Electric Heaters - Quick Estimates of Wattage Requirements
For Heating Flowing Water:
kW = GPM x Temperature 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 x Temperature Rise (°C)
790 x Heat-up Time (hrs.)
1 Cu. Ft. = 7.49 Gallons
Kilowatt-Hours to Heat Water*
| Amount of Liquid |
Temperature Rise °F |
| ft3 |
Gallons |
20° |
40° |
60° |
80° |
100° |
120° |
140° |
| Kilowats to Heat in One Hour |
0.66
1.3
2.0
2.7
3.3 |
5
10
13
20
25 |
0.3
0.5
0.8
1.1
1.3 |
0.5
1.1
1.6
2.2
2.7 |
0.8
1.6
2.4
3.2
4.0 |
1.1
2.1
3.2
4.3
5.3 |
1.3
2.7
4.0
5.3
6.7 |
1.6
3.2
4.8
6.4
8.0 |
1.9
3.7
5.6
7.5
9.3 |
4.0
5.3
6.7
8.0
9.4 |
30
40
50
60
70 |
1.6
2.1
2.7
3.3
3.7 |
3.2
4.0
5.4
6.4
7.5 |
4.8
6.4
8.0
9.6
11.2 |
6.4
8.5
10.7
12.8
15.0 |
8.0
11.0
13.0
16.0
19.0 |
9.6
13.0
16.0
19.0
22.0 |
12.0
15.0
19.0
22.0
26.0 |
10.7
12.0
13.4
16.7
20.0 |
80
90
100
125
150 |
4.3
5.0
5.5
7.0
8.0 |
8.5
10.0
11.0
13.0
16.0 |
13.0
14.5
16.0
20.0
24.0 |
17.0
19.0
21.0
27.0
32.0 |
21.0
24.0
27.0
33.0
40.0 |
26.0
29.0
32.0
40.0
48.0 |
30.0
34.0
37.0
47.0
56.0 |
23.4
26.7
33.7
40.0
53.4
66.8 |
175
200
250
300
400
500 |
9.0
11.0
13.0
16.0
21.0
27.0 |
18.0
21.0
27.0
32.0
43.0
53.0 |
28.0
32.0
40.0
47.0
64.0
80.0 |
37.0
43.0
53.0
64.0
85.0
107.0 |
47.0
53.0
67.0
80.0
107.0
133.0 |
56.0
64.0
80.0
96.0
128.0
160.0 |
65.0
75.0
93.0
112.0
149.0
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.
413 Market Street, Newark, NJ 07105 • Tel: 973-589-4876 • Fax: 973-589-6922 • 800-631-8830