This Fisher Scientific Isotemp 1013S Refrigerated Heated Bath Circulator has been tested for both heating and refrigeration functions. Heating function was successfully tested. For the chiller function we were able to get the water temperature down to 0° C but were not able to achieve a lower temperature. As both heating and cooling functions are working on this unit, we will be offering a 30 day money back guarantee return policy with buyer handling return shipping. Also note that shipping option has been selected as freight due to size and weight of unit. Shipping cost will be determined by buyer location at time of purchase. We will be happy to provide additional information as well as photos so please feel free to contact us with any questions.