A double jacket melter is a type of industrial equipment that is used to melt and heat materials, such as wax or asphalt. It consists of a cylindrical tank with a heating element inside, and a jacket of water or steam around the outside of the tank. The jacket is used to transfer heat to the material inside the tank, and the temperature can be controlled by adjusting the flow of water or steam.

Double jacket melters are commonly used in the manufacturing of candles, as well as in the paving and roofing industries. They are highly efficient and can melt and heat materials quickly and evenly. They are also relatively easy to operate and maintain.

Double jacket melters are available in a range of sizes and capacities to suit different production needs. They can be powered by electricity, gas, or oil, and may be equipped with features such as temperature controls, agitators, and level sensors.