This is the 3rd unit since 2010. I get about 3 years of everyday use before the tank leaks. The first replacement unit was covered under warranty but was explained by the “warranty dept” that the next replacement would have to be installed by a Professional Plumber. So a few months ago the Replacement tank started to leak (3years) again. Instead of paying for a plumber I felt I would purchase a whole new unit with a new warranty. All done and works well. I opened the external covering on the tank to find excessive rust and corrosion around the seam for the two halves that make the water tank. I believe this is a poor design. I think it should be made of stainless steel With stainless steel hardware and not have a seam in the middle. Should be a tank and a cover. If this one goes I will look into other alternatives. My wife use it all day, everyday.