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I think you first need to figure out what size waterheater you need, then see what your amp rating is for that waterheater. Typicall Waterheater is usually rated for 30amps 240volts

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15y ago

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In North America the standard sizes for breakers are 15, 20, 30, and 40 amps. The 15 amp size breaker is used in general circuit wiring. The 20 amp size breaker is used for dedicated appliance receptacles, hot water tank and baseboard heating. The 30 amp size breaker is used for a clothes dryer. The 40 amp size breaker is used for the electric range.


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