My Account

You have no items in your shopping cart.

Gerni MC 5M 240/870PE, Petrol Honda Pressure Washer, 3480PSI

price: 2199final price: 2199
Gerni MC 5M 240/870PE, Petrol Honda Pressure Washer, 3480PSI Review  |  Q&A  | 


RRP: $2,849 Save $650

Save $650 (23%) off RRP of $2,849

FREE Shipping

Ask a question (12)

Learn More About Zipmoney Payment

Out of Stock. New Models Due March 2019

Express Shipping Price Match Guarantee Customer Reviews

Quick Overview

Gerni MC 5M 240/870PE, Honda 9hp High Pressure Washer 3480PSI, 1 year warranty

Quick Overview

Gerni MC 5M 240/870PE, Honda 9hp High Pressure Washer 3480PSI, 1 year warranty


Accessories List

Retail Price

Our Price


Gerni Inlet Scution Hose with Filter

Gerni Inlet Scution Hose with Filter

Gerni DN8 Extension Hose 10 metre, plus coupling kit

Gerni DN8 Extension Hose 10 metre, plus coupling kit

Water Suction  Kit

Water Suction Kit

Gerni Turbohammer Plus 1125 Lance W12 0400

Gerni Turbohammer Plus 1125 Lance W12 0400


Product Description

- Currently FREE with the Gerni MC 5M 240/870PE is a 5 Litre Bottle of Gerni Multi-Purpose Detergent, RRP $20 (while stocks last):

Gerni 5 litre multipurpose detergent


Tough commercial pressure washer powered by Honda, The Gerni MC 5M 240/870PE designed for everyday cleaning in the Agricultural, Construction, Food or Transport industries and where there is no electrical power.

With a world leading Honda engine, ceramic pistons, pneumatic wheels and tough framing, this is a premium choice for commercial grade cleaning which will last for years to come. 

Optional accessories include extension hose and powerspeed vario lance which is excellent for larger concrete areas and for particularly tough to clean surfaces.


  • 3480 PSI Pump Pressure
  • 14.5 l/m Flow Rate
  • 9Hp Honda GX270 Motor
  • AR Pump
  • Adjustable Pressure unloader
  • Low oil Shutdown
  • Built-in Thermo Sensor
  • Industrial grade Gun/lance Assembly
  • 10M Heavy Duty Hose
  • In line Chemical Injector
  • Long life Brass Pump with Ceramic Pistons
  • Robust Aluminium Frame (Lifetime Warranty)
  • Pneumatic wheels on 20mm Steel Axle
  • 1 year Gerni Pressure Washer warranty, 3 years Honda Engine warranty

INCLUDED: Gerni MC 5M 240/870PE Honda Powered Petrol Washer with 10m High Pressure Hose, ERGO 2000 Gun, FlexoPower lance - 96cm, Flexopower Head Inc Nozzle.

 Note: this model was formerly known as the Gerni Poseidon 5-50PE

Pressure Washer Table


Gerni Poseidon Petrol Manual

Additional Information


SKU 106174822
GTIN (Global Trade Item Number) 5715492123209
Brand Gerni
Product Type Honda Pressure Washer. Manufactured by Gerni, designed for commercial cleaning / washdown applications
Rated Power 9 Horsepower
Fuel Petrol
Max. Pressure 3480PSI
Flow 14.5 Litres per minute
Pump Type 3440RPM
Pump Description Crankshaft pump system, brass valve pump head with ceramic pistons
Power Petrol Powered, Honda GX270 Engine
Max. Water Temperature Can accept up to 60°C
Nozzles Tornado Nozzle
Net Weight (kg) 45.4 Kg
Hose Length 10 metre
Product Dimensions (mm) LxWxH 1041 x 546 x 635
In The Box Gerni POSEIDON 5-50PE Honda Powered Petrol Washer with 10m High Pressure Hose, ERGO 2000 Gun, FlexoPower lance, tornado nozzle
Manufacturers Warranty 1 year Gerni Pressure Washer warranty, 3 years Honda Engine warranty


Product Videos

The Power of Pressure Washers

Power Washing Brickwork

Write a Product Review

Product Faqs

Ask a Question

  • Q:Is the engine a pull chord start or an electric on-off switch start?

    Hi, the engine is an easy recoil pull start. 


  • Q:Hi, are the Gerni Poseidon petrol powered pressure washers belt driven or direct drive?

    Thanks for you question, The pumps on the Gerni Poseidon 5-64 PE and the 5-75 PE are Belt Driven, wheras the rest of the Gerni Poseidon Petrol Powered range are Direct Drive.

  • Q:Will the engine idle while the gun is not being used to spray water? Does the engine have a throttle?

    Thanks very much for the question. The Gerni Poseidon Petrol Powered range do not have a pressure control for the throttle. While the gun is not in use the engine Revs will remain about the same or slightly under working revs.

  • Q:What are the differences in the type of pumps used in Commercial Grade pressure washers as opposed to Domestic pressure washers?

    Howdy, good question! Quality commercial grade pressure washers from brands such as Gerni, Crommelins, Subaru, AR Blue Clean will use brass pump heads which are stronger, can handle more intensive use and have a longer lifetime. 

    Quality commercial grade pressure washers will also use solid ceramic pistons to avoid corrosion and thus also extending the unit's lifetime.

