If you recently installed a tankless water heater and are bothered by the noise it makes, you’re not alone. Tankless water heaters provide hot water on demand without the need for a storage tank, but they do make more noise than conventional water heaters.
If you’re short on time, here’s a quick answer to your question: Tankless water heaters make noise due to the flow of water through the heat exchanger and combustion of gas for gas models. The noise can be reduced by installing noise dampening materials, choosing a unit with quieter operation, insulating pipes, and more.
In this comprehensive guide, we’ll cover the reasons tankless water heaters make noise, how loud they typically are, where the noise comes from, and most importantly, what you can do to reduce the noise.
What Causes Noise in Tankless Water Heaters?
Tankless water heaters are known for their energy efficiency and space-saving design. However, like any other appliance, they can produce noise that may be bothersome to homeowners. Understanding the causes of this noise can help you identify and resolve the issue.
Here are some common reasons why tankless water heaters make noise:
Flow Through the Heat Exchanger
One of the main causes of noise in tankless water heaters is the flow of water through the heat exchanger. As water passes through the unit, it can create turbulence and result in a gurgling or hissing sound.
This is especially true when the water pressure is high or when there are mineral deposits or sediments in the water.
Combustion Noise in Gas Models
In gas-powered tankless water heaters, combustion noise can be a factor. When the burner ignites, it creates a small explosion-like sound. This is a normal part of the heating process, but if the noise is excessive or consistent, it may indicate a problem with the burner or the gas supply.
Location and Reverberation
The location of the tankless water heater can also contribute to the noise level. If the unit is installed in a small, enclosed space, such as a closet, the sound may be amplified and seem louder than it actually is.
Additionally, the reverberation of the noise off nearby walls or surfaces can make it appear louder than it would in an open area.
Vibration and Rattling
Vibration and rattling noises are often caused by loose or improperly installed components. This can include loose pipes, fittings, or even the unit itself. Over time, the vibrations from the water flow can cause these components to become loose and create noise.
Ensuring that all connections are secure can help minimize these sounds.
It’s important to note that while some noise is expected from tankless water heaters, excessive or unusual sounds may indicate a problem that requires attention. If you’re experiencing loud or persistent noises, it’s recommended to consult a professional plumber or the manufacturer’s customer support for further assistance.
How Loud are Tankless Water Heaters?
Tankless water heaters are known for their energy efficiency and convenience, but one concern that homeowners often have is the noise level. So, just how loud are tankless water heaters?
Noise Comparisons
Compared to traditional tank water heaters, tankless water heaters are generally much quieter. This is because tank water heaters have a constantly running fan and a larger heating element, which can create a significant amount of noise.
In contrast, tankless water heaters only turn on when hot water is needed, resulting in less noise overall.
It’s important to note that while tankless water heaters are generally quieter than tank water heaters, they still produce some noise. The noise level can vary depending on several factors, including the brand, model, and installation location of the unit.
Causes of Noise
There are a few potential causes of noise in tankless water heaters:
- Flow Restriction: If there is a blockage or restriction in the plumbing system, the water flow through the tankless water heater may be noisy. This can be addressed by checking for any obstructions and ensuring that the water lines are properly sized.
- Mineral Buildup: Over time, mineral deposits can accumulate in the heat exchanger, causing it to make noise. Regular maintenance, such as descaling, can help prevent this issue.
- Ventilation Noise: Some tankless water heaters may produce noise due to the venting system. This can be minimized by ensuring that the venting is properly installed and free from any obstructions.
Solutions
If you find that your tankless water heater is making more noise than usual, there are several steps you can take to address the issue:
- Check for Blockages: Inspect the plumbing system for any blockages or restrictions that may be affecting water flow. Clearing these obstructions can help reduce noise.
- Regular Maintenance: Schedule regular maintenance for your tankless water heater, including descaling to remove any mineral buildup that may be causing noise.
- Proper Ventilation: Ensure that the venting system is installed correctly and is free from any obstructions that may be contributing to noise.
By addressing these potential causes and implementing the suggested solutions, you can minimize the noise produced by your tankless water heater and enjoy its benefits without the disturbance.
For more information on tankless water heater noise and solutions, you can visit websites such as energy.gov and consumerreports.org.
Where Does the Noise Come From?
When it comes to tankless water heaters, noise can be a common concern for homeowners. Understanding the source of the noise can help you identify the problem and find the right solution. There are several components in a tankless water heater that can contribute to the noise, including the heat exchanger, burner assembly, blower fan, and the pipes and plumbing.
The Heat Exchanger
The heat exchanger is one of the primary sources of noise in a tankless water heater. As water flows through the heat exchanger, it can create a rumbling or gurgling sound. This is often caused by a buildup of sediment or mineral deposits on the heat exchanger.
Regular maintenance, such as flushing the system, can help reduce the noise caused by the heat exchanger.
