection, water filtration, fuel and water safeguards, SDS pressure surge damping and a durable stainless steel heating coil.

These features make the machine particularly suitable for businesses where reliability and reduced downtime are essential.

Ideal Applications

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

• Heavy machinery cleaning
• Earthmoving equipment
• Truck and fleet washing
• Transport depots
• Mechanical workshops
• Construction companies
• Mining support operations
• Agricultural machinery
• Manufacturing facilities
• Industrial maintenance
• Plant and equipment cleaning
• Commercial cleaning contractors
• Automotive workshops
• Industrial wash bays
• Oil and grease removal

Its combination of 3,045 PSI working pressure, 16.7 L/min flow and hot water up to 155°C makes the HDS 10/21-4 M particularly effective where cold water cleaning alone cannot efficiently remove heavy grease, oil and industrial contamination.

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 requiring a serious industrial hot water pressure cleaner capable of tackling grease, oil, machinery and heavy contamination day after day, the Karcher HDS 10/21-4 M provides an excellent combination of cleaning performance, efficiency and professional-grade durability.