Comet KM Extra 3.11 11/120 M - Single-Phase Hot Water Pressure Washer with Steam Operation
The Comet KM Extra 3.11 11/120 M is a professional hot water pressure washer designed for intensive professional and industrial use . This Comet hot water pressure washer combines pressure up to 120 bar and a flow rate of up to 660 l/h , ensuring consistent performance even in the most demanding applications. The presence of the 4-pole 1400 rpm motor with a professional Comet ZW pump ensures durability, reliability and continuous operation.
Comet KM Extra 3.11 is a professional pressure washer with diesel boiler equipped with PED certified steam operation , delayed Total Stop system and EASY START , features that make it ideal for the technical cleaning of machinery, industrial surfaces and professional vehicles.
COMET KM EXTRA features
- Ideal for intensive professional use
- High pressure detergent suction with tray + Suction from external tank
- Pressure Regulation with Flanged Valve
- Temperature control with electronic thermostat
- Flow Switch Operated Burner Control
- Maximum temperature 140°C / Steam
- Anti-limescale device
- Steam operation with PED certification
- General stop due to inactivity
- Integrated water suction from tank with inspectable filter

Technical specifications
This professional Comet hot water pressure washer has a single-phase 230V-50Hz power supply and a power consumption of 2.9 kW , combined with a 4-pole 1400 rpm motor with a professional Comet ZW pump . The machine integrates an 18-liter diesel tank with level float and filter, a 3.5-liter detergent tank and a 2.5-liter anti-scale device , ensuring operational autonomy and component protection.
The Comet KM Extra 3.11 11/120 M works with an operating pressure of 30 to 110 bar and a maximum pressure of 120 bar , developing a flow rate of 340 to 660 l/h . The outlet water temperature varies from 85°C to 140°C , with an inlet water temperature of up to 60°C. The boiler's fuel consumption is 3.5 l/h . The machine is supplied with a 10-metre high pressure hose .
ZW pump

The Comet ZW hot water pump is designed for professional and industrial applications up to 85°C , offering high reliability under continuous load. The brass head with one-piece stainless steel check valves , full ceramic plunger pistons , and Kevlar seals ensure resistance to wear, high temperatures, and chemicals. The large, reinforced crankcase , with increased oil capacity, improves lubrication and reduces operating temperatures, while the deeper fins optimize heat dissipation. The oversized industrial bronze connecting rods and 24 mm solid shaft make the pump ideal for professional transmissions and guarantee mechanical stability, long life, and consistent performance even under intensive use.
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Functional specifications
PED certified hot water and steam system
The diesel-fired hot water pressure washer offers steam operation with PED 2014/68/CE category II certification, a flow switch-activated burner, and electronic temperature regulation with minimal fluctuations, for professional high-temperature cleaning that's effective on grease and industrial residues.
Water Suction from Integrated Tank
This machine allows the suction of water from an integrated tank with an inspectable cartridge filter , a useful function in professional contexts without a direct water network, typical of construction sites and industrial environments.
High Pressure Detergent Suction
The Comet KM Extra 3.11 is equipped with high pressure detergent suction with quantity regulation from an internal 3.5 litre tank or from an external canister, the ideal solution for professional detergent washing applications on vehicles, machinery and technical surfaces.
Integrated anti-limescale system
The professional hot water pressure washer includes an anti-scale device with a dedicated pump and 2.5 litre tank , which protects the boiler and internal circuits, increasing the reliability of the industrial hot water pressure washer in continuous work.
Delayed Total Stop system and operational safety
The Comet professional pressure washer is equipped with a delayed Total Stop , a general stop due to inactivity, a professional safety valve and thermal protection for the boiler, ensuring operational safety and reduced consumption during intensive use.
Easy start EASY START
The EASY START system allows for quick and progressive starting of the engine, reducing absorption peaks and improving the operational stability of the professional hot water pressure washer even under prolonged working conditions.
Professional 4-pole motor
The Comet professional pressure washer integrates a 4-pole 1400 rpm motor combined with a Comet ZW pump and flanged pressure regulation valve, a solution designed to guarantee consistent performance, reduced wear and long life in intensive professional cleaning applications.
Characteristics
- 18 L tank with float and filter
- 4-pole single-phase motor
- Total Stop
- Easy-Start
- General stop due to inactivity
- Delayed start of the nice burner
- Professional safety valve
- Boiler thermal protection
- Independent boiler ventilation group
- Intensive Professional Use
- PED 2014/68/CE certification cat. II
- High pressure detergent suction
- Possibility of suctioning detergent from an external tank
- Water suction from integrated tank with filter
- Anti-limescale device with pump and 2.5 L tank
- ZW pump
- Electronic Thermostat
- Steam Operation
- Flow switch operated burner
- Professional control panel
- Delayed burner start
STANDARD Equipment
- GH 401 gun with Swivel (n. 2 o-rings) - 00080-01104
- Delivery hose kit M22X1.5 10M R1 1/4" - 00014-00276
- Angled lance with nozzle head, without nozzle - 10002-03590
- 1/4" MEG Flat Jet Nozzle - 00080-01374
- Flame Control Kit - 10001-00953

Equipment on Request
- Rotating hose reel with 5/16" hose 15 m