Can tankless water heaters cause water hammer?

If you’re considering upgrading to a tankless water heater, you may be wondering if it can cause water hammer. Water hammer is a common plumbing issue that occurs when a sudden change in water flow or pressure causes pipes to vibrate, producing a loud banging or knocking sound. In this article, we’ll explore everything you need to know about water hammer, whether tankless water heaters can cause it, and how to prevent and address this issue.

Introduction: Understanding Water Hammer and Its Causes

Water hammer is a plumbing issue that occurs when a sudden change in water flow or pressure causes pipes to vibrate and produce a loud banging or knocking sound. This sound can be annoying, and if left untreated, it can lead to pipe damage and leaks.

Water hammer is caused by several factors, including:

• Sudden valve closure: When a valve is closed suddenly, water flow stops abruptly, causing a shockwave to travel through the pipes.
• High water pressure: High water pressure can increase the force of water flowing through the pipes, leading to water hammer.
• Loose pipes: Loose pipes can vibrate more easily, exacerbating the effects of water hammer.

Now that we understand the causes of water hammer, let’s explore whether tankless water heaters can cause this issue.

Can Tankless Water Heaters Cause Water Hammer?

Tankless water heaters are less likely to cause water hammer than traditional water heaters, as they do not rely on a storage tank to store and heat water. However, they can still cause water hammer if not installed and maintained properly.

One of the main causes of water hammer with a tankless water heater is high water pressure. Tankless water heaters require a minimum incoming water pressure of 20-30 PSI to operate correctly, and if the pressure is too high, it can cause water hammer. Additionally, if the unit is not installed properly, loose pipes can exacerbate the issue.

How to Prevent Water Hammer with a Tankless Water Heater

Preventing water hammer with a tankless water heater requires taking specific steps to regulate water pressure and minimize sudden valve closures. Here are some ways to prevent water hammer with a tankless water heater:

Install an Air Chamber

An air chamber is a vertical pipe that’s installed near the water shut-off valve. The air chamber allows air to compress, absorbing the shockwave and preventing it from traveling through the pipes.

Install a Water Hammer Arrestor

A water hammer arrestor is a device that absorbs the shockwave created by sudden valve closures. It’s installed on the water supply line and acts as a cushion, preventing the shockwave from traveling through the pipes.

Regulate Water Pressure

Regulating water pressure is crucial to preventing water hammer. You can install a pressure-reducing valve to regulate the water pressure coming into your home.

Addressing Water Hammer with a Tankless Water Heater

If you’re experiencing water hammer with your tankless water heater, there are several steps you can take to address the issue:

Check for Loose Pipes

Check for loose pipes near the tankless water heater and secure them if necessary. Loose pipes can exacerbate the effects of water hammer, so ensuring all pipes are securely fastened can help minimize the issue.

Insulate Pipes

Insulating pipes can help reduce the impact of water hammer by minimizing vibrations. You can use foam pipe insulation to wrap around the pipes near the tankless water heater.

Call a Professional Plumber

If you’re unable to address water hammer on your own, it’s essential to call a professional plumber. A licensed plumber can diagnose the issue and provide recommendations for how to address the problem. They may suggest installing an air chamber or water hammer arrestor or adjusting water pressure.

Conclusion

While tankless water heaters are less likely to cause water hammer than traditional water heaters, they can still produce this issue if not installed and maintained correctly. Preventing water hammer with a tankless water heater requires taking specific steps to regulate water pressure and minimize sudden valve closures. If you’re experiencing water hammer with your tankless water heater, there are several steps you can take to address the issue, including checking for loose pipes, insulating pipes, and calling a professional plumber.

By understanding the causes of water hammer and taking preventative measures, you can ensure your tankless water heater is working correctly and efficiently, and enjoy a quiet and comfortable home.

FAQs

Can water hammer cause pipe damage or leaks?

Yes, water hammer can cause pipe damage and leaks if left untreated.

How can I tell if I’m experiencing water hammer?

Water hammer produces a loud banging or knocking sound when you turn on or off a faucet or appliance.

Do I need to hire a professional plumber to install a water hammer arrestor?

While it’s possible to install a water hammer arrestor on your own, it’s recommended to hire a professional plumber to ensure it’s installed correctly and meets all safety and building codes.

Can I adjust the water pressure on my tankless water heater?

You can adjust the water pressure coming into your home by installing a pressure-reducing valve. However, it’s essential to consult a professional plumber to ensure it’s installed correctly.

How often should I have my tankless water heater inspected by a professional plumber?

It’s recommended to have your tankless water heater inspected by a professional plumber at least once a year to ensure it’s working correctly and efficiently.