Here's a post with more information on the iStill 100. What it is? Basically an iStill 50 column and management system, with a bigger boiler added underneath. For longer, more efficient runs of 8 to 9 hours instead of 4 to 5 hours. The iStill 100 boiler has a gross capacity of 120 liters and can easily hold 100 liters of net boiler charge. The boiler weights 18 kilo's and is 85 centimeters high.