    Domestic pressure washers will typically use an aluminum pump head and solid steel pistons. These are lighter in weight and suit household cleaning requirements. When looking at domestic washers, again its best to opt for a quality brand (as listed above) as they will use non-corrosive aluminum which will prolong the life of the unit, as compared to cheaper brands which are often prone to corrosion.


  • Q:Do the Gerni Pressure washers have ‘thermal cutout’? I’ve been told to look for this in a pressure washer I need for our business.

    Yes, the Gerni models have Thermal Cutout. This feature relates to electric pressure washers: the motor cuts out when heating is excessive to protect the unit.

    The petrol models have what they call 'thermal dump' - which involves a valve that releases water when pressure is built up, but the trigger of the gun is not pulled to release, also designed to protect your unit. 

  • Q:What's the best way to gauge the full power of a pressure washer? Is it just the PSI pressure rating?

    Hi James, great question. The cleaning power of a pressure washer is a combination of its pressure (PSI rating) and water flow rate (litres per minute). 

    Often people only consider the PSI number when looking at pressure washer models, but in fact testing shows that a greater water flow rate has a slightly greater influence on overall cleaning effectiveness:

    - Increasing the PSI rating of a pressure washer unit by 10% will increase cleaning effectiveness by 7%

    - Increasing the Water Flow Rate of a pressure washer unit by 10% will increase cleaning effectiveness by 12%

    So when comparing pressure models, be sure to consider each model's PSI rating and its Water Flow Rate capacity.   

    Note there are obviously many other factors on a unit to unit basis which also influences a pressure washer's cleaning capabilty such as; water temperature capacity, type and make of pump, piston types, nozzle & gun types etc.    

  • Q:Hi Paul, Do any of the Gerni range have the ability to use water from a non mains supply like a water tank?

    Yes, All the Gerni range can be connected to a Non Mains supply like a rainwater tank. The best way is to run it gravity fed from a tap at the bottom of the tank using a normal hose with the machine lower than the tank.

    The Super, PE and Three phase models can all be positioned above the source of the water from 0m - 2.5m under optimum conditions. In order to operate the machine correctly in “Suction Mode” we recommend that you check the operating instructions in the product manual attached for each Pressure Washer.

    Generally the Backflow preventer is not needed, the Gerni suction hose kit accessory is required and the air needs to be bled from the line.

    You can purchase the Suction Hose Kit in the accessories list for the all models.



  • Q: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.

  • Q: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.

  • Q:What accessory or accessories do you recommend to go with a pressure washer for cleaning outdoor concrete areas?

    Hi, for smaller domestic concrete requirements such as standard sized driveways or small patios, you can look at a patio cleaner/surface cleaner accessory - typically a circular head of around 12 inches that minimise splashback, have strong brushes which clean patios, paths, driveways etc. at quick rotation to significantly speed up the cleaning of your home outside areas.

    For larger concrete areas or for commercial requirements, look for a nozzle know as a turbo nozzle / turbohammer / powerspeed nozzle - These nozzles will spin a zero degree spray in a wider circle at 3000 rotations per minute. The spinning water jet hits the surface area from multiple angles, quickly breaking down caked-on dirt and grime. As a result, turbo nozzles can cut cleaning time drastically. Excellent for larger concrete areas and for particularly tough to clean surfaces. You can also consider a commercial grade patio/surface cleaner which are made of stainless steel and are available with some commercial grade washers. 

    In both the domestic and commercial cases, some pressure washer models come with the abovementioned accessory, and some models require the accessory to be added seperately.      

  • Q:I was wondering if you could tell me what type of pump is running on this unit?

     Hi - this unit uses a crankshaft pump. Thanks!

  • Q:I'm looking at a petrol pressure washer for preparing a roof to re-paint. The roof is old, it has a lot of built up rust and tough grime, and the old paint needs to be stripped off. What size machine do I need?

    Hi Tom, great question. Based on your described requirement, I would recommend you opt for a professional grade petrol pressure washer. For a heavier roof clean as you have described, you will need a washer powered by a minimum 8 horsepower sized engine. The cleaning specifications you are looking for would be a minimum of around 3500PSI and a flow rate of 14 litres per minute or above. This sized pressure washer will strip the roof back to a state ready to re-paint and it will do it in satisfactory time.   

    I would also suggest that you use a Turbo Head nozzle (these are often an extra accessory for many pressure cleaners), which are great for tough cleaning jobs: the nozzle will spin at a fine degree spray with the water hitting the surface area from multiple angles, which quickly breaks down caked-on dirt and grime.

    For any roof cleaning job, you will likely also need an extension hose which is another optional accessory for most pressure washer models.

    For lighter roof cleaning requirements where the roof is not as old and you don’t need to strip off rust etc. you can opt for a smaller petrol machines powered by a 5-7 horsepower sized engine and would have a pressure rating of around 2500 – 3500 PSI, with flow rate of around 9-12 litres/minute. These are classified as light trade/heavy domestic machines, which are slightly cheaper than professional grade machines, making them a great price proposition. People do use these slightly smaller machines for jobs similar to your description, however they will take a longer time to complete the task.    

    Brands such as Powershot, Gerni, Crommelins and Jetwave all have high quality models for both professional and light trade/heavy domestic requirements. Thanks. 



For details relating to the Gerni delivery process CLICK HERE



For details relating to the Gerni warranty CLICK HERE

Best Sellers From This Category: