We are installing 2 double pole 40 amp breakers for an electric tankless hot water heater, into our 200 amp panel. Is that going to use 80 amps or 160 amps?


Assuming you are in the USA, this will allow up to 80 amps @ 240 volts, out of the 200 amps available.


The draw will be less than 80 amps, code limits the breaker size to 60 amps with the current draw at a max of 48a NEC 424.22 so multiple breakers are used the wattage of the heater will provide the maximum demand that the heater will use.

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