Old one is leaking onto the floor, so I need to replace it fast. This is the new one and the delivery guy self-signed and left before I could talk to him.
The product description says it has a glass-lined tank. Could the glass coating have been damaged?
I would err on the side of caution and send this back. You'll have to go without hot water for a few days, but it's better than installing this just find it didn't work, or worse blow your house up.