<a href=showthread.php?s=&postid=6543430#post6543430 target=_blank>Originally posted</a> by chucksta1
Allow me to muddy the waters..
Frist law of thermodynamics:
Heat is light and light is heat.
Therefore all heat produced by your tank ( and there is an absolute conversion rate in BTU's ) will result in a lowering of the energy costs associated with heat. If the electrical cost has risen by $75.00 , then the cost of heating the dwelling must have dropped.
G'won, ask for your rebate, I dare 'ya.
Seriously. if the house isn't heated by electricity, what was last December's usage in Kilowatt hours? What's this December's? If all other things are equal, the only difference would be from the tank.