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Gerni MH 4M 120/690, 1740PSI Professional Hot Water Cleaner

RRP: $7,205.00

SALE Price: $5,999.00

Quick Overview

Gerni MH 4M 120/690, 1740PSI Professional Hot Water Cleaner, 3 Year Warranty

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Accessories List

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Gerni DN6 Extension Hose 10 metre, plus coupling kit

Gerni DN6 Extension Hose 10 metre, plus coupling kit

Gerni Curved Underchassis lance with 90° bend

Gerni Curved Underchassis lance with 90° bend

Customer Testimonials

"Hi guys, just wanted to let you know how the generator is going. I bought the Pramac 6kva auto start unit 6 months ago to use as a backup power source for our 'off grid' solar system. It's works really well. I used to have to manually start up our old generator each time the batteries ran low. This mean't I had to be there to switch it off as well. I'm really happy with the auto start function that the Pramac has. This means i don't have to worry about batteries being low nor do i have to stick around the shed whilst the generator is running. Many thanks to Sean and Steve for all the help".

I was pleasantly surprised at the speed at which we received our generator and even more impressed at steve following up to ensure we received it. Wonderful service indeed. Thanks a lot steve. Extremely good service.

Product Details


Gerni MH 4M 120/690, 1740psi Professional Hot Water High Pressure Cleaner. The Gerni MH 4M 120/690 series delivers high performance, ease of use, low noise and high cleaning efficiency.

When transport and storage are important and high cleaning power is needed, the Gerni MH 4M 120/690 series is an ideal choice. Developed for routine yet tough cleaning tasks in automotive, agricultural, construction or light industrial environments.

It delivers high performance, ease of use, low noise and great cleaning efficiency. Running and maintenance costs are reduced. The flow-activated control system contributes to even more comfortable use of the machine and assures durability and reliability. The EcoPower boiler system offers > 92% efficiency for significantly reduced fuel consumption and lower running costs.


  • EcoPower boiler with > 92% efficiency
  • Flow-activated control system for additional comfort in use
  • 1450 RPM motor
  • NA5H pump with 3 ceramic pistons
  • Easy to use control panel
  • Ergo 2000 accessory concept
  • Includes BA Valve backflow preventor
  • Steel frame and chassis
  • Quick service concept reduces maintenance costs
  • Optimal machine protection against low fuel, low pump oil. Includes flame sensor and exhaust gas temperature sensor
Note: this model was formerly known as the Gerni Neptune 4-28FA

Gerni Neptune 4 Series Manual


Additional Information

SKU 107146619
Brand Gerni
Max. Pressure 1740psi
Max Flow Rate 11 -11.5 Litres / minute
Pump Type 1450 rpm
Pump Description Wobble disc pump system, brass valve pump head with ceramic pistons
Fuel Electric
Phase Single Phase
Voltage 240 Volt
Rated Power 3.5kW
Lance & Spray Gun Universal lance, Ergo 2000 Gun
Nozzles Tornado Plus nozzle
Pressure Hose 10m high pressure hose
Diesel Boiler Eco Power Boiler with > 92% efficiency
Thermostat °C 90 / 150°
Max. Water Temperature 150°C
Diesel Tank (L) 15 Litres
Detergent Tank (L) 10 Litres
Power Cable Length 5 metres
Net Weight (kg) 135.5 Kg
Dimensions (LxWxH mm) 1053x685x760
Manufacturers Warranty 3 year warranty


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For details relating to Crommelins warranty CLICK HERE



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The Power of Pressure Washers 


Gerni (Nilfisk) MH Professional Hot Water Series 

NOTE: these are the European Nilfisk branded models. The Australian models are Gerni branded.


Gerni (Nilfisk) MH Hot Water Unit Maintenance 

NOTE: these are the European Nilfisk branded models. The Australian models are Gerni branded.




Product Faqs

Ask a Question

  • If something happens to the pressure washer unit, how do I get it repaired?

    The benefit of buying a Gerni Pressure Washer is that your unit is backed by the national Gerni Service Agent support network – if you ever need the unit repaired, need spare parts, or inspected under warranty, you are covered. You are also buying a product that is part of the global cleaning company Nilfisk, which has been a market leading manufacturer of cleaning products for over 100 years across 70 different countries.

    Buying a Gerni means you are buying quality and a top performing cleaning unit that will last you for years to come – it also means that your product has spare parts and servicing support country wide.

  • Can you explain the Gerni naming to me, for example the "Gerni MC 4M 160/620" - what does this coding mean about the product?

    Hi, great question - the structure of the Gerni naming is designed to give an easy and transparent overview of the key technical details and features of the product. Looking at your example of the MC 4M 160/620:

    = this stands for Mobile (as opposed to Stationary (S) pressure washer units).

    = Cold Water (as opposed to H for Hot Water units).

    = type of pump profile ranging from 2 through to 8.

    M = Mid Range class of 1450rpm motor. The others are Compact (C) class of 2800rpm motor and Premium (P) class of 1450rpm motor. 

    160/620 = 160 pump pressure (in bar), and 620 water flow rate (Litres per hour).

    There can also be additional letters and number codes for other models denoting certain parts of equipment or features such as X (hose reel), or PA (pressure activated) and FA (flow activated).

    Each model has full information in the Specifications tab and within the downloadable Product Manual.

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