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5 Common Causes of Boiler Noises, Explained

Women listening to noises coming from a boiler

Have you ever noticed strange noises coming from your boiler? While a noisy boiler may seem more distracting than concerning, unusual sounds could indicate a serious issue that needs professional attention.

Winter is no time to wait for a heating problem to arise. Michigan’s cold season starts as early as October, making it essential to have effective heating in place before temperatures dip below freezing. Regular maintenance can catch minor boiler issues before they escalate into significant malfunctions, like uneven heating or gas leaks.

When it comes to your boiler, listening is key. We’ll break down some common boiler noises, what they mean, and when to consider boiler replacement versus boiler repair.

Boiler Kettling

One distinctive noise you may hear is a rumbling or whistling sound reminiscent of a boiling kettle. “Kettling” is usually caused by a buildup of limescale, low water pressure, or a faulty thermostat. When there’s too much limescale or sludge in a boiler’s tank, water flow becomes restricted in the heat exchanger. Overheated water then bubbles and steams, producing popping and whistling sounds. Flushing a boiler’s tank of sediment usually resolves this issue.

Banging Noises

The “water hammer” effect may be to blame for loud, banging noises. This phenomenon happens when water inside a boiler switches direction, causing pipes to vibrate and create clanging sounds. Banging sounds may also be caused by:

  • Uninsulated pipework
  • An improperly sized water line
  • A pressure setting that is too high

If your boiler makes a single, loud bang when it’s turned on, you may be experiencing delayed ignition. This happens when the ignition sequence takes too long, allowing gas to accumulate before suddenly igniting.

Gurgling

Gurgling noises often signal trapped air in your boiler. While some air bubbles are normal, excessive air can lead to persistent gurgling or running water sounds. To remove trapped air, consider bleeding your radiators. If you’re unsure how to do this, an HVAC professional can help!

Humming

Low-level vibrating sounds can be normal, especially in high-efficiency boilers. But if you’re hearing loud humming noises, we recommend a boiler repair. Circulator pump malfunctions are a common cause of humming. The circulator pump transfers water from a boiler to radiators; if it feels hot to the touch or is leaking, you’ll want to call a technician.

Buzzing

Buzzing noises are typically caused by water pressure issues, loose components, or a malfunctioning gas valve. If buzzing is accompanied by a low hiss, a gas leak may be present. It’s crucial to take action at the first signs of buzzing since a gas or electrical issue can cause catastrophic damage to the unit.

Does My Noisy Boiler Need To Be Repaired or Replaced?

Generally, minor noises like gurgling or humming can be resolved with simple repairs. But it’s best to request a boiler inspection when any strange noises occur so that you get a professional diagnosis of underlying causes. In cases where the unit is 15 years or older or prone to frequent breakdowns, boiler replacement may be the most efficient and cost-effective solution.

Why Choose Indoor Comfort?

As full-service HVAC providers, we take pride in offering quality heating care that prioritizes homeowner comfort during Michigan’s coldest months. Our team of highly trained technicians are experts in boiler repair and installation, working diligently to deliver unrivaled heating solutions at an ideal price. We’re available 24/7 for emergency heating repair — don’t hesitate to give us a call if your boiler cuts out or begins making unexplained noises.

Our Name Is Your Guarantee. Speak to an Indoor Comfort team member today to schedule a boiler installation for your Ann Arbor, MI, home!

 

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