Drum heaters come in various forms to heat liquids in metal containers. They can heat multiple containers or just one, and come in different configurations for different drum sizes. Band, base, and induction heaters are types of drum heaters, as well as heating jackets. Large drum furnaces can hold several dozen kegs but are expensive and use a lot of electricity.
Drum heaters can take a variety of different forms, although they are all designed to raise the temperature of liquids contained within standardized metal containers. There are a few basic categories that these devices fall into. A drum heater will typically be able to heat multiple containers at once or just one at a time. Since drums come in a wide variety of sizes, drum heaters are also created in a number of different configurations. Some keg heaters are intended to reduce viscosity to make pouring or mixing easier, while others are simply intended to keep the liquid from freezing.
The larger type of drum heater is sometimes known as a drum furnace. Mobile versions can hold a single drum or about four barrels on a pallet, though large, room-sized, heated units can often hold several dozen kegs. These heating rooms can heat large numbers of kegs at once and keep them at the desired temperature for long periods of time, although they are also typically expensive and use a large amount of electricity. Mobile kilns and keg heaters that heat only one keg at a time tend to be more efficient.
A band drum heater is a device that is essentially a heating element that wraps around the circumference of a drum to heat it. These units typically consist of a heating element sandwiched between glass mats and is lined with silicone or other materials. When a band heater is lined with silicone, it can typically be used to heat metal drums. Plastic drums can also use band heaters, although these units are usually lined with materials such as polyester.
Another type of drum heater that can heat one drum at a time is the base heater. Many of these units are designed to heat a single drum, though some can hold three or four. A common variant is the induction heater, which can only be used with steel drums. These electric heaters use a magnetic field to create eddy currents, known as Foucault currents, in the metal walls, base, and lid of the drum.
Heating jackets are also sometimes used to heat kegs. These act as sleeves that are pulled tightly over the barrel and heat at the same time as they insulate. Since the heated barrel cannot radiate its heat into the atmosphere, these devices tend to be energy efficient. Insulating jackets are sometimes combined with other heating methods to improve efficiency.
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