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Enclosure Heating

Many outdoor enclosures – such as those for ATMs, temperature controllers, gauges and sensor boxes, and portable testing equipment – contain electronics that are at risk of shorting out from condensation or becoming inoperable when condensation inside the machine freezes.

Several kinds of heaters can warm the air in the enclosure to prevent this damage. The most common and space-effective are silicone rubber heaters, which you can order from stock or configure to order on our site. Others include finned strip heaters and tubular heaters. You can buy these heaters online at the pages below:

Wattage Calculator

The wattage of the heater you need is determined by the total surface area of your enclosure and the temperature rise you need to produce. You can use this calculator to find the wattage you need.

Step 1: Find your enclosure's total surface area by entering its dimensions here.

Units Length Width Height

Imperial

Metric

in.cm in.cm in.cm
Total surface area: ? ft²

Step 2: Find your temperature rise – that is, the difference between your minimum and maximum temperature – and enter it below to see the wattage you'll need to heat your enclosure. Note that uninsulated surfaces require a much higher wattage of heat than insulated surfaces; for cost-efficacy, we almost always recommend insulating your enclosure.

Wattage required for insulated enclosures

Temp. rise

°F°C

Total surface area (ft²)
2 3 4 5 6 7.5 9 10 15 20 25 30 40 50
20°F 10 10 15 20 20 25 30 35 50 65 80 100 130 160
40°F 15 20 30 35 40 50 60 65 100 130 160 195 260 320
60°F 20 30 45 50 60 75 90 100 145 195 240 290 385 480
80°F 30 40 55 65 80 100 115 130 195 260 320 320 515 640
100°F 35 50 65 80 100 125 145 160 240 320 400 400 640 800
120°F 40 60 80 100 115 150 175 195 290 385 480 480 770 960
140°F 45 70 90 115 135 175 205 225 340 450 560 560 900 1120
Wattage required for uninsulated enclosures

Temp. rise

°F°C

Total surface area (ft²)
2 3 4 5 6 7.5 9 10 15 20 25 30 40 50
20°F 30 40 55 70 80 100 120 135 205 270 335 405 540 670
40°F 55 80 110 135 160 200 245 270 405 540 670 805 1075 1340
60°F 90 120 160 205 245 300 365 405 605 805 1005 1210 1610 2010
80°F 110 160 215 270 325 400 485 540 805 1075 1340 1610 2145 2680
100°F 135 200 270 335 405 500 605 670 1005 1340 1675 2010 2680 3350
120°F 165 240 320 405 485 600 725 805 1210 1610 2010 2415 3220 4020
140°F 190 280 375 470 565 700 845 940 1410 1880 2345 2815 3775 4690