Q: I had to turn off the water supply valve at the top of my water heater. So I turned it, but it kept on turning and turning without shutting off the water. A neighbor of mine said it is a gate valve ...

Relegated to a closet or a basement corner, a water heater lives a secluded life of quiet service, and its warning signs often go unheeded. For example, when enough sediment collects on the bottom of ...