Why Is My Tankless Water Heater Making Noise?

How To Reduce Noise From A Tankless Water Heater

It doesn’t matter what you’ve heard about tankless water heaters, they may be rather noisy.However, even if those noises do not necessarily indicate a problem with the heater, you should investigate the source of the noise and fix any underlying problems.To lessen the amount of noise produced by a tankless water heater, it is common practice to cleanse the system with vinegar, tighten any loose parts, or ensure that the intake and exit valves are completely opened.To your advantage, you may complete these maintenance tasks on your own, saving you the cost of hiring a professional plumber.After detailing the three procedures necessary to lessen the noise produced by a tankless water heater, this article will go on to address remedies to other frequent problems related with these appliances.Read my tutorial on how to reduce the noise produced by standard water heaters.

Identify the Source of the Noise

  • The very first thing you’ll want to do is figure out where the noise is coming from. Once you’ve determined the source of the noise, you may go on to determining the best course of action to take to decrease or eliminate the problem. If your tankless water heater is making noise, it is usually due to one of five factors, or a combination of them. Loose components, limited water flow, silt accumulation, changes in water pressure, and vibrations are just a few of the reasons for this. The following are the signs and symptoms of each problem: Parts that aren’t attached: Humming or rattling noises coming from your tankless water heater are typically indicative of a problem with one or more of the system’s components.
  • Water flow has been restricted: Screeching sounds indicate that the water flow in your unit has been restricted.
  • Sediment accumulation: When you have sediment buildup in your systems, you may generally hear cracking or hissing sounds. Additionally, in severe circumstances, popping sounds can be heard when the sediment begins to break apart as a result of the heat.
  • Water pressure changes generate a ticking sound, which is the most prevalent type of noise caused by fluctuating water pressure.
  • Vibrations: The most typical type of noise created by fluctuating water pressure is a ticking sound.

Each of these issues has a distinct remedy, which we shall cover in further detail below.

Apply the Proper Corrective Action

  • Whichever remedial action you choose will be determined by the source of the noise. Examples include: Noises created by unsecured components: Tighten any loose parts that you identified in step one with a wrench or socket that is appropriate for the job. Due to the possibility of lasting damage to your system depending on the specific parts that have been damaged, it is critical that you precisely identify any loose pieces.
  • Noises produced as a result of limited water flow include: Double-check to see that the water intake and exit valves are both completely opened before proceeding. If this is not the case, spin the taps counterclockwise until they are completely engaged. You may need to have a plumber evaluate your water pipes, as well as the temperature and pressure relief valve, if the sound continues to be heard.
  • Noises induced by silt accumulation include: Sediment does not dissipate on its own own. You will need to flush the system with vinegar to get rid of any sediment that has accumulated. In severe circumstances, the sediment accumulation inside electric tankless water heating systems might completely engulf the heating element and cause it to fail. The heating element must be removed from the machine and thoroughly cleaned using a wire brush and vinegar in this case.
  • Noises caused by oscillations in water pressure: Try to locate the source of the noise and tighten any slack straps that are keeping your pipes in place. Spacers between the pipes and the walls can be used to quiet any noises that may be generated
  • Vibration-induced noises include: If the system is attached directly to the wall, you may place a rubber or foam mat between the system and the wall to protect it from damage. You can use audio insulation developed for autos to insulate the interior of the case if the device is contained within a closed container.

Take Preventative Measures to Prevent Future Noises

  • Noises caused by loose parts: Check your tankless water heating system on a regular basis for any parts that have become loose over time.
  • Noises produced as a result of limited water flow include: Make certain that the input and exit valves are completely open at all times.
  • Noises produced by sediment buildup: You should clean your water heating system once a year to avoid these problems from occurring. If, on the other hand, your local water supply is very hard, you may find that you need to cleanse your system more regularly. An additional and rather pricey alternative is to install a water softening system between your water source and your water heater. You may still need to flush your system on a regular basis, but doing so using this tool makes the job a whole lot simpler.
  • Noises induced by changes in water pressure include: Check for any loose straps on the pipes that are linked to your tankless water heating system on a regular basis. Additionally, you might want to try adding spacers between the pipes now, before the noise becomes a problem in the future.
  • Sounds produced by vibrations: Instead of waiting until the sound becomes an issue, you should consider putting a mat or acoustic insulation while installing your water heating system.

Solutions to Other Tankless Water Heater Problems

Occasionally, you may have problems with your tankless water heater that are unrelated to noise and that will need to be handled as soon as they develop. Exhaust obstruction, ignition failure, overheating, and system overload are all issues that you may have with your tankless water heating system at some point.

Exhaust Blockage

If the control panel of our unit displays an error code suggesting an obstruction, this indicates that your unit is experiencing a difficulty with its venting.Fortunately, resolving this issue is a rather straightforward process.Before you begin, you should double-check all of the vent pipes to ensure that they are properly connected.Additionally, make sure that no obstructions such as bird nests, tree branches, or other objects are obstructing the external vents that are not covered by other objects.If this is the case, remove any blockages from the vent pipes while making certain that nothing falls down the vent pipes.

Ignition Failure

If your system fails to ignite, check to see that your gas and water valves are both fully open before proceeding.If this is the case, spin the tap handles completely counterclockwise.If your device runs on propane, check to see that your tank is not completely depleted.Similarly, if your system is powered by natural gas, check to see that your home’s gas has not been shut off by your service provider.Similarly, if the system is powered by electricity, check to see that the device has not been mistakenly disconnected.To determine whether this is the case, look to see if the power cable has been detached from the heating unit.

