I planning to buy a house need to do a lot of work. House is small. The closet where the water heater is small. I was talking to some friends they told me which "tankless electric water heater". Say it would save you energy on the bill. Just avoid the propane all together. I don't know any about kw or anything of that nature.just need a straight fact. If so which one on home Depot or Lowe's is good and energy saving?