What size of wire to use for electric water heater?

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Leila Zieme asked a question: What size of wire to use for electric water heater?
Asked By: Leila Zieme
Date created: Wed, Jun 23, 2021 1:29 AM
Date updated: Thu, Jun 23, 2022 11:42 AM

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Top best answers to the question «What size of wire to use for electric water heater»

  • Wire a hot water heater with wire that's sized to accommodate the heater's current requirement. For example, a 20-amp hot water heater needs 12-gauge wire, a 25-amp hot water heater requires 10-gauge wire, and a 30- to 40-amp hot water heater requires 8-gauge wire.

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It is important to match the wire size to the correct breaker or fuse. The breaker protects the wire from overheating. You can use 10 gauge wire for lower wattage water heaters. If you are running wire for a new water heater, it is a good idea to use 10 gauge so that you are covered for any water heater you might buy in the future.

I agree with you that this water heater circuit is not a typical configuration, and the common circuit for a new home is #10 copper wire protected by a 2pole 30amp circuit breaker, however lets look at this application carefully. First, lets start with the NEC Code for this Water Heater Application

Because your water heater runs on 240 volts, it also requires a double-pole circuit breaker. This CB type has two live wires. If a problem occurs in one of the wires, it also trips the other to cut off electricity to the water heater. How to Determine the Correct Breaker Size for Your Water Heater

The typical 240 volt water heater has a red and black wire located in a junction box at the top of the water heater. The incoming circuit wires and the water heater wires are normally black and red, and are splices or connected together, color to color using red or gray wire nuts.

Likewise, what wire do I use for an electric water heater? Electric hot water heaters typically require a dedicated 30-amp, 240-volt breaker. The wire supplying power from the breaker panel to your water heater will usually be a 10/2 Romex cable (Blk wire- hot, Marked White wire - hot, Bare copper wire - ground).. Secondly, what size wire do I need for a 4500 watt water heater?

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