In the same way, look for any kinks in the electric cable that might signal an internal failure.If those methods fail to resolve the problem, you may have a problem with the ignition pack of the device.A licensed plumber would most likely be required to rectify the situation in such case, as described above.In the same way, if you feel there is a problem with your unit’s gas supply, it is important to consult with a competent specialist right once.Using gas is quite risky, especially if you don’t have the right equipment to test the system after you’ve finished making any repairs.


Water heaters that do not have a tank are more prone to overheating, especially if many hot water sources are utilized at the same time.Examine your system’s temperature settings if it overheats and shuts down unexpectedly.Tankless water heaters perform best when the temperature is 120°F (48.9°C).If the system continues to overheat, you should contact a certified plumber who will inspect the system for mechanical malfunctions.

System Overload

If you use too many hot water applications at the same time, you may encounter a system overload, which is dependent on the capacity of your unit.Washing dishes when someone else is having a shower, for example, might place an excessive amount of strain on your water heater.If this occurs, you should either minimize the number of programs running at the same time or upgrade to a more powerful machine.Similarly, you may want to consider placing numerous units around your home in order to reduce the burden on any single unit.

The Wrap Up

Tankless water heating systems are a great investment for your home’s water heating needs.They are energy efficient, take up little space, and deliver an almost limitless supply of hot water on demand.It is recommended that you save this page for future reference if you have a tankless water heating system or are contemplating installing one in the future.Also see: Is Your Boiler Making a Loud Noise?Here’s what you should do.

13 Common Reasons Why Your Water Heater Making Noise

″Why is my water heater producing noise?″ is a frequently asked topic by homeowners.These sounds can be described as a hum, a pop, or a rumble.If you listen closely, you could hear a crack or perhaps a small sizzle.Showering while using a loud heater, on the other hand, might turn into a nightmare.So, what is the root source of this problem?Some of the noises, on the other hand, might indicate a problem.

As a result, you will need to determine the source of the problem in order to prevent more problems with the device.This is a difficult undertaking that may be irritating.You may use this method to figure out what is causing your water heater to be noisy.As a result, before you spend hours searching the internet for ″Reasons Why Your Water Heater Is Making Noise,″ consider the following likely explanations and the noises you will hear.

Top Reasons for a Noisy Water Heater

  • Here are seven possible explanations for the noise coming from your water heater. A tank that contains sediment and mineral deposits
  • poor water flow
  • frequent changes in water pressure
  • and other issues.
  • Tanks that are leaking and condensed
  • The source of the water supply
  • the state of the heating element
  • and other factors.

Tank Containing Sediment & Mineral Deposits

1. Sediment Buildup

If the storage tank on your water heater is clogged with debris, it will only store water at the place where the burner is located on the water heater.Here, when the machine heats water, it makes the same noise as a coffee maker while it is operating.This noise is caused by the water bubbles that form when it flows through the sediment layer.Consider the scenario of preparing water in a covered pot to have a better understanding of the situation.As soon as the water is heated, it begins to bubble and the lid begins to move.There will be no explosion in your home as a result of the heater.

The debris, on the other hand, might cause the tank to overheat.After a period of time, this results in a less powerful water heater tank.Finally, there will be leaks in the tank that may cause troubles in your home.It has the potential to cause the container to rupture.Any of these problems might result in thousands of dollars in building damages if they are not addressed immediately.So, what can you do to keep dirt from accumulating in your tank?

You’ll want to purge your water heater as often as possible to keep it running efficiently.If you put off this activity for a lengthy period of time, the quantity of residue that builds up may make it difficult to flush the system.

2. Accumulation of Mineral Deposits

If you live in an area with hard water, the mineral deposits in your heater tank will begin to build up in your tank. Various minerals, such as magnesium and calcium carbonate, get trapped in this area when water flows towards your home. Fortunately, none of these elements may be harmful to your health.

3. Popping

When you have been using your tank for several years, you may notice an accumulation of residue that causes popping sounds.This implies that you will need to thoroughly clean out your tank in order to eliminate the limescale buildup that has formed.Residue may take on a variety of shapes and sizes, and this solid particle settles to the bottom of the tank.It can be made up of sand, small stones, and other small particles.It is also possible that minerals are responsible for the formation of limescale on the internal walls of the heater.

4. Rumbling

Water expands as it heats up and flows through the debris as it is heated by the water heater.When this occurs, you will hear a rumbling sound, which is especially noticeable when the water is moving through the ground.Rumbling in the tank indicates that there is a significant quantity of filth in the heater, which should be cleaned out immediately.If it is not hazardous, it indicates that your heater will not work as expected in the future.Make certain that the dirt in the tank is removed to avoid this problem.If you leave the residue on your heater, it might cause damage, which can result in additional charges for repairs or replacement.

5. Crackling, Sizzling, Hissing, or Popping

Do you hear any cracks, sizzles, hisses, or pops when you switch on your electric water heater, particularly when it is first turned on?The debris has then engulfed the components of the tank that are responsible for boiling water.Make careful to empty the tank and clean off the debris that has accumulated on the heating element at this time.To do this, remove the object from the heater and soak it in a dish filled with vinegar before cleaning it.Make sure to clean up after yourself using a wire brush.Alternatively, if the silt obstructs the drain valve, it may be hard to empty the water from the storage tank completely.

As a result, you will need to purchase a new water heater.In the event that you do not have any urgent plans to replace the unit, you can continue to use the heater until it begins to leak.It is best to utilize a leak detector made specifically for water heaters in order to detect a leaking tank.When it detects a leak, it sounds an alarm to alert the user.These gadgets are simple to use and reasonably priced, and they can identify leaks in as little as a few minutes.

