Even new wiring of the proper size might not be enough because your electric service might not have enough capacity for a central electric tankless wh.
Tankless water heater wiring.
The water heater should not have wiring coming out of it for splicing.
Here is the spec sheet and your unit is a 13kw.
Electrical wiring and circuit requirements for a tank less water heater a tankless water heater will require a dedicated circuit as specified by the installation manual of the unit that has.
If you need additional space in the panel for the circuit breaker then a quad circuit breaker may be.
This electrical wiring project is about how to connect the wires from the circuit breakers to a ecosmart 18 tankless water heater.
How to install a tankless water heater.
You cannot use an electric tankless water heater in place of an electric tank without a significant upgrade in wiring and most probably adding new breakers to make a total of two or three breakers.
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With the white wire coming from the panel wrap electrical tape over its insulation to identify it as a current carrying line this should also be done at the breaker as well.
Simply locate the appropriate water heater sizes on ecomfort using your information.
Then connect it to the other wire from the water heater just as you did the black wire.
Wire connections for a ecosmart 18 tankless water heater.
There should be terminals on the bottom of the unit which would accept a minimum of 6 gauge wire 240 volt coming from a 60 amp double pole breaker.
Tankless water heater maintenance.
I bought an ecosmart 18 tankless water heater.
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This is definitely a job for a pro as it involves making leak free water vent and gas connections in the case of gas or propane units or upgrading the wiring and circuit breaker panel in the case of electric units.
Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home.