I don't have one and I don't install them but I can tell you they are not what their hype would have you believe. If you are in a cold climate (winter) you will probably not have really hot water. Tankless require frequent cleaning and service which is not cheap. They require mega amounts of power, either gas or electric, and most homes do not have a gas line or electrical service large enough to provide the power and increasing either of them is expensive. When the cost of the tankless and installation is figured in, most studies have shown tankless are not anywhere near the cost saver that they are touted to be. You can search the archives of this forum and read what others have reported yourself, but I would suggest you do a great deal of research and study before you go the tankless route. It's too bad they aren't that good yet, maybe someday they will be but for now, I'd run the other way.