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What size wire do I need for a 40 gallon electric water heater?

If you want your water heater to run efficiently, we recommend wiring it with a larger wire size than the current requirement. A 20-amp water heater requires a 12-gauge wire, a 25-amp water heater requires a 10-gauge wire, and a 30-amp or 40-amp water heater requires an 8-gauge wire.
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