Drum Heaters

Zesta Watlow Drum Heaters
Zesta Watlow Drum Heaters
Watlow flexible drum heaters are designed for use on 5, 30, and 55 gallon metal drums. They come with six-foot (1.8 m) cord and plug set and latch fasteners and springs as standard features. Includes optional preset or adjustable thermostat.

Watlow Flexible Heater Datasheet (EN)
Watlow: Your Heat Solutions Resource Brochure (EN)

Watlow Elements Souples De Chauffage Fiche Technique (FR)
Watlow: Vos Solutions de Chauffage Brochure (FR)
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Product Features

  • Protects fluids stored in drums from freezing temperatures.
  • Six-foot cord and plug set included for convenient use.
  • Quick installation with easy operating latch fasteners.
  • Custom heaters available for non-standard sizes.

Performance Capabilities

  • Available with fixed or adjustable thermostats for temperatures up to 330°F (165°C)
  • Watt density of 6 W/in² (1 W/cm²)


  • Freeze protection
  • Viscosity control

Application Hints:
  • Allow a three-inch (76 mm) gap between heater ends when clamped around a drum.
  • Heaters with thermostat settings of 40°F and 60°F (4°C and 16°C) will have open circuit readings if room temperature exceeds the thermostat settings.
  • Heaters cannot be bench tested since the thermostat is located over a no-heat section of the heater. Accurate testing of the heater requires it to be placed over the drum which is to be heated.
  • When a single heater is used, place the heater at the bottom of the drum to minimize stratification.