 asked in category: General Last Updated: 20th April, 2020

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

A water heater of this type is required to be considered a continuous load meaning that the branch circuit needs to be calculated at 125% of the heater's rated ampacity. 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

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20th April, 2020

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