cabinet enclosure heater

How to size a Cabinet Enclosure Heater

Finding a cabinet enclosure heater does not have to be a game of “trial and error.” The importance of protecting your electronics isn’t something you should mess around with. An improperly sized cabinet enclosure heater can damage your electrical components and cost you in repairs. Depending on what’s in the cabinet, it can cause larger problems.

Cabinet Enclosure Heater Sizing

Start with the surface area – Measure  the height, width, and depth of your enclosure. Find the Surface Area  by: Surface Area = 2(length*width + length*height + width*height).

Find the temperature differential –  by

First  figuring out the lowest temperature your cabinet will experience where it is located (ambient temp).

Then you need to figure out what the desired operating temperature is for your enclosure. With these two numbers, you can figure out the temperature differential by subtracting the ambient temperature from the desired temperature.

 

Determining Wattage Requirements for Enclosure Heaters

 

Temperature Rise from Minimum Expected Ambient Temperature to Desired Enclosure Temperature (oF)
20 40 60 80 100 120 140
Enclosure Surface Area – Square Feet 50 670 160 1340 320 2010 480 2680 640 3350 800 4020 960 4690 1120
40 540 130 1075 260 1610 385 2145 515 2680 640 3220 770 3755 900
30 405 100 805 195 1210 290 1610 385 2010 480 2415 580 2815 675
25 335 80 670 160 1005 240 1-340 320 1675 400 2010 480 2345 560
20 270 65 540 130 805 195 1075 260 1340 320 1610 385 1880 450
15 205 50 405 100 605 145 805 195 1005 240 1210 290 1410 340
10 135 35 270 65 405 100 540 130 670 160 805 195 940 225
9 120 30 245 60 365 90 485 115 605 145 725 175 845 205
7.5 100 25 200 50 300 75 400 100 500 125 600 150 700 175
6 80 20 160 40 245 60 325 80 405 100 485 115 565 135
5 70 20 135 35 205 50 270 65 335 80 405 100 470 115
4 55 15 110 30 160 45 215 55 270 65 320 80 375 90
3 40 10 80 20 120 30 160 40 200 50 240 60 280 70
2 30 10 55 15 90 20 110 30 135 35 165 40 190 45
Required wattage – Double above values in areas with extreme wind factors.uninsulated cabinet                       insulated cabinet
Match above values from chart to a standard Enclosure Heater. Use multiple heaters where necessary.

 

Why You Need to Get it Right

Many enclosures, especially those located outside -, are prone to moisture and condensation. Moisture is the bane of all electronic components. Your enclosure heater needs -to be sized correctly to keep your components dry without overheating. – the proper wattage -will ensure the proper heating occurs throughout the cabinet. -.

 

Speak to a Professional at Heatrex

All you need is the surface area of your cabinet and the heat differential. Add in a few of the other details about your cabinet, and a professional can tell you what kind of heater will work best for you. Of course, if you already know precisely the size and wattage of the heater you require, then go ahead and choose one of the high quality heater enclosures from Heatrex.

Sizing your cabinet enclosure heater can become complex. If you are unsure, you can contact a professional.

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