**No, it is not okay**. You will be building in a potential fire hazard. If a thermostat in your electric water heater fails, energizing both the upper and lower heating elements, your water heater’s current draw will continuously exceed #12 AWG NM-B wire’s 20 amp rating.

## Can I use 12 2 wire on my hot water heater?

**Electric hot water tanks require a wire size of 12 gauge AWG**. This wire is rated for up to 20 amps of current. Most 120 volt electric water heater use a maximum of 15 amps 120 volt.

## Can you use 12 wire on a 30 amp breaker?

**You should not use a 30-amp circuit breaker on a 12-gauge wire**. The circuit breaker installed on a circuit is of a specific size to protect a certain wire gauge. A larger breaker on a thinner wire will allow more current over the wire before tripping.

## Will a 12 2 wire carry 30 amps?

**Yes, based on the National Electric Code or NEC, you can use 12-2 AWG cables for THHN or THWN-rated wires**. These cables are made for general purposes and can hold up to 194 degrees without taking any damage. It simply means these wires can withstand the heat temperature drawn by a 30 amp circuit breaker.

## Can you use a 30 amp breaker for a water heater?

Electric water heaters require a dedicated 240-volt dedicated 30-amp circuit and a 10-2 non-metallic (NM) or MC cable. This means the breaker only powers the water heater and no other appliances. **A 30-amp circuit breaker can power all 4500watt water heaters regardless of gallon size**.

## How many amps will 12 2 wire carry?

Maximum Breaker Size is 30 amps. You can use a **20 amp** circuit breaker with 12/2 Romex as 12/2 wire is rated for 20 amps. Always remember THE BREAKER IS THERE TO PROTECT THE WIRE NOT THE APPLIANCE !!!

## What wire do you use for 30 amps?

For a maximum of 30 amps, you’ll need a **wire gauge of 10**. The most common household item that requires a 30 amp circuit is a central air conditioner.

## What kind of breaker do I need for a water heater?

30-amp

Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a **30-amp double-pole breaker** and 10-2 non-metallic (NM) or MC cable.

## What size breaker do I need for my hot water heater?

The breaker size has always been calculated by **dividing the total wattage by voltage**. So to know what size breaker for a 4500-watt water heater, we need to divide 4,500 by 240. The answer to this is the exact figure you get when you convert 4500 watts to amps: 18.75.

## What size breaker should a hot water heater be on?

30-amp breaker

An electrical water heater typically uses a **30-amp** breaker, so something like the Q230 30-Amp Double Pole Type QP Circuit Breaker will do the work well.

## How many amps does a 30 gallon water heater use?

The branch circuit needs to be calculated at 125% of the rated ampacity for this type of water heater to be considered a continuous load. In order to work on a 20 Amp OCPD, you will need a **25 or 30 Amp** circuit.

## What size wire would you run for a 30 amp breaker connected to a electric water heater?

Electrical wires

Since the generic breaker size for water heaters is 30-amps, the best wire size is a **#10 American Wiring Gauge (AWG)**.