!
DANGER: Elements should only be replaced with an element of the same power rating
that was factory installed, and corresponds to the rating label on the unit.
NOTICE: This guide recommends minimum branch circuit sizing and wire size based on National Electric Code. Refer to
wiring diagrams in this manual for field wiring connections.
Branch Circuit Sizing and Wire Size Guide
Single Phase
Wiring
Total Water
Heater Wattage
Recommended Over Current
Protection Copper (fuse or circuit
breaker amperage rating)
Wire Size AWG Based on N.E.C.
Table 310-16 (75°C)
120V
240V
120V
240V
2,000
20
----
12
----
3,000
----
20
----
12
3,800
----
20
----
12
4,500
----
25
----
10
11
Wiring Diagrams
SINGLE ELEMENT
2
1
2
THERMOSTAT
& HIGH TEMP.
LIMIT (ECO)
HEATING
ELEMENT
WHITE
YELLO
W
BLA
CK
H
JUNCTION
BO
X
N
1
G
*
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
2
1
2
THERMOSTAT
& HIGH TEMP.
LIMIT (ECO)
HEATING
ELEMENT
BL
UE
YELL
OW
BLA
CK
L1
G
*
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
JUNC
TION
BO
X
4
L2
RED
1
3
SINGLE ELEMENT
DOUBLE ELEMENT
YELLO
W
LOWER
HEATING
ELEMENT
2
UPPER THERMOSTAT
& HIGH TEMP.
LIMIT (ECO)
UPPER
HEATING
ELEMENT
BLUE
YELLO
W
BLA
CK
L1
JUNCTION
BO
X
4
L2
RED
1
3
1
2
BLA
CK
RED
LOWER
THERMOSTAT
1
2
4
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
G
*
240 Volt
120 Volt
240 Volt
