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How much electrical energy (in kWh) is needed to heat the water in a well-insulated electric hot water heater of capacity 40 gal from 20

How much electrical energy (in kWh) is needed to heat the water in a well-insulated electric hot water heater of capacity 40 gal from 20^oC to 50^oC (68^oF to 122^oF)

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