The temperature pressure relief valve, or TPR valve, is a water heater’s fail safe for the high pressures it can generate. When pressure builds in a 30-gallon water heater due to a broken TPR valve, it can explode with the force of two pounds of dynamite.
Experts report one-third of all water heater TPR valves are not operational because of mineral buildup, rust, or corrosion. Test yours every six months.
The TPR valve is that little lever on top or the side of your water heater. If it won’t budge with normal hand pressure, tap it lightly with a hammer to loosen it up.
If it leaks, open and close it several times to dislodge any debris. If you can’t stop the leak, replace it.