Discover Where to Install a Water Hammer Arrestor: A Comprehensive Guide

Water hammer is a common plumbing issue that can cause significant damage if left unresolved. If you’ve ever heard a loud banging noise after turning off a faucet or flushing a toilet, then you’ve experienced water hammer. In this article, we will explore what water hammer is, why it’s a problem, and how a water hammer arrestor can help alleviate the issue.

Understanding where to install a water hammer arrestor is crucial in preventing further damage to your plumbing system. Whether you’re a homeowner or a professional plumber, knowing how to identify the source of water hammer and where to install the water hammer arrestor can save you time, money, and frustration. So, let’s dive in and learn more about where to install water hammer arrestor this important topic.

Did you know that water hammer can generate pressures of up to 1000 pounds per square inch (psi)? This immense pressure can lead to pipe bursts and other plumbing failures if not addressed promptly.

The most important findings at a glance

  • Water hammer is a phenomenon that occurs in plumbing systems and can cause damage and noise.
  • To address water hammer, a water hammer arrestor can be installed in strategic locations.
  • The installation process involves turning off the water supply, attaching the arrestor, and testing the system.

where to install water hammer arrestor

1/8 What is Water Hammer?

The destructive force of water hammer can wreak havoc on your plumbing system . When the water flow abruptly halts or changes, it inflicts harm upon your pipes and appliances. Luckily, there exists a remedy known as water hammer arrestors.

Water hammer arrestors are ingenious contraptions that absorb the shockwaves caused by water hammer, acting as guardians for your pipes and appliances. Utilizing air chambers, they absorb the pressure surges resulting from sudden shifts in water flow. In turn, they ensure the durability and longevity of your plumbing system.

Devoid of water hammer arrestors, your pipes and appliances are left vulnerable to cracks and bursts, leading to exorbitant repairs and potential water damage. The cacophony and tremors produced by water hammer can also prove vexing and disruptive. To safeguard your plumbing system, it is imperative to strategically install water hammer arrestors .

They can be positioned near the main water shut-off valve, the entry point of the main water supply line, or in close proximity to the main plumbing manifold. Additionally, it is advisable to install them near water-utilizing appliances such as washing machines, dishwashers, and toilets for localized protection. In summary, the perils of water hammer are substantial, but water hammer arrestors possess the ability to avert costly repairs.

Invest in these devices to shield your plumbing system and relish uninterrupted water flow throughout your abode .

Oh, and if you’re wondering about crimp fittings on PEX A, check out this article “Can You Use Crimp Fittings on PEX A?” for all the details on whether it’s a compatible option for your plumbing needs.

where to install water hammer arrestor

2/8 Why is Water Hammer a Problem?

In the realm of plumbing, a menacing issue known as water hammer arises from unexpected shifts or halts in water movement. This phenomenon wreaks havoc on pipes and appliances, unleashing a cacophony of disruptive noise and unsettling vibrations. Yet, the true cause for alarm lies in the potential for pipe ruptures and the subsequent financial burden of repairs.

To safeguard against such calamities, the installation of water hammer arrestors proves invaluable. By absorbing the shock waves, these devices mitigate the perils linked to water hammer. Swiftly addressing this predicament is paramount to preserve the seamless operation of the plumbing system.

3/8 What is a Water Hammer Arrestor?

In the world of plumbing, there exists a small yet mighty hero known as the water hammer arrestor. This ingenious device serves a critical role in safeguarding our beloved plumbing systems from potential disaster. Imagine a scenario where sudden changes in water flow create a violent shockwave, capable of wreaking havoc on our pipes and appliances.

Enter the water hammer arrestor , with its air chambers designed to absorb these shockwaves and maintain stability. By doing so, it effectively prevents pressure fluctuations and eliminates the need for costly repairs. Installing this humble device is a simple yet powerful way to ensure the longevity of your plumbing system and grant you the peace of mind you deserve.

Don’t let water hammer strike fear into your heart – invest in a water hammer arrestor today and let tranquility flow through your pipes.

where to install water hammer arrestor

Everything You Need to Know About Water Hammer and Installing a Water Hammer Arrestor

  • Water hammer is a phenomenon that occurs when there is a sudden change in water flow or pressure in a plumbing system.
  • Water hammer can cause loud banging or knocking noises in the pipes, which can be disruptive and potentially damaging.
  • A water hammer arrestor is a device that helps alleviate the effects of water hammer by absorbing the shockwaves created by the sudden change in water flow.
  • Water hammer arrestors are typically installed at strategic points in the plumbing system to effectively reduce the impact of water hammer.
  • Common places to install a water hammer arrestor include near water-using appliances, near the water meter, and at strategic points in the plumbing system.
  • Installing a water hammer arrestor requires a few basic tools, such as a pipe wrench or adjustable pliers, and can usually be done by a homeowner.
  • To install a water hammer arrestor, you will need to turn off the water supply, attach the arrestor to the plumbing system, and then reconnect and test the system to ensure proper functioning.
  • Maintaining your water hammer arrestor is important to ensure its effectiveness. Regularly checking for leaks, cleaning the arrestor, and replacing it if necessary can help prolong its lifespan.

