We had a competitors instant hot water heater for about 18 years, worked great. We replaced the old unit with the HWT-F1000S as part of a major kitchen remodel in 2016. Everything was great until tank started leaking. Had to buy a new tank as it was out of warranty. The new tank was very easy to install. Hoping we get better longevity out of the replacement. I was very disappointed that a product this expensive would have such a short life.