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How many amps is a 40 gallon water heater?

A 20amp circuit or a 20amp breaker should only feed a max of 16amp load, because a 16amp heater should be wired and protected by a 20amp circuit. Depending on the code, a 2500w heater w/240v will draw 2500/240 or 18.75 Amps and either 25 or 30 Amps.Thus, a 16-amper heater must be connected and protected by a 20-amper circuit or a 20-amper circuit breaker must only provide a maximum load of 16 ampers. Base line, For a 4500w w240v 450240 or 18.75 ampers heater port only 10 cables and 25 or 30 ampers circuit breakers, depending on the code.

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