The only Turbo to use when the air temperature is above 91°F (33°C). Delivers excellent quality alcohol in hot conditions. Heat is also the only yeast we recommend for 'stacking'. Up to a 200 liter (52.8 gallons) volume can be fermented using 8 sachets (providing the start liquid temperature and air temperature are both 68°F (20°C). We recommend you use Turbo Carbon as it will significantly improve the performance of Heat Turbo Yeast.