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  • Common Wattage Requirements

    Kilowatt-Hours to Heat Steel

    Amount of Steel (lb) Temperature Rise °F
    50° 100° 200° 300° 400° 500° 600°
    Kilowatts to Heat in One Hour
    25 0.06 0.12 0.25 0.37 0.5 0.65 0.75
    50 0.12 0.25 0.5 0.75 1 1.25 1.5
    100 0.25 0.5 1 1.5 2 2.5 3
    150 0.37 0.75 1.5 2.25 3 3.75 4.5
    200 0.5 1 2 3 4 5 6
    250 0.65 1.25 2.5 3.75 5 6.25 7.5
    300 0.75 1.5 3 4.5 6 7.5 9
    400 1 2 4 6 8 10 12
    500 1.25 2.5 5 7.5 10 12.5 15
    600 1.5 3 6 9 12 15 18
    700 1.75 3.5 7 10.5 14 17.5 21
    800 2 4 8 12 16 20 24
    900 2.25 4.5 9 13.5 18 22.5 27
    1000 2.5 5 10 15 20 25 30
    • Read across in table from nearest amount in pounds of steel to desired temperature rise column and note kilowatts to heat in one hour.
    • Includes a 40 percent safety factor to compensate for high heat losses and/or low power voltage

     

    Kilowatt-Hours to Heat Oil

    Amount of Oil Temperature Rise °F
    Cubic Feet Gallons 50° 100° 200° 300° 400° 500°
    0.5 3.74 0.3 0.5 1 2 2 3
    1 7.48 0.5 1 2 3 4 6
    2 14.96 1 1 2 4 6 11
    3 22.25 2 3 6 9 12 16
    4 29.9 2 4 8 12 16 22
    5 37.4 3 4 9 15 20 25
    10 74.8 5 9 18 29 40 52
    15 112.5 7 14 28 44 60 77
    20 149.6 9 1 37 58 80 102
    25 187 11 22 46 72 100 127
    30 222.5 13 27 56 86 120 151
    25 252 16 31 65 100 139 176
    40 299 18 36 74 115 158 201
    45 336.5 20 40 84 129 178 226
    50 374 22 45 93 144 197 252
    55 412 25 49 102 158 217 276
    60 449 27 54 112 172 236 302
    65 486 29 58 121 16 255 326
    70 524 32 62 130 200 275 350
    75 562 34 67 140 215 294 375
    • Read across in table from nearest amount in gallons of liquids to desired temperature rise column and note kilowatts to heat in one hour
    • Add 5 percent for uninsulated tanks

     

    Kilowatt-Hours to Heat Water

    Amount of Oil Temperature Rise °F
    Cubic Feet Gallons 20° 40° 60° 80° 100° 120° 140°
    0.66 5 0.3 0.5 0.8 1.1 1.3 1.6 1.9
    1.3 10 0.5 1.1 1.6 2.1 2.7 3.2 3
    2 3 0.8 1.6 2.4 32 4 4 5.6
    2.7 20 1.1 2.2 3.2 4.3 5.3 6.4 7.5
    3.3 25 1.3 2.7 4 5.3 6.7 8 9.3
    4 30 1.6 3.2 4.8 6.4 8 9.6 12
    5.3 40 2.1 4 6.4 85 11 13 15
    6.7 50 2.7 5.4 8 10.7 13 16 19
    8 60 3.3 6.4 9.6 12.8 16 19 22
    9.4 70 3.7 7.5 11.2 15 19 22 26
    10.7 80 4.3 8.5 13 17 21 26 30
    12 90 5 10 14.5 19 24 29 34
    13.4 100 5.5 11 16 21 7 32 37
    16.7 125 7 13 20 27 33 40 47
    20 150 8 16 24 32 10 48 56
    23.4 175 9 18 2= 37 47 56 65
    26.7 200 11 21 32 43 53 64 75
    33.7 250 13 27 40 53 67 80 93
    40 300 16 32 47 64 80 96 112
    53.4 400 2 43 64 85 107 128 149
    66.8 500 27 53 80 107 133 160 187
    • Read across in table from nearest amount in gallons of liquid to desired temperature rise column and note kilowatts to heat in one hour.

     

    Kilowatt-Hours to Heat Air

    Amount of Air CFM Temperature Rise °F
    50° 100° 150° 200° 250° 300° 350° 400° 450° 500° 600°
    100 1.7 3.3 5 6.7 8.3 10 11.7 13.3 15 16.7 20
    200 3.3 6.7 10 13.3 16.7 20 23.3 267 30 33.3 40
    300 5 10 15 20 25 30 35 40 45 50 60
    400 6.7 13.3 20 26.7 33.3 40 46.7 53.3 60 66.7 80
    500 8.3 16.7 25 33.3 41.7 50 58.3 66.7 75 83.3 100
    600 10 20 30 40 50 60 70 80 90 100 120
    700 11.7 3.3 35 46.7 58.3 70 81.7 93.3 105 116.7 140
    800 13.3 26.7 40 53.3 66.7 80 93.3 106.7 120 133.3 160
    900 5 30 45 60 75 90 105 120 135 150 180
    1000 16.7 33.3 50 66.7 83.3 100 116.7 133.3 150 166.7 200
    1100 18.3 36.7 55 73.3 91 110 128.3 146.7 165 183.3 220
    1200 20 40 60 80 100 120 140 160 180 200 240
    • Use the maximum anticipated airflow. This equation assumes insulated duct (neglible heat loss).
    • 70°F inlet air and 14.7 psia

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