Poor Water Flow

6. Sizzling

If you hear a sizzling sound coming from your heater, this indicates that water is not flowing freely into its tank.You may identify the source of the problem to a few of valves in the unit.Go to the temperature and pressure relief valves and turn them on.This mechanism allows water to be released from the storage tank, which is particularly useful when there is excessive pressure.If you hear a sizzling sound coming from this device, immediately turn off the electricity and water.After that, get a local plumber to come out and do some repairs.

You may also have a look at the valve that regulates the flow of water into the storage tank.Check to see that all valves have been opened.In addition, I urge that you check other lines for bending as well.In addition, you should search for any closed valves that need to be opened.

Frequent Changes in Water Pressure

Different pressure levels in your plumbing system might also cause your heater to be loud.

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7. The Pipes in Your Building

Aside from water heaters, the pipes in your building may make obnoxious noises as they circulate water.Water passing through pipes changes the diameter of the tube as it moves from one temperature to another.Tickling is produced as the pipes grow in size and collide with the wooden frames and delicate straps of the sconces.Follow the sound until it reaches its loudest peak.When you’ve located it, tighten the pipe around it.It is also possible to employ spacers to secure it in place.

Additionally, you may reduce the pressure on the water heater, which will reduce the noise.In order to complete this assignment, lower the temperature of the device.

8. Ticking

Having frequent pressure variations in your pipework will result in the production of a ticking sound. A water heater is typically equipped with nipples that link it to the pipes. These nipples are equipped with characteristics that help you store heat and make your heater run more efficiently. It is necessary to replace this piece if the ticking is caused by the heat trap in the model.

Leaks & Condensation

9. Leaky Water Heater

As we discussed before in our article ″Reasons Why Your Water Heater Is Making Noise,″ it is important to note that leaks in water heaters can also generate noises.If your device is experiencing this issue, it will emit a sizzling sound, which is most noticeable when you switch off the burner.In order to resolve this issue, you need contact a professional plumber in your area.Identify the location where a pool of water has formed if you cannot locate the leaky heater.

10. Sizzling

If you have a gas water heater that makes sizzling noises, what should you do? In such case, condensation is a plausible explanation. When water droplets develop in the tank, they have the potential to fall onto the unit’s burner. If the heater becomes too hot, it will sizzle as soon as the water comes into contact with it.

Faulty Heating Element

11. Humming

Some water heaters create buzzing noises when they are operating.They also feature a heating element on the top and bottom of the heater, which is a nice touch.When cold water is introduced into the tank and circulated throughout the unit, the top portion of the unit will shake and produce the sound.The hum can be irritating to everyone, but it will not cause damage to the heater or its components.Increase the tightness of the heating element to resolve this issue.

Source of the Water Supply

Each of the following noises is related to the current condition of the water. They are as follows:

12. Popping

Because aluminum anode rods are used in the construction of your heater, it will react with water that has a high pH level.When chlorinated water is used in the house, a response like this happens.A gel is formed at the bottom of the tank and along the rod when the chemicals mix.It will be necessary to clean up the residue and replace the present anode with a magnesium-based type in the future.

Other Noises

13. Tankless Water Heater Noise

Additionally, other kinds, in addition to standard heaters, might generate irritating noises.For example, the sound produced by an electric tankless water heater is distinct.Even a tankless gas water heater is susceptible to the same problem.If you hear a clicking sound, this indicates that the flow switch is being turned on and off (completely normal).If you notice more noise, look for debris caused by hard water in the pipes.Water softening can be accomplished with the use of a special appliance.

Other factors that contribute to noise in tankless water heaters include a dirty fan, leaks, and a malfunctioning burner.However, when used as a storage unit, they make very little noise.

How Can You Solve This Problem?

Solving this problem will need further work and expertise. You will thus want the services of a professional plumber in order to find a satisfactory solution. If you put off the repair, you will wind up with higher energy and water expenses in the future.

Wrap Up

Many households have the problem of a ″electric water heater generating noise.″ Other types of heaters, in addition to this particular model, are affected by this problem.The source of a bubbling noise coming from a water heater can be traced to garbage.If your water heater is making noises that sound like water is running, you will need to check for leaks.A water heater that is humming and producing noise will require you to inspect its heating element if the problem is with the water heater humming and making noise.Several factors can contribute to the production of noise in a tankless water heater.Parts that are filthy and systems that are inefficient are examples of this.

To get rid of the noises, clean out your unit or replace any worn out parts or the tank.It is possible that you may need to contact your plumber.If you have any questions or comments, please feel free to post them in the comment box provided below.

Is Your Water Heater Making Noise? (HERE’S WHAT TO DO)

Please keep in mind that this content may contain affiliate links. This means that, at no additional cost to you, we may gain a small profit on purchases made via our links. Though every rule has an exception, the following are the most typical noises you may hear from your water heater, as well as the most prevalent water heater problems that are related with them:

Crackling, Popping and Rumbling

A water heater’s element tubes become clogged with sediment as time goes on.During periods when the element is turned off, the caked sediments trap water beneath them, and the water warms until it crackles or pops as it is driven through the deposits.Specifically, this is more prevalent on older units, and the noise level increases as the deposit layer becomes thicker.Remove the element and clean it or replace it.Another sign that the heater requires repair is the production of a rumbling sound, which is caused by sediments being stirred up by the water movement within the tank.Cleaning the tank and draining the water heater should be done using a deliming solution.

