In my experience, they spring a leak rather than just stop making hot water. Perhaps that is no longer true, but I do not wait for them to break before replacing them.
If it was a new furnace or a new a/c unit, I can see that would be a selling point. I'm not sure how much people think about water heaters, maybe it's different where you live.
I have a heating a cooling company that I trust in these matters, they installed an AO Smith model a couple of years ago, and it's fine. If you call those Emergency Hot Water companies, you will get something you might not like. YMMV, just my experience.
I hope it's fixed soon. Good luck.
nancy