That's really not all that bad. At a typical rate of 10 cents/KWh that's only about $1.5 per hour to run. Since it only runs when hot water is in use, I suspect most household would use well under 1 hour of hot water a day (10-30 minutes for showers, another < 5 minutes for a laundry, < 5 minutes for a dishwasher,+ misc use).
You don't have any teen-aged daughters, do you?
I really don't mean this as a troll, but, really, do Teacher's colleges (or Education departments) really teach anything significant at all? I was an undergraduate 40 years ago and education majors were not exactly considered the brightest on campus then and, as far as I can tell, still aren't (from my kids in college).
Personally, I believe that when women with intelligence could become anything they wanted, the teaching profession lost its most reliable source of decent practitioners. I hasten to add that I don't think we should turn the clock back on that, but it would be nice if teaching attracted more of the highly competent women that now go into business or other professions. How to do that is another issue and there are serious cultural as well as financial problems to overcome here.
And yes, I will plead guilty to holding the probably sexist notion that intelligent women are better at handling younger children (say before middle school, at least) than equally intelligent men, on average. That's just the way it is (in my not so humble opinion).
Hitler claimed to be a christian. Mao and Stalin killed people for 'the greater good' or something like that. I'm actually hard pressed to find any incidents where a bunch of atheists killed people for being religious.
If anything Hitler was against Christianity, but felt that the time to deal with Christians was to be left to a time well after the other "lesser races" were dealt with. There clearly was anti-Christian bias in some of the letters and writings of Hitler, and a sort of psuedo-religious cult that came up in the form of Nazism that transcended Christianity.
Certainly the anti-Jewish sentiment in Nazism was not grounded in Christianity, but rather in something far more profound and a sort of religion in its own right.
As for being hard-pressed to look for any incident where a bunch of avowed atheists have explicitly killed those harboring religious beliefs as their only "crime"? I don't think you have looked hard enough. Millions have died at the hands of atheists, or at least governments that have sought explicitly to purge religious thought. Both Mao and Stalin were involved in that killing, and both professed official atheism. It wasn't merely "the greater good", but that was indeed the rationale. It also involved more than just these two men.
Even today in China, if you tried to open a church or express your religious beliefs in a public manner without formal state approval you will get arrested and possibly even killed on the spot for what in most "western" nations would be considered a non-violent protest. I'm not talking twenty or forty years ago, I'm talking today. People are still being killed today in the name of atheism, or because they don't disavow their religious beliefs.
Scientists will study your brain to learn more about your distant cousin, Man.