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Assuming you are referring to a 240 volt residential hot water heater you will need to install 10/2 NM cable (Romex) with ground from the service panel to the water heater wired to a 30 amp circuit breaker in the service panel. If you cannot see the water heater from the service panel you will need to install a service disconnect at the water heater.

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13y ago

The breaker size for a hot water tank is dependant upon the wattage of the tank. Most common households water tanks will be run on a two conductor #12 wire and the breaker protecting that size of wire is a two pole 20 amp breaker. This size will be used on a tank with wattage's up to 3840 watts.

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Q: What size amp circuit breaker should be used for a hot water tank?
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