If maintenance does not resolve the issue, the source of the noises may be anything as simple as the expansion and contraction of the main steel tank or expansion tank during normal operation.If maintenance does not resolve the issue, the source of the noises could be something more complex.When the water is heated over 125 degrees, metal pipes can generate comparable noises to those made by plastic pipes.


When it comes to electric water heaters, the element is often installed vertically in respect to the tank. In this circumstance, water flowing around the element might generate vibrations, resulting in a humming sound to be heard. To remedy the problem, tighten the part just a little bit more.

Knocking or Hammering

A pounding sound in your walls is caused by the internal heating of pipes, and it is referred to as ″water hammering″ in the industry.Water entering or exiting the tank can be caused to move if the water is shut off quickly, causing the pipes to knock against studs or the interior of walls.This can be caused by a dishwasher or toilet bowl overflowing, as well as by a water pump that does not have a collection tank.The noise does not pose a threat to your water heater, but it might cause damage to your walls if it is not addressed immediately.Interconnect the problematic item with the water heater and install a water hammer arrestor between the two.

Singing, Screaming or Screeching

Water is driven through a tiny aperture, resulting in the production of screaming noises. Typically, this is caused by a valve that is not completely opened, either at the water heater or at a specific outlet such as a sink. Check the valves on your water pipes to make sure they are working properly.

Ticking or Tapping

Many water heaters are equipped with heat traps or check valves, which are inserted in the pipes that run above the heater.Designed to prevent water from flowing in the incorrect way through the pipes, these traps may emit ticking or light tapping noises when water flows through them.The heat trap is typical in this situation, but if it bothers you, you may replace it with an ordinary dielectric nipple.You should also be aware that when the hot water in your pipes cools down, your plumbing may create similar noises to those heard above.

Other Noises?

Tankless Water Heater Noise

Tankless water heaters have their own individual noises that are difficult to distinguish.In most cases, if you hear a clicking noise, it is the flow switch going on and off to start and stop the flow of water.This is totally normal and should not be concerned about.A lot of noise when the water is switched on might be caused by calcium deposits that have been left behind owing to hard water in your location, according to the manufacturer.It is possible that a water softening system will be required.Other possible causes of a noisy tankless water heater type include a problem with the burner, a filthy fan, or a leak in the sealed combustion system, which results in erratic gas combustion.

When comparing a tankless water heater to a traditional tank water heater, there is a lesser likelihood of hearing unusual noises.

Water Heater Maintenance

Regular cleaning and maintenance of your water heater will eliminate the majority of the noises that are associated with it.A water softener in your primary water line will lessen accumulation and the related sounds in your water heater, which is due to the minerals in your water causing sediments in your water heater.Flushing the tank with a deliming solution once a year will avoid significant buildup in the tank and will also keep the tank and surrounding parts cleaned.Anyone can learn to be a responsible water heater owner with a little bit of simple maintenance on their part.

Tankless Water Heater Making Noises? Here Are Some Possible Causes

Get in Touch with Our Fort Wayne Service Technicians The majority of tankless water heaters will produce some noise when they are first turned on and when they are heating water, but the noise levels are typically manageable and not a source of concern.The presence of a vacuum, even when no hot water is being utilized, indicates the presence of a vacuum that is sucking water out from the unit, resulting in the creation of loud noises and vibration.A check valve installed in the water line will usually solve the problem since it will prevent other plumbing fixtures from interfering with the flow of water to the water heater in most circumstances.Another typical problem that can cause noise in tankless water heaters is a clogged flow sensor, which regulates the amount of gas that is delivered to the heater unit.Other sources of noise include obstructed or insufficient ventilation, as well as a pressure valve that is broken or incorrectly adjusted.

What Does a Bad Water Heater Sound Like?

  • Noises of humming – If you are hearing humming noises, it is most likely because your water heater element is loose, causing the water running around it to generate vibrations. There is no need to be concerned about these noises. If the buzzing is bothering you, a plumber can tighten the element for you. Additionally, if the house owner is handy, they may be able to tighten the part themselves.
  • Water pounding is a term used by plumbers to describe this process. When the pipes are installed, they make contact with the wall, resulting in the noise. Due to the possibility that the pipes are not firmly fastened, the water pressure might slam them into the wall studs or against the inside of the wall. If you flush a toilet or operate a water pump without a holding tank to moderate the flow of water, you can do this by turning the water on and off quickly. Despite the fact that it is not a critical issue, if you do not address it immediately, you may suffer consequences later on. Because the problem has nothing to do with your water heater, it is not required to replace your water heater in order to resolve it. The banging and knocking are not coming from that direction. A water hammer arrestor may be installed by a plumber to fix the problem. Hissing – Hissing noises are frequently suggestive of a leak. Typically, the source of water or steam will be a water heater or a pipe leading to one. When it comes to leaks of this nature, the vast majority of the time, expert plumbing assistance is required. Water heaters that are more than a decade old may require replacement.
  • Screeching – A small aperture is being forced through under tremendous pressure, resulting in the high-pitched noises heard. This is frequently caused by a valve that has been opened only partially. This valve may be located near your water heater, or it may be closer to faucets or an appliance in your house. Determine the source of the noise by paying close attention to it. Perhaps a replacement of the valve on the water heater itself is required. It’s important to make sure you’re familiar with the process or get a professional plumber to handle it because the risk of steam burns is considerable.
  • Typically, heat traps or check valves that have been added to encourage water flow in the appropriate direction may make a tapping or ticking sound while they operate. These sorts of sounds can also be caused by the heating and cooling of water in the pipes. Some homeowners are finicky and will not tolerate the ticking or tapping noise
  • in this instance, a dielectric nipple can be used in place of the heat trap to provide a quieter alternative. Although this is a good first step, it does not ensure that the noises will cease. Important to remember is that this is not a sign of a serious problem, so if you only hear it sometimes while you are in the room where your water heater is located, you would be well served to disregard it.

