1 gallon of water weighs 8.34 pounds. It takes I BTU to change the temp of 1 pound of water 1 degree F. So for 1 gallon it takes 8.34 BTU. It takes 3412.14 BTU to equal 1 KWH. So 8.34 Btu x (1KWH / 3412.14 BTU) = 0.002444 KWH
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0.6726
1 Mwh = 1000 Kwr
To raise the temperature of one cc of water requires i calorie of heat . you did not specify the volume.
New energy star models are about 470 kWh per year.
KWH