House size really not something that would factor in as the estimate would be for the same available BTU.
It may factor in on the number of units necessary to achieve a comfortable temp in various areas of the home... but that would be an on-site assessment variable to each.
I can prebuy oil, but not electricity. $2.899 is what I'm at.
But what I noticed was a friend using the same system but choosing to heat with wood only save about 100 gallons... maybe 150 this year due to the longer duration of the cold spell.
The rest of what we used was for heating water and standby when the water was to be heated but not used.
My home may be better insulated than his... but the heated space is about the same along with the number of occupants.
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