Serve a single relief device and shall not connect to piping serving any other relief device or equipment.Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air gap.Discharge through an air gap located in the same room as the water heater.Not be directly connected to the drainage system.The discharge piping serving a pressure relief valve, temperature relief valve or combination thereof shall: Properly Installed Temperature/Relief Valve & Discharge Tubeīy the way, here are the code requirements for discharge tubing in Florida: See the image below for a perfect installed discharge tube connected to a TPR Valve. So, it is possible a slow drip of the TPR valve will collect water in the tubing and ultimately rust out the valve rather than empty it to the floor. Therefore, extremely hot water should discharge to the ground for safety.Īdditionally, if a pipe were to go up, water will have to work against gravity to empty. This is because hot water will come out of the TPR valve as it releases water. This tube should be aimed straight to the ground and never go up. The Discharge TubeĪs seen in the featured image, a TPR valve is required to have a discharge pipe/tube. Luckily for us, the water heater has many safety mechanisms that help protect us from an explosion and the TPR valve is one of them. Since heated water expands, the water heater can become a ticking time bomb if we were to continually build pressure in your water heater. The valve functions by releasing water if your water heater becomes too pressurized. This valve is typically on the top or side of your water heater. The TPR valve, also called, a pressure relief valve is a specialized valve at your water heater. So what is the TPR valve, why does it leak, and what should you do about it? What Is The Temperature Pressure Relief Valve (TPR) The water heater temperature-pressure relief valve (TPR Valve), protects us from this high heat and pressure. The water heater is known for its high heat and high pressure.
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