STEP 1:

See the color chart of North America to find the average incoming water temperature in your region.

Choose your inlet ground water temperature:

STEP 2:

Look at the chart for the applications that call for hot water and much water they use per minute or ( GPM) , base on the applications you plan on running at one time your water heater must heat that much water per minute.

Note: Average Hot Water Temp is 105°F-115°F. To get your temperature rise take your desired hot water temp minus the incoming water temp = temp rise. Example: 107°F desired hot water – 57°F inlet = 50°F temperature rise.

Recommended PRODUCT:

Model:
IR-30
Power (KW):
3.4kW
Voltage (V):
120VAC
Breaker Sized (A):
30 Amp Single Pole
Recommended Electrical Service:
100 Amp
Wire Size (AWG):
10
Model:
IR-245
Power (KW):
4.5 kW
Voltage (V):
220VAC
Breaker Sized (A):
20 Amp Double Pole
Recommended Electrical Service:
100 Amp
Wire Size (AWG):
12
Model:
IR-260
Power (KW):
6kW
Voltage (V):
220VAC
Breaker Sized (A):
30 Amp Double Pole
Recommended Electrical Service:
100 Amp
Wire Size (AWG):
10 (x2)
Model:
IR-288
Power (KW):
8.8kW
Voltage (V):
220VAC
Breaker Sized (A):
40 Amp Double Pole
Recommended Electrical Service:
100 Amp
Wire Size (AWG):
8 (x2)
Model:
SIO 14
Power (KW):
14 kW
Voltage (V):
220VAC
Breaker Sized (A):
(2 x 30 Amp)
Recommended Electrical Service:
200 Amp
Wire Sized:
(#10 (2 Sets)
Model:
SIO 18
Power (KW):
18 kW
Voltage (V):
220VAC
Breaker Sized (A):
(2 x 40 Amp)
Recommended Electrical Service:
200 Amp
Wire Sized (AWG):
(#8 (2 Sets)