I understand electricity usage... But water "usage"? The water is not used, heat is transferred to the water, and then it is available again, right? Am I missing something? Is the heat the big problem? Why do we call it "usage"? Is it actual tap-water that could have been put to other use?
Water that had some heat transferred to it sounds like perfectly well usable water, right...?
Water that had some heat transferred to it sounds like perfectly well usable water, right...?