Causes of Rattling, Banging, and Tapping Boiler Noises

2 Feb by Will Kruse

Causes of Rattling, Banging, and Tapping Boiler Noises

The sound of rattling, banging, and tapping noises coming from your boiler can be disconcerting, to say the least. Fortunately, these noises are usually nothing to worry about and can be easily fixed.

To understand why these noises are happening, we’ll need to take a closer look at each issue.

Rattling Noises from Your Boiler

Rattling noises from your boiler may be caused by a build-up of scale in the heat exchanger. This is a common problem, and it can be due to hard water or an accumulation of dirt and debris. The scale restricts the flow of water and can cause the heat exchanger to vibrate, resulting in a rattling sound.

Banging Noises from Your Boiler

Banging noises from your boiler may be caused by a phenomenon known as “kettling.” This occurs when a build-up of sediment, scale, and other deposits in the heat exchanger causes it to overheat. As the metal expands, it can collide with the walls of the boiler, resulting in a banging noise.

Tapping Noises from Your Boiler

Tapping noises can be caused by a number of issues, such as a worn pump or a loose part. If this noise is accompanied by a smell of gas, it is likely indicative of a gas leak, and it is important to contact a professional to address this issue. On the other hand, if the tapping noise occurs without any smell of gas, it may be due to a worn pump or a loose part. In this case, it’s best to call a professional to check the boiler and make any necessary repairs.

How to Fix These Issues

If you hear rattling, banging, and tapping noises coming from your boiler, it’s time to take action. These noises indicate that something is not right and could lead to more serious problems if left unchecked. Fortunately, there are a few basic steps you can take to fix these noises and get your boiler back to normal.

First, check the vents on the boiler. These vents are responsible for releasing the air and steam that builds up inside the boiler. If they’re blocked, the steam will have nowhere to go and will escape through the boiler itself, causing loud noises. Check the vents to make sure they’re not blocked and clear any obstructions as needed.

Next, inspect your boiler’s piping. If the pipes are loose or poorly connected, they may be rattling and tapping. Tighten or replace any loose or faulty parts as needed. If you’re not comfortable doing this yourself, contact a professional plumber for assistance.

In addition, it’s important to check for any mineral deposits or scale buildup inside the boiler. This can cause a variety of issues, including banging, rattling, and tapping noises. Clean out the boiler as needed to remove any deposits. Alternatively, you can add a chemical descaler to the system to dissolve any hard buildup.

Finally, check your boiler’s pressure. If the pressure is too low, the boiler will struggle to heat up and may make loud noises. Adjust the pressure as needed to get it back to the recommended level.

By observing these steps, you should be able to perform appropriate heater repair with any rattling, banging, and tapping noises coming from your boiler. However, if you’re still hearing noises after doing these steps, it’s best to contact a professional for assistance. They’ll be able to diagnose the issue and make any necessary repairs to get your boiler running smoothly again.


If you hear rattling, banging, or tapping noises coming from your boiler, it is important to address the issue as soon as possible. These noises can indicate a variety of problems, so it is important to contact a certified technician who can inspect the system and make the necessary repairs. With the right care, you can ensure that your boiler is running smoothly and safely.

L.J. Kruse Co. is an excellent choice for plumbing, heating, and cooling services in Berkeley, California. Our experienced technicians are highly trained and provide professional, reliable, and top-notch service. We are also available 24 hours a day for emergency services. If you’re looking for high-quality boiler or heater repair services in Berkeley, don’t hesitate to contact us. We look forward to hearing from you!

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