##### Asked by: Dalmiro Tumbakov

asked in category: General Last Updated: 20th April, 2020# How many amps does a 30 gallon water heater use?

**4500/240**=

**18.75 amps**, will work on a

**20 amp**OCPD but,

**18.75***125% = 23.4 amps, requires a 25 or 30 amp circuit.

Thereof, what size breaker should be used for a water heater?

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.

Beside above, how many amps does a 20 gallon water heater pull? A **20**-**amp** circuit **would** be the required size to operate the **water heater**. This is determined by an Ohm's law electrical formula: watts divided by voltage equals **amps**. I'll even **do** the math for you. Divide 3,800 watts by 240 volts to determine that you'll need 15.83 **amps** to operate your **water heater**.

Correspondingly, how many amps does a 40 gallon water heater use?

So a 16 amp heater should be wired and protected by a 20amp circuit or a **20 amp** breaker should only feed a max of 16 amp load. Bottom line, For a 4500w heater w/240v it will draw **4500/240** or **18.75 amps** so #10 wire and either 25 or **30 amp** breaker, depending on code.

How many amps is 4500 watts?

18.75 amps