If the TPR activates, you should shut off the valve immediately and contact a professional plumber for repair and assistance. Therefore, a leak from the TPR valve indicates the need for a replacement. Activation and LeakageĪ fully functioning TPR valve ejects powerful jets of hot water out of the discharge pipe when it’s fully activated. Never possess a threaded connection at the termination of the pipe to prevent capping.Be piped differently from other water heater pans, relief valve discharge, or equipment drains piping to the end of discharge.Discharge to the ending point that’s observable by occupants.Discharge in a way that doesn’t lead to property or structural damage.Discharge in a way that doesn’t lead to scalding.Never terminate above 152 mm (6 inches) above the waste receptor or floor.Be piped to an indirect waste receptor first through the air gap.Discharge through visible air gaps available in the same room as water-heating appliances.Discharge to the outdoors, an indirect waste receptor or floor drain. Never be trapped because standing water can be contaminated and flow back into potable water.Be as straight and short as possible to prevent undue stress of valves.Never decrease in size from the valve to the point of discharge (air gap).Never be smaller compared to the actual diameter of the pipe outlet valve it is supposed to serve.Non-approved plastics and PVC should never be used since they are prone to melting. Be designed and developed from approved materials, including copper, polyethylene, CPVC, stainless steel, polypropylene, and galvanized steel.Requirements of Discharge PipesĪll discharge pipes must meet some basic requirements. This article will concentrate on the TPR discharge and focus more on the three different options: copper, CPVC, and PEX. If you want to prevent such a situation from ever happening, there is a need to install a TPR discharge pipe and must consider the best option. TPR valves without a discharge pipe could release scalding hot water causing bodily injury. The TPV valve releases pressure inside the tank to prevent water heaters from exploding. In case they malfunction, the water in the tank could get superheated. TPRs are temperature and pressure sensors and safety devices. PVC piping or plastic tubing is unsuitable for a discharge pipe due to the scalding water temperatures. TPR discharge pipes are required to be made of copper, CPVC, or PEX pipe. Water heater manufacturers state that a TPR discharge pipe is required to direct hot water to the exterior or a suitable drain location. A correctly installed TPR discharge pipe directs this scalding water to discharge to a safe location to the exterior or drain location. TPRs are made to automatically release water if the temperature or pressure inside the tank exceeds safe levels. When the TPR valve opens, scalding water is released from the tank. When installing a water heater, you must install the TPR discharge pipe per manufacturer guidelines.Ī TPR (Temperature and pressure-relief) is installed on water heaters, such as tank water heaters and boilers. Temperature and pressure relief, aka TPR valves, are essential safety features in water heaters.
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