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If some installation instructions came with the water heater which tell you what kind of wire to use, the same instructions should also tell you how to connect the wires to the water heater. <><><>

As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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Q: Tankless water heater that calls for a 10-3 wire you bought a 10-3 but the heater only has hookups for 3 wires Which wires go on the heater and what do you do with the extra wire?
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