We have used these instant hot water heaters for many years. Before the tanks were made from stainless steel, they would last only somewhat longer than their warrantee then spring a leak. Then we got one with a stainless steel tank that lasted almost ten years. We replaced it with the same model but that one lasted only 5 months before the heater died. We got a replacement under warrantee easily. We'll see how long this one lasts. But, there is no comparable product so we are hoping the previous problem was a quirk. These instant hot water heaters are convenient and useful. We really like them and depend on them. Very useful product.