Temperature and pressure relief, aka TPR valves, are essential safety features in water heaters. When installing a water heater, you must install the TPR discharge pipe per manufacturer guidelines. Show
A TPR (Temperature and pressure-relief) is installed on water heaters, such as tank water heaters and boilers. 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. A correctly installed TPR discharge pipe directs this scalding water to discharge to a safe location to the exterior or drain location. Water heater manufacturers state that a TPR discharge pipe is required to direct hot water to the exterior or a suitable drain location. TPR discharge pipes are required to be made of copper, CPVC, or PEX pipe. PVC piping or plastic tubing is unsuitable for a discharge pipe due to the scalding water temperatures. TPRs are temperature and pressure sensors and safety devices. In case they malfunction, the water in the tank could get superheated. The TPV valve releases pressure inside the tank to prevent water heaters from exploding. TPR valves without a discharge pipe could release scalding hot water causing bodily injury. 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. This article will concentrate on the TPR discharge and focus more on the three different options: copper, CPVC, and PEX. Requirements of Discharge PipesAll discharge pipes must meet some basic requirements. A discharge pipe must:
Activation and LeakageA fully functioning TPR valve ejects powerful jets of hot water out of the discharge pipe when it’s fully activated. Therefore, a leak from the TPR valve indicates the need for a replacement. If the TPR activates, you should shut off the valve immediately and contact a professional plumber for repair and assistance. Inspectors make recommendations for the testing of TPR valves at least every month. However, inspectors should do this themselves. The best thing they can do is explain to the homeowners where the main water supply can be located and how it can be disconnected. TPR Data Plate InformationHere are some things you should know about the data plate:
Even though the chances of a TPR valve being activated are closer to zero, it’s still a critical safety component on domestic water heaters and boilers. Guidelines involving the discharge pipes and valves reflect real hazards that all home inspectors and homeowners must consider seriously. Fixing Leakages in Temperature Pressure Relief ValvesWhen you find your TPR valve malfunctioning, you might have to make a quick replacement. Managing a replacement is simple, and in most cases, you can even do it yourself. Follow the steps below to achieve this:
Comparing Labor Costs of Different Types of TPR Discharge PipesFor the past 30 years, copper has been the dominant discharge pipe used in at least 80% of home constructions. However, CPVC has seen steady growth in the last few years. CPVC is popular with do-it-yourselfers and remodelers since it doesn’t involve soldering pipes and sweating. Each type of TPR discharge pipe comes with its advantages, disadvantages, and purpose. But, in most cases, the main difference between PEX and CPVC comes down to how familiar you’re with materials and the plumbing functionality and materials that you’re after. You employ either copper, PEX, or CPVC tubing without experiencing significant problems. However, you should ensure that they’re installed by someone familiar with their best practices. To enable you to come up with an enlightened decision on which option is the best fit for you, we’ll explore each material and illustrate the ups and downs. CPVC for PlumbingLike we have seen above, CPVC piping is the best option for do-it-yourselfer and remodelers. The option has been around for over 40 years now. It’s rated for temperatures of at least 140 degrees. This piping option is very safe to use, just like copper piping. The good thing about CPVC is that it can handle high amounts of heat and has a high resiliency. CPVC has a different and unique outer diameter compared to PEx and copper. It is something that you should consider while planning your connections. CPVC is also easy to install and highly lightweight compared to copper. This piping option has a lower cost compared to copper. It can be attributed to the cost of metals increasing over the past few years. Pros of Using CPVC
Considerations When using CPVCYou should note that CPVC:
All national building codes approve the use of CPVC in Canada and the United States to carry potable water. In addition, quality control standards and extensive testing have been established to ensure that these products are manufactured with consistency. Copper Piping OptionFor a long time, copper piping has been referred to as the workhorse product of the United States. The use of copper has been around since the 1920s. By the 1980s, copper for water piping purposes was more than half a billion linear feet each year. As a result, copper piping offers one of the best solutions for commercial and home piping, provided that you keep the supplied water near a pH of 7. However, many people have raised the challenge of pinhole leaks. Pinhole leaks that result from corrosion inside the pipes occur in most older homes in cases where the supply lines are horizontal. The pipe walls are therefore disrupted in a non-uniform fashion. The leading causes of pinhole leaks include high pH, excessive flow rates, and water softeners. Pros of Copper Option
Cons of Copper Option
Although there are no listed side effects of copper piping, the EPA lists copper among metals that contaminate drinking water. In addition, older copper installations might have higher levels of lead which is poisonous. PEX TubingPEX tubing also means cross-linked polyethylene. It’s the fancy approach of illustrating the process through which the plastic pipe is made. What cross-linking does is create a link between the polymer chains. Manufacturers employ three methods to manufacture PEX piping: PEX A, B, and C. There is an extrusion process that heats the material under high pressure. The tubing is eventually pulled out through a die. PEX tubing has been used since the 1980s strictly for commercial purposes. However, many installers prefer using PEX due to its flexibility and can run for long distances in a single run. It, therefore, saves more time during installation compared to CPVC and copper. Why Should You Use PEX TubingOne of the main reasons PEX is preferred among most people is that it can operate in a wide range of temperatures. The range can be from below-freezing temperatures to above 180 degrees Fahrenheit. As a result, it makes PEX the ideal solution for cold and hot potable water hydronic radiant floor heating systems, service lines, and supply lines. PEX can penetrate the slab and be installed under the slab with only a sleeve. The piping runs in home-run configuration, which involves cold and hot runs directed from a single source to a destination tap, fixture, and spigot. To modify or repair the fixture, you need to shut down one line. Plumber working on PEX piping can save time since they are easier and quicker to install. In addition, installation can be managed using either compression-style or mechanical fittings. When you install PEX piping correctly, they’re expansion tolerant and highly durable. ConclusionFrom what we have seen above, CPVC comes out on top as the most reliable TPR discharge pipe. In addition, it stands out for being straightforward and cost-effective. PEX piping comes second and becomes less expensive when you eliminate the expenditure on tools. Copper piping is the most expensive option. However, there are some homeowners and pros who consider copper a premium high-end solution. In our own opinion, we would go for PEX if we were creating our own homes and building new constructions. However, when it comes to older homes, we convert all copper to CPVC where possible. Therefore, we only use copper to save energy and time converting to CPVC and vice versa. However, it would be best to understand that there is no wrong answer in the copper vs. PEX vs. CPVC debate. You need to find the perfect material for yourself and your plumber. We hope that this guide illustrates the variables involved in deciding the perfect approach for you. Where should pressure relief valve discharge pipe drain to?be first piped to an indirect waste receptor such as a bucket through an air gap located in a heated area when discharging to the outdoors in areas subject to freezing, since freezing water could block the pipe. not terminate more than 6 inches (152 mm) above the floor or waste receptor.
Does a water heater temperature valve need a discharge tube?The Temperature & Pressure Relief Valve or TPR Valve on any heated appliance that contains water, such as a heating boiler, hot water tank, water heater, water cylinder, must have a drain line or discharge tube properly installed, routed, and made of proper materials.
Can you use PVC for the T&P discharge piping?The T&P discharge pipe must be rated for hot water; PVC pipe is not hot water rated and must not be used as a T&P discharge pipe. PVC pipe is only cold water rated and can melt or burst if used for pressurized hot water.
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