Handling Boiler Humming, Hissing, and Gurgling Noises

2 Feb by Will Kruse

Handling Boiler Humming, Hissing, and Gurgling Noises

When it comes to dealing with boiler noises can be a challenging matter. Boilers are complex machines that can produce a range of noises, from the normal humming of the pump to strange hissing and clanking noises which can be distressing.

Understanding what the noises mean and how to handle heater repair is essential for a properly functioning boiler.

Common Boiler Noises

  1. Humming

    A low-pitched humming noise from your boiler is usually a sign that the pump is running. This is a normal noise and usually nothing to worry about. However, if the noise is louder than usual or persists, it could indicate a problem with the boiler pump. If this is the case, it’s best to call a qualified technician to investigate the issue and do heater repair if necessary.

  1. Hissing

    Hissing noises from a boiler can be caused by several issues. In some cases, it could be a sign of too much pressure in the system, while in other cases, it might indicate a leak in the system. If a drop in force accompanies the hissing noise, it could mean a blocked air vent. The best action is to call a qualified technician to investigate the issue and repair it if necessary.

  1. Gurgling

    Gurgling noises from a boiler usually indicate air in the system. This is generally caused by a blockage in the design and can be resolved by bleeding the radiators to remove the air. Bleeding the radiators can be done relatively quickly. Still, if you’re not confident or the noise persists, it’s best to contact a qualified technician to investigate the issue and repair it if necessary.

Steps to Handle Boiler Noise Problems

Fortunately, there are some primitive steps you can take to diagnose and address boiler noise issues. Here are some tips to help you identify and handle boiler noise problems:

  1. Check the Water Pressure

    Boilers use water to operate, so they must have enough water pressure to keep them running smoothly. Low water pressure can cause the boiler to make strange noises, so check the tank and gauge to ensure the pressure is at the correct level.

  1. Check the Pipes

    Pipes can become clogged or corroded, leading to strange noises from the boiler. Visually inspect the pipes for signs of corrosion or blockage. If you find any, you’ll need to get them cleaned or replaced.

  1. Check the Flue

    Boilers use flues to expel exhaust gases. If the vent is blocked or damaged, it can cause strange noises from the boiler. Inspect the chimney for signs of blockage or damage and have it fixed or replaced if necessary.

  1. Check the Burner

    The burner is the part that burns fuel to generate heat. If the burner is dirty or malfunctioning, it can cause strange noises. Clean the burner and check for any signs of damage. If necessary, have it repaired or replaced.

  1. Check the Valves

    Valves regulate the flow of water and steam in the boiler system. If the valves are not working correctly, they can cause strange noises from the boiler. Check the valves for any signs of damage or wear and tear. Call for heater repair if necessary.


Remember, it’s always better to be safe than sorry about your boiler. Take the time to inspect it regularly and address any issues as soon as possible. This will help ensure that your boiler is working safely and efficiently and will help you avoid costly heater repairs down the road.

L.J. Kruse Co. is an excellent choice for residential and commercial clients in Berkeley, California, who need plumbing, heating, and cooling services. With decades of experience, a team of highly-skilled professionals, and a commitment to providing excellent heater repair services in Berkeley, L.J. Kruse Co. strives to ensure its customers are delighted with their job. Contact us today to discuss your plumbing, heating, or cooling services needs.

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