I would be curious to know the difference in heating. It would be very hard to prove, but i would argue that a small % of the total heat given off is actually absorbed by the water compared to dissipated in the air in the room. this is simply a guess, and like i said, would be difficult to test. the difference between the two without the heat changes is 4.08kwh per day @ $0.085 per kwh (as per my last power bill), is only 10$ a month.
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