4/8 How Does a Water Hammer Arrestor Work?

Water hammer arrestors play a crucial role in safeguarding your plumbing system. By utilizing air chambers, they effectively absorb pressure caused by sudden water flow changes. This prevents any harm to your pipes and appliances.

In addition to protecting your plumbing , water hammer arrestors also contribute to a smoother and quieter water flow. They minimize the noise and vibrations associated with water hammer, ensuring a more peaceful environment. Without these essential devices, the force of abrupt water flow changes could result in burst pipes and costly repairs.

So, next time you encounter a loud banging noise in your plumbing system , remember the vital role played by water hammer arrestors. They utilize air chambers to absorb pressure and shield your pipes and appliances from potential damage.

5/8 Identifying the Source of Water Hammer

In the realm of plumbing systems, there exists a vexing problem known as water hammer , capable of wreaking havoc and causing extensive damage. To conquer this formidable foe, one must first embark on a quest to identify its origins. Sources of this affliction often include abrupt changes in water flow, sudden stoppages, and excessive water pressure .

In the domestic realm, signs of water hammer manifest as cacophonous noises, unsettling vibrations, and even the catastrophic bursting of pipes. Vigilance is key, for only through keen observation can one avert further destruction. To embark on this quest, one must meticulously inspect all valves and faucets within the confines of their dwelling, ever watchful for signs of commotion and tremors.

Alternatively, one may seek the guidance of a seasoned professional, a master of the plumbing arts, armed with specialized tools capable of unmasking the hidden culprit. Once the source of this malevolent water hammer has been unmasked, swift action must be taken to safeguard the delicate equilibrium of the plumbing system. This may necessitate the fine-tuning of water pressure, the installation of water hammer arrestors, or the undertaking of other necessary repairs.

where to install water hammer arrestor

Water Hammer Arrestor Placement Guide – Tabelle

Location Description Benefits
Near the dishwasher Installation near the dishwasher to absorb water hammer effects Prevents damage to dishwasher components and reduces noise
Close to the washing machine Installing a water hammer arrestor near the washing machine to mitigate water hammer Protects washing machine valves and hoses, increases appliance lifespan
Near the water heater Placement near the water heater to minimize water hammer impacts Reduces stress on water heater components, prevents leaks and noise
At the main water supply line Installing a water hammer arrestor at the main water supply line to prevent water hammer throughout the plumbing system Prevents damage to pipes, valves, and fixtures, improves overall system performance
Near individual fixtures Placement near individual fixtures, such as faucets and toilets, to address water hammer issues at specific locations Eliminates noise, protects fixtures from damage, and extends their lifespan

Close to Water-using Appliances

Water hammer has the potential to wreak havoc on your plumbing and appliances . To safeguard against this destructive force, it is crucial to have water hammer arrestors installed in close proximity to your water-reliant appliances such as washing machines, dishwashers, and toilets. These appliances are particularly susceptible to the abrupt changes in water flow brought about by water hammer.

By placing a water hammer arrestor near your washing machine, you can shield your pipes from undue stress and the risk of bursting. The same holds true for dishwashers, where water hammer can result in bothersome noise and unsettling vibrations. The installation of a water hammer arrestor in close proximity to your dishwasher will help mitigate these effects, ensuring a smoother and quieter operation.

Toilets are not exempt from the perils of water hammer, which can manifest as noise, vibrations, and even damage. By installing a water hammer arrestor near your toilet, you can prevent these issues and spare yourself the burden of costly repairs down the line. To sum it up, safeguard the well-being of your plumbing system and appliances by equipping them with water hammer arrestors.

This proactive measure will shield against damage, minimize noise and vibrations, and guarantee optimal functionality.

If you’re curious about the purpose and importance of weep holes in your shower, check out our article “Understanding Weep Holes in Shower” for all the information you need.

If you’re looking for an easy-to-understand visual guide, check out this informative diagram of toilet plumbing rough in that breaks down the process step by step.

Near the Water Meter

In the realm of safeguarding your plumbing system, there exists a pivotal action that must not be overlooked: the installation of a water hammer arrestor. This fundamental device possesses the extraordinary ability to absorb the ferocious pressures that course through your pipes, safeguarding them from imminent harm. Moreover, its presence serves as a guardian against the relentless vibrations that plague ordinary plumbing systems, ultimately prolonging the life of your cherished pipes.

