I have one and love it.....I had a water heater in the attic and constantly obsessed over it overflowing and ruining my house. I decided to get a new one and relocate it to the garage but the guy from Mobile Gas talked to me about the tankless water heater and I love it!!!! Low water bills and low gas bills. I would highly recommend it; in fact, since I got mine several of my neighbors have also gotten them.
My water can get too hot if I don't adjust the faucets properly, but my plumber said not to worry and that the units are very energy efficient. My bills reflect his statement.
Leni