Ground screw
Junction
Conduit 
box cover connector 
Wire connections
Water heater junction box.
CAUTION: The presence of water in the piping and water heater does not provide sufficient conduction for a ground.
Electrical Connections
A separate branch circuit with copper conductors, overcurrent protective device and suitable disconnecting means must be provided by a qualified electrician.
All wiring must conform to local codes or latest edition of National Electrical Code ANSI/NFPA 70.
The water heater is completely wired to the junction box inside jacket at the top front of the water heater. An opening for 1/2″ or 3/4″ electrical fitting is provided for field wiring connections.
The voltage requirements and wattage load for the water heater are specified on the rating plate on the front of the water heater.
The branch circuit wiring should include either:
Metallic conduit or metallic sheathed cable approved for use as a grounding conductor and installed with fittings approved for the purpose.
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
Total Water | Recommended Over Current Protection | Copper Wire Size AWG Based | ||||||||
Heater Wattage | (fuse or circuit breaker amperage rating) | on N.E.C. Table | ||||||||
| 120V |
| 208V |
| 240V | 120V |
| 208V |
| 240V |
|
|
|
|
| ||||||
1500* | 20 |
| 15 |
| 15 | 12 |
| 14 |
| 14 |
1700 | 20 |
| 15 |
| 15 | 12 |
| 14 |
| 14 |
2000 | 25 |
| 15 |
| 15 | 10 |
| 14 |
| 14 |
2500 | 30 |
| 15 |
| 15 | 10 |
| 14 |
| 14 |
3000 | 35 |
| 20 |
| 20 | 8 |
| 12 |
| 12 |
3500 | – |
| 25 |
| 20 | – |
| 10 |
| 12 |
3800 | – |
| 25 |
| 20 | – |
| 10 |
| 12 |
4000 | – |
| 25 |
| 25 | – |
| 10 |
| 10 |
4500 | – |
| 30 |
| 25 | – |
| 10 |
| 10 |
5000 | – |
| 30 |
| 30 | – |
| 10 |
| 10 |
5500 | – |
| 35 |
| 30 | – |
| 8 |
| 10 |
6000 | – |
| 40 |
| 35 | – |
| 8 |
| 8 |
9000 | – |
| – |
| 50 | – |
| – |
| 8 |
*Less than 1500 watts may be wired 14 gauge with 15 amp protection. Check Local Electrical Codes, as they will also apply.
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