Because there are several potential sources of the noise, it is preferable to have a plumber analyze the problem and, if necessary, repair the unit. Have a question about your water heater? We can help. Gibson’s Heating & Plumbing, Inc. will assist you with any and all of your hot water requirements. Call us right away! Categories:

Why is my tankless water heater making a loud noise?

Asked in the following category: General The most recent update was made on the 19th of January, 2020.The presence of a vacuum, even when no hot water is being utilized, indicates the presence of a vacuum that is sucking water out from the unit, resulting in the creation of loud noises and vibration.Another typical problem that can cause noise in tankless water heaters is a clogged flow sensor, which regulates the amount of gas that is delivered to the heater unit.When gas tankless hot water heaters are turned on and heating water, they produce a lot of noise, however the decibel levels are normally less than 90 dB.There’s a strong likelihood that another source is sucking water from the pipe and generating a vacuum if the noise happens while hot water isn’t being utilized.What is the source of the high-pitched noise coming from my water heater?

It is possible that a high pitched noise emanating from your water heater is caused by high incoming water pressure.Water heaters are built with a temperature and pressure relief safety valve as standard equipment.Whenever the temperature within the tank rises beyond a certain threshold or when there is an excessive buildup of pressure inside the tank, this valve is meant to open and discharge water.As a result, what can I do to prevent my water heater from creating noise?Regardless of whether your tank is driven by gasoline or electricity, you can frequently eliminate the noises on your own by carefully following a few simple methods outlined below.

  1. If your hot water tank is making a rumbling or banging sound, you may fix it by cleaning away the dirt that has accumulated at its bottom.
  2. Turn off the cold water supply to the tank by turning the shut-off valve on the shut-off valve.
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What are the disadvantages of using a tankless water heater?Tankless water heaters provide an infinite supply of hot water while taking up less space, posing a reduced danger of leaking, being safer, and having an overall lifespan that is substantially longer than conventional water heaters.The most important drawback of tankless water heaters is that their upfront cost (both for the device and for installation) is substantially greater than that of tank-style water heaters (see chart below).

Problem with Noise from Tankless Hot Water Heater

Hello, Nora.When gas tankless hot water heaters are turned on and heating water, they produce a lot of noise, however the decibel levels are normally less than 90 dB.A decibel meter may be used to determine how loud your tankless water heater is actually operating at any given time.For those who have a smartphone, you may download a free decibel meter app called SoundLevel and take your own measurements of the decibel level output.There’s a strong likelihood that another source is sucking water from the pipe and generating a vacuum if the noise happens while hot water isn’t being utilized.A strange groaning sound coming from the pipes or the tankless water heater when you flush the toilet might indicate that this is the source of your problem.

Despite the fact that a toilet only utilizes cold water, I have observed certain toilets that behave in this manner.This necessitates the installation of an additional check valve in the water line by a plumber in such situation.Wishing you success with your endeavor,

Further Information

  • Tankless Water Heaters (video)
  • How to Choose a Hot Water Heater (article)
  • Tankless Water Heaters (photo gallery).
  • The Benefits of Energy-Efficient Tankless Water Heaters in Your Home (video)
  • Is Water from a Tankless Hot Water Heater Hot Enough? (article)
  • Is Water from a Tankless Hot Water Heater Hot Enough?

Sometimes My Water Heater Makes Noises

It is the job of your water heater to supply hot water for showers, dishwashing, laundry, and any other uses that you may have in your home.When you hear weird noises emanating from your water heater, it’s understandable that you would find it disconcerting.If this occurs, it might be a warning indication that something is amiss with the patient.The most typical noises that individuals hear coming from their water heaters are a rumbling sound and a loud crash, respectively.This is what you need to know if something like this is happening in your unit so that you can deal with the situation correctly.When we talk to homeowners, one of the most often asked questions is ″why is my water heater producing noise?″ These noises can be described as rumbling, loud banging, sizzling, or humming.

Regardless of what it is, it is almost certainly unpleasant and may suggest that there is an issue with your unit.We’ve reduced it down to the most prevalent causes, which are as follows:

Sediment and Mineral Deposits in the Tank

A rumbling sound coming from your water heater is an indicator that material or silt has accumulated at the bottom of the tank and needs to be cleaned up.Occasionally, boiling water might become stuck in the sediment, causing it to make noise and reducing the overall efficiency of the tank.Draining the tank may be necessary in some instances to resolve this problem.It is possible that the debris in your water heater tank will cover the components that are needed to heat the water, such as the heating element, if you have an electric water heater.Remove these components from the system and clean or replace them as necessary to correct the condition.

Issues with the Heating Element

An electric heating element is often found at the top and bottom of most water heaters. Cold water enters the tank and flows around, ″shakes″ the heating element, causing it to ″humming″ and making a humming noise. Often, simply tightening the heating element may resolve the problem completely.

Leaky Tanks

It is possible that a leaking tank will produce some noise, although this is not always the case. It is recommended that you test your water heater on a regular basis to search for any leaks. When you switch off the burner, you will most likely hear a ″sizzling″ sound, which indicates that there is a problem.

