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