By embracing this wise investment , you shall be spared the burdensome weight of exorbitant repairs that lie in your future. However, heed my counsel, dear reader, for the installation itself holds its own secrets. Ensuring a leak-free existence requires a harmonious alignment between the water hammer arrestor and your plumbing system.

As you embark upon this noble task, equip yourself with a trusty wrench to securely fasten the connections. And, should the winds of uncertainty prevail, consider the embrace of Teflon tape to bestow an extra layer of sealing. Thus, with a water hammer arrestor stationed near the water meter, the symphony of smooth water flow shall resonate within the sacred walls of your abode.

Let not the clamor of water hammer damage disrupt the tranquility that you so rightfully deserve.

where to install water hammer arrestor

How to Install a Water Hammer Arrestor and Eliminate Plumbing Noise

  1. Identify the source of water hammer in your plumbing system.
  2. Determine the appropriate location to install the water hammer arrestor.
  3. Gather the necessary tools for installation.
  4. Turn off the water supply to the affected area.
  5. Attach the water hammer arrestor to the plumbing system at the chosen location.
  6. Reconnect the water supply and test the system for any remaining water hammer issues.
  7. Maintain the water hammer arrestor regularly to ensure its effectiveness.

At Strategic Points in the Plumbing System

In order to avoid the damaging effects of water hammer in your plumbing system, it is crucial to strategically position water hammer arrestors . These devices act as pressure absorbers, shielding your pipes and appliances from harm. Here are some key considerations to keep in mind when installing water hammer arrestors: First and foremost, focus on installing them at the bends in your plumbing system.

These bends can disrupt the flow of water and increase the likelihood of water hammer . By placing a water hammer arrestor at these points, you can mitigate sudden changes in water flow and safeguard your plumbing system . Additionally, it is important to position water hammer arrestors near areas of high pressure within the plumbing system.

These areas often experience intense pressure surges, which can trigger water hammer. By having water hammer arrestors in close proximity, you can absorb the shock and prevent any potential damage. Lastly, give careful consideration to installing water hammer arrestors at intersections where multiple plumbing lines meet.

These intersections can create turbulence in the water flow, exacerbating the risk of water hammer. By installing water hammer arrestors at these junctures, you can minimize the risk and ensure a smoother water flow throughout your plumbing system. By strategically placing water hammer arrestors at these critical points within your plumbing system, you can effectively prevent water hammer and ensure the continued protection of your pipes and appliances.

Take the time to assess your plumbing system and install water hammer arrestors where they are most needed.

where to install water hammer arrestor

6/8 Tools You’ll Need

In order to successfully install a water hammer arrestor , it is essential to have the necessary tools at hand. Here are the key items you will need:

1. A wrench or pliers: These tools are crucial for securely fastening connections, ensuring a watertight seal and preventing any potential leaks or future issues.

2. Teflon tape: Wrap this tape around threaded connections to create a tight seal, effectively eliminating any possibility of leaks.

3. A pipe cutter or hacksaw: With either of these tools, you can easily cut the pipes to the desired length, allowing for a customized installation tailored to your specific plumbing system. By equipping yourself with these tools, you will be fully prepared to install the water hammer arrestor. Simply follow the step-by-step guide, align the arrestor correctly, tighten all connections, apply the Teflon tape, and remember to turn off the water supply.

Before beginning the installation of a water hammer arrestor, it is vital to ensure the water supply is turned off. This precautionary measure is essential to avoid potential leaks, water damage, and accidents during the installation process. Locate the main shut-off valve in your home, typically found near the water meter or where the main water supply line enters your property.

Utilize a wrench or pliers to securely close the valve. Neglecting to turn off the water supply can lead to severe consequences such as water hammer incidents, burst pipes, leaks, flooding, and expensive repairs. Prioritizing safety should always include turning off the water supply prior to any plumbing installation.

Did you know that water hammer can generate pressure spikes of up to 1000 pounds per square inch (psi)?


My name is Warren and I am a professional plumber licensed and insured in the State of California. I have been in the business for over 10 years and have undertaken small and large projects including bathroom renovation, toilets, garbage disposals, faucets, sinks and kitchen plumbing jobs. This site is based on my experience with toilets. I have installed the best brands and models in all sizes and shapes. I hope this helps you with the unbiased information that you need to make the right decision. …weiterlesen

Attach the Water Hammer Arrestor

Ensuring a secure and leak-free installation is essential for the effective functioning of a water hammer arrestor. Use a wrench to tighten the connections and apply Teflon tape for added sealing. These steps will safeguard your plumbing system from water hammer damage, keeping it in top-notch condition.

where to install water hammer arrestor

Reconnect and Test the System

Once the water hammer arrestor is installed, it is crucial to reconnect and test the system to ensure its efficiency. Begin by checking the water flow, turning on the supply and observing its smooth and uninterrupted flow. Any issues such as low pressure or inconsistent flow may indicate installation or plumbing problems.

