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Reference Data
Quick Estimates of
Wattage
Requirements
Kilowatt-Hours to Heat Water ©
Amount of Liquid
Temperature Rise °F
Gallons
20°
40°
60°
80°
100°
120°
140°
Kilowatts to Heat in One Hour
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
3.7
2.0
13
0.8
1.6
2.4
3.2
4.0
4.8
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
4.0
5.3
6.7
8.0
9.3
4.0
30
1.6
3.2
4.8
6.4
8.0
9.6
12.0
5.3
40
2.1
4.0
6.4
8.5
11.0
13.0
15.0
6.7
50
2.7
5.4
8.0
10.7
13.0
16.0
19.0
8.0
60
3.3
6.4
9.6
12.8
16.0
19.0
22.0
9.4
70
3.7
7.5
11.2
15.0
19.0
22.0
26.0
10.7
80
4.3
8.5
13.0
17.0
21.0
26.0
30.0
12.0
90
5.0
10.0
14.5
19.0
24.0
29.0
34.0
13.4
100
5.5
11.0
16.0
21.0
27.0
32.0
37.0
16.7
125
7.0
13.0
20.0
27.0
33.0
40.0
47.0
20.0
150
8.0
16.0
24.0
32.0
40.0
48.0
56.0
23.4
175
9.0
18.0
28.0
37.0
47.0
56.0
65.0
26.7
200
11.0
21.0
32.0
43.0
53.0
64.0
75.0
33.7
250
13.0
27.0
40.0
53.0
67.0
80.0
93.0
40.0
300
16.0
32.0
47.0
64.0
80.0
96.0
112.0
53.4
400
21.0
43.0
64.0
85.0
107.0
128.0
149.0
66.8
500
27.0
53.0
80.0
107.0
133.0
160.0
187.0
© Read across in table from nearest amount in gallons of liquid to desired temperature rise column and note kilowatts to heat in one hour.
For Heating Flowing Water:
kW = GPM XTemperature Rise (°F) X 0.16 OR
kW = Liters/min. X Temperature Rise (C) X 0.076
For Heating Water in Tanks: Use equation or table. kW = Gallons X Temperature Rise (°F)
375 X Heat-up Time (hrs)
OR
kW= Liters XTemperature Rise (C) 790 X Heat-up Time (hrs)
Kilowatt-Hours to Heat Air
Temperature Rise °F
If
Air CFM
50° 100° 150° 200° 250° 300° 350° 400° 450° 500° 600°
100
1.7
3.3
5.0
6.7
8.3
10.0
11.7
13.3
15.0
16.7
20.0
200
3.3
6.7
10.0
13.3
16.7
20.0
23.3
26.7
30.0
33.3
40.0
300
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
60.0
400
6.7
13.3
20.0
26.7
33.3
40.0
46.7
53.3
60.0
66.7
80.0
500
8.3
16.7
25.0
33.3
41.7
50.0
58.3
66.7
75.0
83.3
100.0
600
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
120.0
700
11.7
23.3
35.0
46.7
58.3
70.0
81.7
93.3
105.0
116.7
140.0
800
13.3
26.7
40.0
53.3
66.7
80.0
93.3
106.7
120.0
133.3
160.0
900
15.0
30.0
45.0
60.0
75.0
90.0
105.0
120.0
135.0
150.0
180.0
1000
16.7
33.3
50.0
66.7
83.3
100.0
116.7
133.3
150.0
166.7
200.0
1100
18.3
36.7
55.0
73.3
91.7
110.0
128.3
146.7
165.0
183.3
220.0
1200
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
180.0
200.0
240.0
Use the maximum anticipated airflow. This equation assumes insulated duct (negligible heat loss). 70°F inlet air and 14.7 psia.
For Air:
Use equation or table.
kW= CFM® X Temperature Rise (°F) 3000
OR
kW= Cubic Meters/Min® XTemperature Rise (°C) 47
kW = CFM® x Density© X Temperature Rise (°F) 228
OR
kW= Cubic Meters/Min© XTemperature Rise (C) X Density (kg/m3)©
575
® Measured at normal temperature and pressure.
© Measured at heater system inlet temperature and pressure.
430
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