Prepare your cup just like at home by spooning the grounds into the removable filter basket and adding water. To turn it on, push the InstaStart Push-Button for matchless lighting for up to ten cups of coffee in just 18 minutes. The PerfectFlow Regulator keeps a constant heat, no matter the conditions: cold weather, low fuel or high altitudes. One 16.4-oz. (494 g) propane cylinder can power the coffeemaker for up to 4.4 hours.