If the tankless heater has wires then that is odd.
Rheem tankless water heater wiring.
I am more concerned about the difference between what your house wiring currently supplies and what the heater requires.
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This electrical wiring project is about how to connect the wires from the circuit breakers to a ecosmart 18 tankless water heater.
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All pros listed are independent dealer owned.
Wire connections for a ecosmart 18 tankless water heater.
Wires to the tankless water heater reviewing the electrical question.
If you need additional space in the panel for the circuit breaker then a quad circuit breaker may be allowed as specified by the make and model of the panel.
A tankless water heater will require a dedicated circuit as specified by the installation manual of the unit that has been selected.