The Recirculating Chiller F-305 / F-308 / F-314 are specifically designed to work with laboratory equipment such as rotary evaporators, parallel evaporators, Kjeldahl, and extraction products. You benefit from convenient central temperature setting, energy-saving ECO-mode, and automatic start/stop when used in conjunction with the Rotavapor® R-300 system. View more
The efficient way of cooling


  • Efficient distillation due to complete integration into the BUCHI rotary evaporation system
  • Saves time thanks to instant start with automatic and dynamic pressure adjustment without waiting until chiller reaches it’s set temperature


  • ECO-mode: saves energy and reduces heat emission by switching into a stand-by mode when not in use
  • No water consumption
  • Maximizes distillation capacity while reducing solvent emissions due to intelligent integration of all process parameters using the Interface I-300 / I-300 Pro


  • Seamless plug & play integration into:
    • Fully automated BUCHI Rotavapor® R-300 systems including all process parameters
    • BUCHI extraction and Kjeldahl solutions

Seamless Integration

Convenient temperature setting and control when integrated in a Rotavapor® R-300 system.

Water saving

A rotary evaporator typically consumes 40 liter of water per hour. Operating with a chiller this valuable resource is conserved.


The ECO-mode in conjunction with the interface saves energy and reduces heat emission by switching into a stand-by mode when not in use.

Temperature lock

Lock the set temperature by pushing the navigation knob to avoid unintentional changes.

Optimal cooling

Operating with a Rotavapor® R-300 system, the vacuum is automatically adjusted to the heating and cooling temperature, maximizing the distillation performance.


Conveniently set the cooling temperature directly on the chiller or on the central Interface I-300 / I-300 Pro.

Expert Advice

Can I reduce the energy consumption of the evaporation system?

Eco-mode label

Yes, the ECO-mode is an integral part of the BUCHI Rotavapor R-300 system. Both bath and chiller enter a stand-by more after a pre-defined period of time and are restarted automatically when required.

What refrigerant is used in the recirculating chiller?

The refrigerant in all BUCHI recirculating chillers is R-134a (1,1,1,2-Tetrafluoroethane). This is a haloalcane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane), but with less ozone depletion potential.

When is it recommended to work with a recirculating chiller?

When you use a solvent like petroleum ether, a recirculating chiller should be implemented if the tap water is warmer than 15 °C. The temperature difference between the boiling point of the solvent and the cooling water temperature should be 20 - 25 °C in order to achieve a good condensation of the solvent in the condenser and to keep a good solvent recovery.

What is the recommended cooling liquid in the recirculating chiller?

The mixture on the coolant is very important. If the mixture is not correct, it may freeze in the chiller and block or destroy the pump. Therefore we recommend a mixture of ethylene glycol and water 30/70 (%V). This mixture has a freezing point of -14 ° C. As the F-100 has a fix temperature of 10 °C also water is ok.

How much heat is generated by a chiller?

The compressor in the chiller generates heat. The heat is blown out of the unit by a fan. The heat emission depends on the cooling capacity of the chiller. The heat emissions are:

  • F-100: max. 300 W
  • F-105: max. 300 W
  • F-305: max. 300 W
  • F-308: max. 500 W
  • F-314: max. 1000 W
  • F-125: max. 1800 W

In standby mode is the compressor and also the circulating pump turned off and do not generate any heat emissions.

P: 1300 552 003