I had a new electric water heater installed by a licensed plumber (sorry, not DIY). After only a few months it has started to leak slowly out of the bottom element. I tightened the element with a special wrench and it did get tighter, but the leak persists.
My question is should the plumber be responsible for repairing this? The leak has nothing to do with his workmanship, which was great, but he did supply the heater. The plumber is not a large company, he just works for himself. The invoice doesn't say anything about a warranty for his labor.