The Burner Assembly
The burner assembly is responsible for igniting the gas and heating the water in a tankless water heater. When the burner ignites, it can produce a clicking or popping sound. This is a normal sound and is not usually cause for concern.
However, if the sound is excessively loud or continues for an extended period of time, it may indicate a problem with the burner assembly that should be addressed by a professional.
The Blower Fan
Some tankless water heaters are equipped with a blower fan that helps to exhaust the combustion gases and maintain proper airflow. The blower fan can produce a humming or whirring noise when in operation.
If the noise from the blower fan becomes loud or irregular, it may indicate a problem with the fan motor or the fan blades. In such cases, it is recommended to contact a technician for further inspection and repair.
Pipes and Plumbing
In addition to the internal components of the tankless water heater, the noise can also originate from the pipes and plumbing system. Water flowing through the pipes can create a variety of sounds, including knocking, banging, or vibrating.
This can be caused by high water pressure, loose pipes, or inadequate insulation. Ensuring proper installation and maintenance of the plumbing system can help minimize these noises.
Solutions for Reducing Tankless Water Heater Noise
Install Sound Dampening Materials
One effective solution for reducing tankless water heater noise is to install sound dampening materials. These materials are designed to absorb and minimize sound vibrations, helping to reduce the noise produced by the water heater.
Common sound dampening materials include acoustic foam panels, mass loaded vinyl, and soundproof curtains. By placing these materials around the water heater, you can significantly reduce the noise levels in your home.
Choose a Quieter Model
When selecting a tankless water heater, it’s important to consider noise levels as a factor. Some models are designed to be quieter than others, so make sure to do your research and choose a model known for its noise reduction features.
Look for water heaters that have a noise level rating or check customer reviews to get an idea of how quiet a particular model is. Investing in a quieter model can make a significant difference in reducing the noise produced by your water heater.
Insulate Pipes
Another solution for reducing tankless water heater noise is to insulate the pipes. The vibrations caused by the water flowing through the pipes can contribute to the overall noise levels in your home.
By insulating the pipes with foam sleeves or pipe wraps, you can help dampen these vibrations and minimize the noise. Additionally, insulating the pipes can also help improve energy efficiency by reducing heat loss during the water heating process.
Isolate Vibrations
Tankless water heaters can produce vibrations that contribute to the noise they generate. To reduce these vibrations, you can use vibration isolation pads or mounts. These pads or mounts are placed underneath the water heater and act as a buffer to absorb and dampen the vibrations.
By isolating the vibrations, you can significantly reduce the noise levels produced by the water heater.
Relocate Away from Living Spaces
If all else fails, consider relocating your tankless water heater away from living spaces. Placing the water heater in a basement, utility room, or garage can help minimize the impact of the noise on your daily activities.
However, moving the water heater may require additional plumbing and installation work, so it’s advisable to consult a professional to ensure a proper relocation.
Remember, it’s essential to address any excessive noise from your tankless water heater, as it can cause disturbances and affect your overall comfort at home. By implementing these solutions, you can enjoy the benefits of a tankless water heater without the unnecessary noise.
When to Call a Professional
While tankless water heaters are generally low-maintenance and reliable, there are certain situations where it is best to call a professional. Here are some instances where professional assistance is recommended:
1. Loud or Unusual Noises
If your tankless water heater is making loud banging, hissing, or rattling noises, it is a sign that something is not right. These noises can be indicative of a faulty component or a buildup of sediment in the system.
It is best to call a professional plumber who specializes in tankless water heaters to diagnose and fix the issue.
2. Constant Malfunctions
If your tankless water heater is constantly malfunctioning, such as frequently shutting off or failing to provide hot water consistently, it is a clear sign that there is an underlying problem. A professional plumber will be able to identify the cause of these malfunctions and provide the necessary repairs or replacements.
3. Gas Leaks
If you detect the smell of gas near your tankless water heater, it is crucial to act immediately. Gas leaks are extremely dangerous and can lead to fire hazards or even explosions. In such cases, it is important to evacuate the area and call a professional plumber or the gas company for emergency assistance.
4. Water Leaks
Water leaks can occur due to a variety of reasons, such as a faulty pressure relief valve or a damaged pipe connection. If you notice water pooling around your tankless water heater or any signs of water damage, it is advisable to call a professional plumber to assess and fix the issue.
Ignoring water leaks can lead to further damage and costly repairs.
Remember, attempting to fix these issues on your own without the necessary expertise can potentially worsen the problem and may even void your warranty. It is always better to rely on professionals who have the knowledge and experience to handle tankless water heater repairs effectively and safely.
Conclusion
In conclusion, noise from tankless water heaters can be annoying but there are solutions. Understanding what causes the noise and taking steps like soundproofing, buying a quieter unit, and proper installation will help reduce noise.
With some simple fixes, you can enjoy the efficiency and convenience of tankless hot water without the bothersome noise. Contact a plumber if the noise persists after trying these remedies.
