In this video I’m talking about a problem I keep seeing with under-sink instant hot water setups—my InSinkErator instant hot water tank failed right around the 4-year mark, and I wanted to know why. I walk you through what happened, what symptoms to watch for (no heat, leaking, or just acting dead), and then I open the tank up to see what’s going on inside. From what I found, it sure looks like the heating element or internal components are the weak link, which lines up with that common 3–5 year lifespan a lot of homeowners report. I also go over the big question everyone asks: can you replace the heating element, or are you basically forced into replacing the whole tank? I talk through the repair vs. replace decision the way I look at it—time, cost, and how long you can realistically expect the next one to last. And before you spend money, I cover warranty stuff you should check so you don’t miss an easy claim. If your instant hot tank suddenly stopped heating or started leaking, this should save you time (and possibly money) before you order parts or a whole new system.