PRV overflow could result in cold water dripping out of the overflow to relieve the geyser from excess pressure as water is heated and due to expansion that occurs as a result of heating. PRV can also leak when a major influx of water pressure is experienced from outside. To protect the property piping or geyser, the valve will open and discharge the excess pressure experienced. TP Valve discharge will discharge hot water in the event of a faulty thermostat, as the element is constantly heating the water. The TP valve discharge will be a metallic pipe able to withstand scolding temperatures and direct the overheated water to the outside in an attempt to prevent the geyser from bursting. The TP valve, thermostat and element must then all be replaced in some cases to ensure all parts affected are in safe working order especially if they were faulty for an extended period of time. This is a serious safety feature that must be incorporated on all geyser installations.