I don't have one, but I want one. I want one sooo bad. They work by heating the water on demand. The water passes through heated tubies or something in the small box you mount on the wall. It does not store water like a traditional water heater, so you never have to worry about it bursting, it heating water you're not using, or the little flame going out. From what I understand, by not heating water constantly, you save money. Also, you never run out of hot water because it is heated on demand, as needed.
at 9:29 AM on Oct. 19, 2009