Poor Water Flow

If you’re experiencing a sizzling noise coming from your water heater, the problem might be related to insufficient water flow into the tank.Going to the pressure relief and temperature valves is one method to figure out what’s going on here.This gadget discharges water from your tank when there is an excessive amount of pressure.If you hear ″sizzling″ coming from this region, turn off your water supply and electrical service.Then, ask your local plumber to come out and look at the problem and make any necessary repairs.


When your water heater begins to ″speak back″ to you, you may want professional assistance in identifying and resolving the problem so that you may live and enjoy your hot water without interruption.We’d be pleased to assist you in determining what’s producing those irritating sounds and to discuss your choices for repair, replacement, and upgrading of your system.Just give us a call.And we’ll get it done quickly!Uncategorized On January 4, 2022, there will be no comments.Uncategorized January 4, 2022 There are no comments.

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Buzz, Hiss, Screech – Why Is My Water Heater Making Noise?

Skip to the main content What is the source of my water heater’s buzzing, hissing, and screeching?Noises Produced by a Hot Water Heater The presence of sediments in a water heater is producing noise.You might be wondering what the source of the noise coming from your water heater is.Should you undertake routine maintenance, contact a plumber, or simply ignore the sounds that are bothering you?Are you concerned that it may be nearing the end of its useful life?We all know that replacing a water heater can be a costly endeavor, so it’s important to understand which sounds are potentially dangerous and which ones are not.

Water heater noises are rather frequent, and they are typically a sign that you will need to take action to resolve the issue at the very minimum.The following is a list of the most often reported water heater noises, as well as possible remedies that you, as a homeowner, may be able to put into action.We hope this information will assist you in determining what measures you should take to ensure that your water heater is operating at peak performance.

Your Water Heater might be Making Rumbling, Crackling, or Popping Noise

Water heaters are devices that heat the water in a tank.Was it ever brought to your attention that when the water heats, little particles of silt are cooked out of the water and gather on the element tubes and anode of your water heater?Layers of sediment build up inside your tank, trapping water behind the sediment layers and causing them to overflow.Because of the rising temperature of the water, bubbles rise through the sediment deposits, occasionally breaking off pieces of sediment and causing them to become loose in the tank.You are hearing this popping or cracking sound as a result of hot water making its way through the layers of silt that have collected.Some homeowners have reported hearing a rumbling sound and are perplexed as to what it might possibly be.

The rumbling sound is caused by broken-off bits of silt spinning about in the tank’s inside space.Cleaning and Flushing a Water Heater

What Can You Do To Help Fix This?

If you hear your water heater creating cracking, popping, or rumbling sounds, it’s likely that sediments have accumulated in the tank and are causing the problem.If your water heater is less than ten years old, you may get away with using a deliming combination to flush the sediment out of the tank, followed by a thorough flushing and draining of your water heater to resolve the problem.It is recommended that you clean and empty your water heater once a year in order to avoid this problem.It is possible that too much sediment can affect the efficiency of your water heater, as well as the life of your water heater.A well maintained tank water heater can last for up to 15 years, however an unmaintained water heater would often fail catastrophically after roughly 10 years.If the tank is still making noises after you flush it, you may want to check the temperature setting on the thermostat.

If your thermostat is set at 125 degrees or above, the sounds may be caused by the expansion and contraction of the tank as a result of the increased temperature in the room.Reduce the temperature on your thermostat to 120 degrees or lower (this is suggested to avoid unintentional scorching) and then listen to see if the noise persists.Please keep in mind that if your water heater is more than 10 years old, attempting to delime and flush the tank may potentially cause problems within the tank itself.It’s definitely wise to start looking into what sort of water heater you’d like to use in the future and to make plans for when you’ll need to replace your current water heater.A water heater replacement is something that South End Plumbing can assist you with choosing the proper type of water heater for your needs.

Is Your Water Heater Humming?

If you are hearing humming noises, it is most likely due to a loose water heater element, which causes the water moving around the element to generate vibrations that sound like humming when it is turned on.This sort of noise should not be a source of concern.If the humming noise is bothering you and you want to get rid of it, you can have a plumber tighten the element in your water heater.If a homeowner is handy, they may also tighten the element themselves if the element is loose.

What If Your Water Heater Is Making A Hammering Noise?

This is referred to as ″water pounding″ by some plumbers.This is an actual pounding of the pipes against the wall when they are being mounted.This can occur when the pipes are not properly secured and are slapping against the studs or the inside of the wall as a result of the high water pressure.It can also be produced by the rapid switching on and off of water, such as when a toilet is flushed or when a water pump is used that does not have a holding tank to spread the flow of water at a more gradual rate.Fortunately, this is not an emergency situation, but it is likely that you will suffer some damage over time if the problem is not resolved.As a result, you shouldn’t be concerned about having to replace your water heater as a result of this problem.

The noise and knocking are not caused by your water heater, and you shouldn’t be concerned about having to replace your water heater as a result of this problem.Water hammer arrestors are available for purchase and installation by professional plumbers, which should resolve the problem.

What If You Hear A Hissing Noise At Your Water Filter?

The presence of a hissing sound is typically indicative of an air leak.In order to locate the water heater or a pipe leading to it, you’ll need to search for water or steam coming from it.A leak of this type almost often need the services of a professional plumber to repair.In circumstances when the water heater is old, it may be preferable to replace the water heater entirely.First, check to see if you have any water damage someplace, and then call South End Plumbing to have your water heater inspected and repaired.

Do You Hear Your Water Heater Making A Screeching Sound?