Next, carefully inspect the system for leaks or unusual noises. Examine all connections, joints, and fittings for signs of water leakage, no matter how small. Address any leaks immediately to prevent further complications.

Furthermore, listen for banging or rattling sounds that could be a sign of water hammer or other plumbing issues. Finally, thoroughly test all fixtures and appliances. Ensure that each faucet, showerhead, toilet, and other water-using appliances are functioning as expected.

Watch out for any signs of malfunction, such as dripping faucets or toilets that continue to run after flushing. By diligently reconnecting and testing the system, you can guarantee optimal water flow, identify and address leaks or abnormal noises, and ensure that all fixtures and appliances are in excellent working condition. This will provide you with the reassurance that your water hammer arrestor installation was successful and that your plumbing system is operating flawlessly.

Water hammer arrestors are essential for preventing damage to plumbing systems. In this video, we explore the crucial question of where these devices should be installed to effectively mitigate water hammer. Find out the best locations to ensure reliable protection in your home.

YouTube video

7/8 How to Maintain Your Water Hammer Arrestor

Regular maintenance is essential for keeping your water hammer arrestor in top shape. Here are some simple steps to ensure its effectiveness:

1. Regularly check for any leaks or drips. Look out for any visible signs of water leakage around the connections and fittings.

If you notice any leaks , it’s crucial to address them immediately to prevent further damage to your plumbing system.

2. Periodically flush the water hammer arrestor to remove any sediment buildup. This will help maintain its efficiency and prevent any potential blockages .

3. Inspect the connections and fittings for signs of corrosion. Corrosion can weaken the system and impact its functionality. If you spot any rust or discoloration, take immediate action.

This may involve replacing corroded parts or seeking assistance from a professional plumber . By diligently following these maintenance steps, you can keep your water hammer arrestor in optimal condition and prolong the lifespan of your plumbing system.

where to install water hammer arrestor

8/8 Common Problems and Solutions

Water hammer, a frustrating problem in plumbing systems, can be easily solved. Excessive water pressure is often the culprit, leading to loud banging noises and vibrations. To remedy this, install a pressure reducing valve to regulate the water pressure and prevent excessive force.

Loose pipe fittings can also contribute to water hammer by causing vibrations. Ensure all fittings are tightly secured using a wrench or pliers to address this issue. Waterlogged air chambers can also trigger water hammer.

These chambers are designed to absorb pressure, but when filled with water, they lose their effectiveness. To rectify this, shut off the main water supply and open the faucets to drain the water from the air chambers, restoring their ability to absorb pressure. By tackling these common issues and implementing the necessary solutions, you can bid farewell to water hammer in your plumbing system.


In conclusion, understanding water hammer and its effects is crucial for maintaining a well-functioning plumbing system. By installing a water hammer arrestor in the appropriate location, you can effectively mitigate the damaging effects of water hammer and ensure a steady water flow throughout your home. This article has provided a comprehensive guide on what water hammer is, why it is a problem, how a water hammer arrestor works, and where to install it.

We have also discussed the step-by-step installation process and provided tips for maintenance and troubleshooting. By following this guide, you can effectively address water hammer issues and prolong the lifespan of your plumbing system. For more helpful articles on plumbing maintenance and repair, we recommend exploring our other resources on related topics.


Can a water hammer arrestor be installed in any position?

You can install these arrestors either vertically or horizontally, and it is recommended to place them within a 6 ft. distance from the fixture or valve that is causing the noise. This helps to effectively reduce the noise and ensure proper functioning of the system.

How far can a hammer arrestor be from a fixture?

For distances of 20ft or less, it is recommended to install one arrester within 6ft from the end of the run. However, for distances greater than 20ft, it is advised to place an arrester at the end of each 20-foot section, within 6ft of the end of that specific section. This helps ensure proper protection against electrical surges throughout the entire length of the run.

Can water hammer arrestors be installed in wall?

All the water hammer arrestors displayed in the image are suitable for sealed wall installations, eliminating the need for an access panel.

Should a water hammer arrestor be upstream or downstream?

Install the arresters within 6 feet upstream of the sprinkler valves, as close as possible. Avoid placing them on the main line that feeds the house. Make sure to select the appropriate size: use a type B arrester for a 3/4″ line and a type C arrester for a 1″ line. If these specific sizes are not readily available, consider special ordering them or visiting a plumbing supply store to obtain them.

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