The G45 holds a special place in the KIRSCH + MAUSSER product range. Manufactured in the classic retro design of the UG series and equipped with the key technical features of the G roasters, the G45 combines an elegant design with enhanced functionality even in its standard version. Furthermore, additional options such as pneumatic operated opening flaps on the bean container, roasting drum and cooling sieve outlet allow for convenient operation of the roasting machine. As standard, the G45 roaster is also equipped with a manual control system via pushbuttons. A semi-automatic or fully automatic control system with touchscreen is optionally available. All control options ensure safe processing of green and roasted coffee.

If you are reaching the capacity limits with your UG but still want to process smaller batches, the G45 – with its flexible drum volume between 20 and 55 kilograms – is the ideal choice.


Special vanes inside the roasting drum that were specially developed for the G45 ensure that the coffee beans are mixed evenly during the roasting process, producing a homogeneous final product. In addition, the G45 offers the following benefits:

  • Frequency converter to adjust roasting air volume
  • Precise airflow thanks to the traditional “flavor wheel”
  • Intensive cooling
  • Powerful fans
  • Reproducible product quality
  • Independent drives for the drum, stirrer, and roasting and cooling fans
  • Additional separate cooling sieve outlet
  • Easy to clean thanks to large maintenance openings
  • Reduced dust emissions thanks to additional cooling exhaust air cyclone
  • Frequency converter to adjust drum rotation speed (optional)


Batch size (kg)
20 - 55
Roasting times (min)
10 - 20
Roasting capacity (kg/h)
100 - 150


All of the G45 roasters are equipped with thermocouples as standard to document the roasting supply air, product, and exhaust air temperatures. The basic version is controlled manually. Alternatively, the G45 roasters can be equipped with semi- or fully automatic controls via a touch panel.

  • Recipe management with up to 20 user-definable recipes; saved settings can be reproduced safely and automatically (semi- and fully automatic control solution)
  • six temperature levels can be defined in advance for each recipe (semi- and fully automatic control solution)
  • Visualization of the roasting curve on the touch screen (semi- and fully automatic control solution)
  • Burner output can be selected manually or automatically from a recipe (semi- and fully automatic control solution)
  • two additional potentiometers allow for a mechanical regulation of the air volume and burner capacity in steps of 1% (semi-automatic control solution)
  • Interfaces for external software systems from Artisan and Cropster (semi- and fully automatic control solution)
  • Process reliability guaranteed via pneumatically controlled opening flaps on the bean container, roasting drum, and cooling sieve outlet (semi- and fully automatic control solution)
  • automatic heat shutoff when the desired final temperature is reached
  • automatic safety shutdown of the burner when the temperature limit is reached


The burner used in the G45 can be configured for use with natural gas or propane, depending on the specific requirements. In addition, it stands out due to the following features:

  • Higher capacity
  • Continuously adjustable for a more flexible roasting process
  • State-of-the-art safety technology, including gas and flame monitoring

The UG series roasting cyclone features a large, wheeled chaff collection container made of aluminum, making it light and easy to empty. In addition, the roasting cyclone stands out due to the following features:

  • Individually adjustable
  • Roasting fan above the cyclone enables particularly high separation efficiency
  • Additional water intake on the cyclone collecting containers (optional)

The G45 comes as standard with an additional cyclone for the cooling exhaust air. This additional exhaust air treatment keeps the amount of dust particles that enter the environment to a minimum.

Even in the basic version, the G45’s roasting fan is equipped with a frequency converter. In addition, it stands out due to its particularly high performance and can be connected to an exhaust air treatment system.


KIRSCH + MAUSSER green coffee conveyors make it extremely easy to feed green coffee into the G45’s feed hopper.

To further treat the visible exhaust gases released during roasting, the G45 can be equipped with an afterburner specially designed for this process.

KIRSCH + MAUSSER destoners reliably remove foreign objects with a higher specific weight than roasted coffee.