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Named for its 0.375 in. (9.5 mm) thickness, the rugged Watlow® 375 strip heater is capable of both high temperatures and high watt densities.

Watlow begins construction by accurately placing a coiled, nickel-chromium element wire in the center of the heater. The element wire is then embedded in magnesium oxide (MgO)-based insulation compacted into a solid mass creating excellent heat conductivity and high dielectric strength. The heater is then enclosed in aluminized steel or 430 stainless steel sheathing.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Aluminized Steel  1100 595 100 15.5
  • Aluminized steel sheath temperatures to 1100°F (595°C)
  • 430 stainless steel sheath temperatures to 1200°F (650°C)
  • Watt densities to 100 W/in² (15.5 W/cm²)
  • UL® approved to 240VAC (File No. E52951)
  • CSA approved to 600VAC (File No. LR7392)


  • Food warming
  • Freeze and moisture protection
  • Tank and platen heating
  • Packaging
  • Dies and mold heating
  • Autoclaves
  • Ovens
  • Telecom

Features & Benefits:

Features Benefits
Nickel-chromium element wire is centered in the heater
  • Assures uniform heat
Aluminized steel sheath
  • Operates at higher temperatures
  • Resists corrosion better than iron-sheathed heaters
  • Minimizes heat-up time
Optional 430 stainless steel sheath
  • Meets temperature requirements that reach up to 1200°F (650°C)
Post terminals, welded to the element wire
  • Produces strong, trouble-free connections
Rigid 3?8 in. (9.5 mm) thick design
  • Enables the heater to fit into many existing applications
Over 100 in-stock models in popular sizes and ratings
  • Allows next day shipment
Available dimensions are 11?2 in. (38 mm) wide and 51?2 to 48 in. (140 to 1219 mm ) long
  • Fits a variety of application needs