Thermal carafes are an extremely useful device, especially for coffee makers. When you have a massive load of work or you are pulling an all-nighter, a hot cup of coffee needs to be ready for you. Thermal carafes are super-efficient in these situations, as they can keep coffees hot for the longest hours. Even the lowest quality carafe can maintain a warm temperature for about 2 hours. The best ones out there can keep your coffee hot for up to 12!