The high-pitched noises you’re hearing are water being driven through a small aperture under tremendous pressure.This is typically caused by a valve that has not been fully opened.Depending on where you live, the valve in concern may be located at your water heater, closer to faucets in your house, or near an appliance.The position of the valve may be determined by listening closely to establish where all of the noise is coming from.If this is the case, you may need to replace the valve on the water heater itself; be sure this is something you are experienced with or have a professional plumber do it because there is a great danger of damage due to steam burns if you do not.If the source of the noise is closer to a faucet or an appliance, you may be able to repair the valve yourself if you’re adept with a wrench or other tools.

To begin, just ensure that the water supply to that sink or appliance has been turned off before adjusting or replacing the valve.

Is Your Water Heater Making A Ticking Sound?

Tapping or clicking noises coming from your water heater are frequently caused by heat traps or check valves that have been added to ensure that water is flowing in the appropriate direction.This sort of noise can also be caused by the heating and cooling of water in the pipes.When it comes to ticking or tapping sounds, some homeowners are sensitive, and you may replace the heat trap with a dielectric nibble to satisfy them.There are several instances in which this does not ensure that the noises will cease to be heard.Knowing this, simply remember that this is not symptomatic of a serious problem; if you only rarely hear it when you’re in the room where your water heater is located, it will make the most sense to ignore it as much as possible.″If it ain’t broke, don’t attempt to fix it!″ is a popular saying in the business world.

If you have any difficulties with your old water heater, we are only a few clicks away from helping you.If you would want your water heater examined, please do not hesitate to contact us.South End Plumbing is one of the few organizations that will provide you with a no-obligation quote.To arrange an appointment, please call us at 704-919-1722 or complete the online form.

Read This Before You Buy a Tankless Water Heater

Consider the following: The method used by the majority of houses in this nation to heat water is ridiculously inefficient.Every year, we fill up large storage tanks of 40- to 50-gallon capacity with water and then continuously pump energy into them to ensure that we have hot water available anytime we want it.But, unfortunately, this is not always the case.The wait for the tank to reheat might be lengthy if a teenager is taking a long shower or the spouse is enjoying a long soak in the tub.Then there are the niggling concerns such as: Is it clogged with silt that consumes energy?Is there a chance of a leak?

Both of these worries are fair given the fact that tanks often fail between 8 and 12 years.

Tankless Water Heater Installation: Is It Worth It?

Investing in a tankless water heater has a number of benefits, as detailed above.It creates hot water just when you use it and for as long as you require it, resulting in a reduction of 27 to 50% in fuel expenses when compared to tank-type heaters.(A typical gas-fired tank wastes 40 to 50% of the fuel it burns, according to the manufacturer.) As a result, there is virtually little danger of a catastrophic leak occurring because there is no tank to collapse.Furthermore, since their introduction in the United States in the 1990s, tankless heaters have become increasingly sophisticated, with features such as built-in recirculating pumps (which provide ″instant″ hot water) and wireless connectivity, which alerts you via smartphone when a unit requires servicing.Our guide to tankless water heaters is provided below.Our tankless water heater guide will explain how they function, what you should know before purchasing one (and before the installation comes), and the idiosyncrasies of how they operate so that you won’t be caught off guard if you decide to go tankless.

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How Does a Tankless Water Heater Work?

  1. It all begins with the first turn of the hot-water faucet (1)
  2. A flow sensor (2) detects the presence of water entering the heater and sends a signal to the control panel, causing the heater to begin generating hot water.
  3. In a gas-fired unit, the control panel (3) activates the fan (4), which draws in outside air, opens the gas valve (5), which allows the gas to enter, and ignites the burner (6)
  4. in an electric-fired unit, the control panel (3) activates the fan (4), which draws in outside air, opens the gas valve (5), which allows the gas to enter, and ignites the burner (6)
  5. in a gas-fired unit, the control panel (3) activates the fan
  6. Thermal energy is captured by the heat exchanger (7), which transmits it to the water flowing through its tubing
  7. this is known as heat transfer.
  8. The mixing valve (8) is responsible for tempering the superheated water that exits the exchanger.
  9. Depending on whether or not the temperature sensor (9) detects that the water temperature exceeds or falls short of the intended setting, the panel will change the gas valve, mixing valve, and flow-regulating water valve (10) as necessary.
  10. In a sealed vent (11) (or a pair of sealed vents) through a roof or exterior wall, exhaust gases are carried away and combustion air is sent to the burner.

Thank you to the following individuals: Phillip Maxwell, Residential Product Manager, Rheem; Eric Manzano, Product Training Supervisor, Noritz; Joe Holliday, Senior Director, Product and Business Development, Rinnai; and Fred Molina, Water Heater Products Manager, Bosch Thermotechnology.

What to Know About Tankless Water Heaters

How Much Does a Tankless Water Heater Cost?

Prices range from approximately $170 for modest gas-fired units to more than $2,000 for high-output heaters that can serve two showers at the same time; $1,000 is a reasonable starting point for most buyers.Electric heaters without a tank range in price from $90 to $900.The expenses of a first-time installation are higher than the price of a simple tank replacement.Electric tankless water heater installation (see item below headed ″Installing an Electric Tankless Water Heater″).

How to Install a Tankless Water Heater

This is a work that should be left to the professionals, since it entails creating leak-free water, vent, and gas connections in the case of gas or propane units, or upgrading the wiring and circuit-breaker panel in the case of electric units, and it is best left to the professionals.

