Unfortunately, with HWS, we cannot tell when a valve or hot water system is going to go, until it goes. Most valves on a hot water system have a 1-year warranty and most hot water systems have approx. a 7-year warranty.
If your hot water system shows any signs of leaking, a dramatic change in temperature, rusty/discoloured water or makes noises when you use your hot water, give us a call.