Sizing Guide

Simple Formula Ensures Proper Size
of Eemax Tankless Electric Water Heater
28
82 kW 123 kW
27
79 kW 119 kW
26
76 kW 114 kW
25
73 kW 110 kW
24
70 kW 105 kW
23
67 kW 101 kW
22
64 kW 97 kW 129 kW
21
62 kW 92 kW 123 kW
20
59 kW 88 kW 117 kW
19
56 kW 84 kW 111 kW
18
53 kW 79 kW 105 kW 132 kW
17
50 kW 75 kW 100 kW 125 kW
16
47 kW 70 kW 94 kW 117 kW
15
44 kW 66 kW 88 kW 110 kW 132 kW
14
41 kW 62 kW 82 kW 103 kW 123 kW
13
38 kW 57 kW 76 kW 95 kW 114 kW
12
35 kW 53 kW 70 kW 88 kW 105 kW 123 kW
11
32 kW 48 kW 64 kW 81 kW 97 kW 113 kW 129 kW
10
29 kW 44 kW 59 kW 73 kW 88 kW 103 kW 117 kW 132 kW
9
26 kW 40 kW 53 kW 66 kW 79 kW 92 kW 105 kW 119 kW 132 kW
8
23kW 35 kW 50 kW 59 kW 70 kW 82 kW 94 kW 105 kW 117 kW 129 kW
7
20 kW 31 kW 41 kW 51 kW 62 kW 72 kW 82 kW 92 kW 103 kW 113 kW
6
18 kW 26 kW 35 kW 44 kW 53 kW 62 kW 70 kW 79 kW 88 kW 97 kW
5
15 kW 22 kW 29 kW 37 kW 44 kW 51 kW 59 kW 66 kW 73 kW 81 kW
4
12 kW 18 kW 23 kW 29 kW 35 kW 41 kW 47 kW 53 kW 59 kW 64 kW
3
9 kW 13 kW 18 kW 22 kW 26 kW 31 kW 35 kW 40 kW 44 kW 48 kW
2
6 kW 9 kW 12 kW 15 kW 18 kW 21 kW 23 kW 26 kW 29 kW 32 kW
1
3 kW 4 kW 6 kW 7 kW 9 kW 10 kW 12 kW 13 kW 15 kW 16 kW
0.5
2 kW 2 kW 3 kW 4 kW 4 kW 5 kW 6 kW 7 kW 7 kW 8 kW
20°F 30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F
TOTAL GALLONS PER MINUTE (GPM) DEMAND
FLOW CHART POWER REQUIRED – KW
RISE IN TEMPERATURE °F
FORMULAS
Flow Rate (GPM) = kW rating x 6.83
rise in temp (°F)
Rise in Temp (°F) = kW rating x 6.83
  owrate
kW Rating = GPM x rise in temp
6.83
A tankless water heater creates hot water on demand. You need a proportional amount of energy or (kW) to heat the
flow or (GPM) you need for your application. The chart below will help you determine the correct electric tankless water
heater, based on flow rate (GPM) and temperature rise.
For additional product specifying needs, contact Eemax Support at [phone] or email [e-mail].