This heater is controlled by a an adjustable thermostat.Flexible springs are used to attach the silicon heater around various diameter drums.✮ Specifications:Product Name: Drum ​HeaterVoltage:110/220VThe use temperature: 80 to 300 °F (30 to 150°C)Insulation resistance: >= 5 MohmCompressive strength: 1500V / 5SPower deviation: ± 8%Withstand voltage: > 5 KVMain use: heating and heat tracing✮ Size:200L | 1740X250mm | 2000w200L | 1740x250mm | 3000w200L | 1740x125mm | 1000w150L | 1520x250mm | 1700w100L | 1200x250mm | 1500w100L | 1200x300mm | 1800w30L | 940x250mm | 1000w20L | 860x200mm | 800w✮ Features:✧ This Silicon Metal Oil Drum Heater fits most drums. Ideal for heating up WVO for settling or processing biodiesel.✧ This barrel band heater is controlled by a an adjustable thermostat.✧ Flexible springs are used to attach the drum heater around various diameter drums.✧ The springs can stretch up to about 3 inches.✧ For plastic drums, it is recommended to keep the thermostat set below 100°F (37°C)✧ Suitable for Metal Bucket, Honey Bucket, Plastic Pail, Paint Pail, plastic and metal.✮ Package Includes:1 x Oil Drum Heater(The drum not included)[Note]:* Please do not install it in a place with water drops. Do not use the thermostat and the heater separately.* Do not use in an environment subject to fire or explosion.