A malfunctioning TPR valve is as dangerous as one that isn't there, and if you haven't checked the one on your water heater ...

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 va ...

The other way to create a closed system is to have a pressure regulator installed that contains a built-in check valve. With either of these installed, water can't leave the house.

Signs of a Leaking Drain Valve. Water on the floor at the water heater’s base is a sure sign of a leak. The water might be coming from the temperature and pressure relief valve (T&P valve), though.