Gerni MH 4M Series Hot Water Pressure Washer

The Gerni MH 4M series continues to deliver high performance, ease of use, low noise and great cleaning efficiency. Running and maintenance costs are reduced. The EcoPower boiler system offers > 92% efficiency for significantly reduced fuel consumption and lower running costs.


The Gerni MH 4M series takes mid-range hot water high pressure cleaners to a new level, meeting the latest productivity demands in the market. The Gerni  MH 4M is equipped with our industrial NA5 pump with 3 ceramic pistons and a high efficiency 4 pole motor. The flow activated control system improves user comfort and handling as well as overall machine reliability.

The Gerni MH 4M is suited for all hot water slightly heavier cleaning applications up to 4-6 hours use per day and due to the improved fuel saving EcoPower boiler system it offers very high efficiency and quick cleaning.

Service and maintenance can be carried out quickly, as all vital parts are easy to inspect and reach.Also, the diagnostics function of the 4M will give maintenance warnings to minimise any downtime.

The Gerni MH 4M concept ensures the most optimal transport concept across a wide variety of surface types with the 4 large wheels and great balance. Optimal accessory storage facilities with double lance holders, turnable hook for easy removal or winding of electrical cable, innovative spray gun holder and easy storage of detergent tanks. Together with the quick service access to all vital parts, this series will provide remarkable cleaning results, saved time and reduced costs.

Technical Specifications

  MH 4M 100/720   

 MH 4M 200/960X FA

Pump pressure (bar/MPa)



Cleaning impact (kg/force)



Pump (RPM)



Power Consumption (kW)



Water Flow Qmax/Qiec (l/h)






Key Features:

  • EcoPower boiler with EcoMode function
  • Brass pump head
  • Innovative design with 4 big wheels
  • Easy to transport, can even be pushed/pulled across uneven surfaces
  • Flow activated unloader system
  • Diesel oil tank with level sight
  • As standard delivered with 10L external detergent tank (A) and space for an extra tank (B)
  • Low fuel warning system
  • Onboard diagnostics function
  • One year commercial warranty

Download the Gerni MH 4M Product Brochure