What is the boil off rate on the G30 / G30³ This is around 7% / hour which is in line with commercial breweries. For 220v units, the boil-off is 3L/ hour. For 120v units, the boil-off is 2-2.5L/hour. Related articles What efficiencies can I expect from the G30/ G30³ ? Calculation - Mash and Sparge Water Volume What are the calculations that are used in the Recipe Creator? What is a simple way of reducing power to the element on the G30 to lower the temperature? What are the minimum and maximum grain bills for the G30?