Assume an average ground water temperature of 60°F and you need to heat it up 50°F to 110°F.
That is 415BTUs per gallon.
Each gallon should take about 1/12 of a kwh or about 1 cent worth of power, maybe a little more to heat each gallon of water.
Then you have to have 200 amp service to run a whole home electric tankless water heater. If you don't have 200 amp service and 6 open breaker panel spots it could cost you thousands of dollars to upgrade electrical service.
Do you not have natural gas service?
Compared to natural gas it costs something like 0.24 cents per gallon, if gas is $5 per therm.
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