UPDATE:
The inlaws came to stay the past few days. Here are the numbers.
3.5 days
5 extra people + me and wife = 7 people
6 loads of laundry with wash on the warm water setting
4 dish washer loads
and about 9-11 showers a day
plus what ever hot water was used for normal sink dishes/hand washing.
Results:
17kwh
.11 cents per kwh
total of $1.87
divided by 3.5 days = .54 cents a day
pretending that this was for a normal family of 7 people full time this unit should use .54 cents x 31 days = $16.74 or 365 days x .54 cents = $197.10 for hot water all year for a large family of 7 people.
The bore hole temp never dropped below 36F even though the compressor ran for 13-14 hours a day.
