Alcotec - the "6" means it ferments 6 kgs of sugar in 25 litres) is the best example of this type. It will ferment 14% of alcohol in 3 days. It performs best in 25 litres but you can increase the volume somewhat (i.e.2 sachets and 50 litres). Larger volumes are possible but best with temperature control (cooling equipment). Without cooling of large batches fermentation will stick too soon at a low alcohol level.
Fermentation is over at s.g. 985 (approximately). Don't make the common mistake and assume that s.g. 1000 (0 on some hydrometers) means finished - there will be 2% more alcohol still to come! Always check s.g. and if fermentation sticks too high, there is probably a temperature problem. Have a look in our turbo yeast tips section for troubleshooting.
We also produce some speciality superyeasts, like the "stackable" GoldYeast 200 (currently only for the Scandinavian market) which will work well without cooling in batches up to 200 litres and can handle up to 600 litres without cooling but with some performance loss (but other superyeasts would cave in totally here).