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Sarahama
Your water heater's rating of 4773 kwh/year would indicate that you might use around 400 kwh/month and at say.. $0.10/kwh you would be spending $40/month and for a normal family that's about right. You should expect more like $20 - $25/month. There is no question that something else is drawing current through your water heater's breaker. I agree that you should turn it off for a longer period to ensure that your theories all check out. When your water heater cuts in it will draw enough current to be to make your bill $500/month but it's actually off 90% of the time. So you doo need to test with everything else off for a long stretch.
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