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Industrial Heaters & Heating > Industrial Finned Strip Heaters

Finned Strip Heaters - 375 Finned Strip Heaters
Watlow’s 375 finned strip is constructed of highlycompacted MgO-based insulation, which conducts heat efficiently from the nickel chromium element wire to the sheath. Two-inch wide (51 mm) aluminized steel fins are attached in a way that maxi-mizes surface contact so heat is transferred into the air faster. Lower sheath temperature and element life are all maximized by this finned construction.


Finned strip heaters com in available lengths from 51⁄2 to 48 in. (140 to 1220 mm).

Performance Capabilities:

  • Aluminized steel sheath temperatures to 1100°F (595°C)
  • Watt density up to 33 W/in2 (5.1 W/cm2)
  • UL® approved to 240VAC (File No. E52951)
  • CSA approved to 600VAC (File No. LR7392)




Finned Strip Heaters are used for both forced (mounted in a duct) and natural convection air heating (mounted at the bottom of cabinet type ovens).
The Finned Strip Heater's basic design consists of a helically wound resistance coil placed in a specially designed ceramic insulator. The resistance coil is mechanically connected to screw terminal for positive connection. Stainless steel rectangular tubing is used to house the heater assembly. All remaining voids are filled with high purity magnesium oxide to increase thermal conductivity and dielectric strength.

Nickel Plated Steel Fins (SS Optional) are mounted to the rectangular tubing. The fins have been specially designed to provide maximum surface contact for good heat dissipation into the finned cross sections, thus resulting in rapid heat transfer to the air.

TEMPCO Finned Strip Heaters are manufactured in a full line of standard sizes, electrical ratings and terminations, or can be made to your specifications.

Various sizes "In Stock" for immediate delivery.


Standard Specifications & Tolerances of Finned Strip Heaters.
If tighter tolerances are required, consult Tempco.

Performance Ratings
Maximum Sheath Temperature: 1200°F (650°C)
Still Air
Max. W/in2
Max. W/cm2
Up to 300°F (149°C)
20
3.1
300° to 600°F (149 to 316°C)
16
2.5
600° to 800°F (316 to 427°C)
10
1.6
Moving Air
Max. W/in2
Max. W/cm2
At 600 ft./min., up to 200°F (3 M/sec., up to 93°C)
40
6.2
At 600 ft./min., up to 400°F (3 M/sec., up to 204°C)
30
4.7
At 600 ft./min., up to 600°F (3 M/sec., up to 316°C)
20
3.1
Electrical Ratings
Maximum Voltage: 480VAC (when applicable)
Maximum Amperage: 22 amps
Resistance Tolerance: +10%, -5%
Wattage Tolerance: +5%, -10%
Material Specifications & Physical Sizes
Sheath: 304 Stainless Steel
Fins: Nickel Plated Steel Fins (SS Optional)
Screw Terminals: Stainless Steel 10-32 UNF Threads
Width Including Fins: 2"
Height Including Fins: 1-3/8"
Length Tolerance: Up to 24" ±1/16", over 24" ±1/8"
Mounting Slot Size: Standard 5/16" x 1/2"
Oversize For Secondary Insulating Bushing: 1/2" x 5/8" for 480 Volts and above




Industrial Finned Strip Heaters





Industrial Finned Strip Heaters


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