@saab,
yeh, maybe AC is the departure.
We also use gas or oil to heat water but most of ours are tank systems where the water heating goes on 24/7 whether or not we use the hot water.
I think in Germany or Scandanavia (Im guessing) you use tankless technology.
Weve switched over a few years ago and it saved us about 25 to 30% in our fuel bills