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Tempco enclosure heaters are the answer to all your enclosure heater needs. Our heaters are designed to help electric, electronic, pneumatic, hydraulic and mechanical equipment perform at top capacity by protecting them against low temperatures, condensation and corrosion. Tempco offers many different styles of heaters that can be used in enclosure heating applications. Our most popular styles are displayed on the next few pages.
Typical Applications
  • Traffic Signal Control Boxes
  • Automatic Teller Machines
  • Outdoor Electrical Power Enclosures
  • Control Panels
  • Control Valve Housings
  • Switch Gear
  • Clothing Lockers

Determining the Minimum Wattage for Your Application
Determine the lowest temperature to which the enclosure is expected to be exposed.
Determine the operating temperature to which you want the enclosure heated.
Subtract the ambient temperature from the the enclosure temperature to get the temperature change required.
Calculate the surface area of the enclosure. For a rectangular enclosure use the formula:
2 [(Length Width) + (Length Height) + (Width Height)]
Select the correct table below depending upon whether your box is insulated or non-insulated. Read from the table the wattage required depending upon your calculated temperature change and surface area.
Add an additional 50% of the determined wattage if the enclosure is to be located in windy conditions.

Selecting the Right Heater for Your Application
1. Determine the wattage of heater(s) that you need. See the instructions on this page to determine your wattage requirements.

2. Determine the type of heater that you need. Depending upon conditions, one heater type might be better than others. Items to take into consideration are space constraints inside the enclosure and wattages required.

3. Determine the number of heaters you need. You can combine multiple heaters to achieve your wattage requirements.

4. Determine how you will control the heaters. Will you use built-in thermostats to monitor the temperature? Or will you use a single temperature control to monitor and control the heaters? Tempco manufactures a wide range of temperature control devices and when multiple heaters are required, Tempco can supply you with the temperature controls that will meet your needs.


Insulated Enclosure Wattage Selection Table
Temperature TOTAL SURFACE AREA ft2 (m2)
F (C) 2
(0.19)
3
(0.28)
4
(0.37)
5
(0.47)
6
(0.56)
7.5
(0.70)
9
(0.84)
10
(0.93)
15
(1.40)
20
(1.86)
25
(2.33)
30
(2.79)
40
(3.72)
50
(4.65)
20 (11) 10 10 15 20 20 25 30 35 50 65 80 100 130 160
40 (22) 15 20 30 35 40 50 60 65 100 130 160 195 260 320
60 (33) 20 30 45 50 60 75 90 100 145 195 240 290 385 480
80 (44) 30 40 55 65 80 100 115 130 195 260 320 320 515 640
100 (56) 35 50 65 80 100 125 145 160 240 320 400 400 640 800
120 (67) 40 60 80 100 115 150 175 195 290 385 480 480 770 960
140 (78) 45 70 90 115 135 175 205 225 340 450 560 560 900 1120
Uninsulated Enclosure Wattage Selection Table
Temperature TOTAL SURFACE AREA ft2 (m2)
F (C) 2
(0.19)
3
(0.28)
4
(0.37)
5
(0.47)
6
(0.56)
7.5
(0.70)
9
(0.84)
10
(0.93)
15
(1.40)
20
(1.86)
25
(2.33)
30
(2.79)
40
(3.72)
50
(4.65)
20 (11) 30 40 55 70 80 100 120 135 205 270 335 405 540 670
40 (22) 55 80 110 135 160 200 245 270 405 540 670 805 1075 1340
60 (33) 90 120 160 205 245 300 365 405 605 805 1005 1210 1610 2010
80 (44) 110 160 215 270 325 400 485 540 805 1075 1340 1610 2145 2680
100 (56) 135 200 270 335 405 500 605 670 1005 1340 1675 2010 2680 3350
120 (67) 165 240 320 405 485 600 725 805 1210 1610 2010 2415 3220 4020
140 (78) 190 280 375 470 565 700 845 940 1410 1880 2345 2815 3775 4690