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Electric Heater Formulas
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Conversion
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1 KW = 3413 BTU
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Load Requirement
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| KW = |
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CFM x Temp. Rise
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3160
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Line Current (1 Phase)
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Line Current (3 Phase)
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| Amps = |
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KW x 1000
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Volts x 1.73
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Applied vs. Rated KW Factors
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Rated
Voltage |
Applied Voltage |
| 120 |
208 |
220 |
230 |
240 |
277 |
440 |
460 |
480 |
| 120 |
1.00 |
3.00 |
3.36 |
3.67 |
4.00 |
5.33 |
13.44 |
14.69 |
16.00 |
| 208 |
.33 |
1.00 |
1.12 |
1.22 |
1.33 |
1.77 |
4.47 |
4.89 |
5.32 |
| 220 |
.30 |
.89 |
1.00 |
1.09 |
1.19 |
1.58 |
4.00 |
4.37 |
4.76 |
| 230 |
.27 |
.82 |
.91 |
1.00 |
1.09 |
1.45 |
3.66 |
4.00 |
4.36 |
| 240 |
.25 |
.75 |
.84 |
.92 |
1.00 |
1.33 |
3.36 |
3.67 |
4.00 |
| 277 |
.19 |
.56 |
.63 |
.69 |
.75 |
1.00 |
2.52 |
2.76 |
3.00 |
| 440 |
.07 |
.22 |
.25 |
.27 |
.30 |
.40 |
1.00 |
1.09 |
1.19 |
| 460 |
.07 |
.20 |
.23 |
.25 |
.27 |
.36 |
.91 |
1.00 |
1.09 |
| 480 |
.06 |
.19 |
.21 |
.23 |
.25 |
.33 |
.84 |
.92 |
1.00 |
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1. Locate Heater Rated Voltage.
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2. Locate Actual Applied Voltage.
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3. Multiply Heater Rated KW by Factor Shown to Obtain Actual KW Capacity
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