Tankless Water Heater Maintenance

Sign up to have a professional do an annual service that includes cleaning or replacing water and air filters, as well as inspecting the burner’s operation. The use of a vinegar flush every 500 hours in places with hard water prevents mineral accumulation, known as scale, from blocking the heat exchanger. That 20-minute task may be completed by a professional or by a homeowner.

How Long Do Tankless Water Heaters Last?

It is expected that gas-burning tankless water heaters would last 20 years or longer, which is two to three times longer than tank-type heaters. Tankless electric units have shorter life lifetimes, ranging from 7 to 10 years, compared to conventional units.

Where Can I Buy One?

They may be found at plumbing supply stores, big-box stores, and internet sellers, among other places. Alternatively, you may order one via your plumber.

Pros and Cons of Tankless Water Heaters

PRO: They’re Compact

As a result of new federal requirements requiring stronger insulation to decrease standby heat loss, the size of newer tank-type water heaters has increased. Consequently, they may not be able to fit into locations where an older heater with the same capacity might. Tankless gas heaters are approximately the size of a suitcase and are mounted on the wall.

PRO: They’re Safer

A tank-type heater, on the other hand, may leak and spill gallons of water if it springs a leak, but it will not house Legionella germs or topple over in an earthquake. The air supply and exhaust vents are also closed to prevent backdrafting, which would otherwise allow carbon monoxide to enter the house.

PRO: They’re Easy to Winterize

Owners of vacation homes are well aware of how long it takes to drain a water-heating tank prior to closing up a house for the season. An electric compressor may drain a tankless heater in a matter of seconds, after which it can simply be unplugged.

CON: They’re Sensitive to Slow Flow

These devices automatically shut off if there is too much scale accumulation in the pipes, or if the aerators in the faucets and showerheads get blocked, or if a turned-down faucet limits water flow to around 0.3 gpm.

CON: The Payback Takes Awhile

An annual savings of only around $100 for a household using a $1,000 tankless gas heater vs a $400 tank-type heater is possible, depending on how efficient the heater is and how much hot water is utilized. The savings, however, begin to accrue after six years, when many tanks are reaching the end of their useful lives due to the extended lifespan of tankless gas systems.

New Tankless Water Heater Technology

The advancement of tankless technology is ongoing. Here are a few of the most recent enhancements:

Higher Efficiency

Condensing gas heaters can extract up to 96 percent of the heat from a fuel, which is a 17 percent improvement over first-generation tankless devices.This is possible because of a second heat exchanger, which collects a large portion of the exhaust heat before it exits the vent.In addition to being around 25% more expensive than noncondensing heaters, condensing heaters produce acidic condensate that must be neutralized.If a heater doesn’t come with a built-in neutralizing cartridge, the installation will have to install one after the fact.

Instant Hot Water

Despite the fact that tankless water heaters heat water in around 15 seconds, you must still wait for the hot water to reach your shower head or faucet, just as you would with a tank-type heater.The recirculation pump should be used when the distance between the heater and the fixture is greater than 50 feet.This will conserve water and minimize the amount of time spent waiting.It is this pump that pushes the cold water in the pipes back through the heater.The pump can be activated by a timer, a push button, a motion sensor, a smart speaker, or a smartphone (see illustration above).The pump shuts off after approximately a minute, and you may start using hot water immediately after opening the faucet.

Wi-Fi Compatible

Tankless systems with digital connectivity let you to control the temperature as well as monitor gas and hot-water use from your mobile device.Furthermore, the device is capable of identifying the cause of a problem.Please communicate this information to your plumber so that he or she may arrive on the job site knowing exactly what has to be done.This function also eliminates the need for any guessing when it comes to determining when it is time to descale.

Tankless Water Heater Rebates: A Great Way to Save

What Size Tankless Water Heater Do I Need?

  • Here’s how the specialists ensure that your water heater produces adequate hot water: 1. A large burst of BTUs is required for a tankless heater to convert cold water into hot water in a matter of seconds. However, if a heater’s Btu output is insufficient to meet demand, it will reduce the flow rate or, in the worst scenario, offer tepid water. A plumber considers three aspects when determining whether or not a heater will be able to satisfy the demands of a household: The temperature of the water entering the heater
  • the peak demand for hot water in gallons per minute (gpm)
  • the efficiency of the heater, as indicated by its Uniform Energy Factor, which may be found in the product specifications
  • and the temperature of the water leaving the heater.
  1. The first step is as follows: A professional determines how many Btus per gallon of incoming water is required to increase the temperature to 120 degrees (see the map on the next slide)
  2. Then there’s peak demand, which is the sum of the flow rates of all of the appliances and fixtures that may be utilizing hot water at the same time, plus a little extra. (These rates are detailed in the next slide.) As a result of not bathing or washing in 120-degree water, we save around 20% on our overall use. Water-saving fixtures and appliances, as well as delaying laundry while the shower is in use, can help you minimize peak consumption.
  3. It is possible to compute the total Btu production by including the Btus-per-gallon and peak-demand statistics into the calculation. If the difference in output is between two models, go with the one with the greater Btu rating to save money. You’ll also need two smaller units that function in tandem if your output is greater than 198,000 Btus, which is the limit for domestic gas heaters.

Btus Output Estimate

  • Not interested in completing the calculations? Make a rough estimate of how much heater output you’ll want using these statistics. The following prices are for one bathroom for one to two people: 140,000 Btus
  • two bathrooms for two to three people: 190,000 Btus
  • three bathrooms for three to five people: 380,000 Btus.

Btus Per Gallon by Region

Fixture flow rates

  • Kitchen or bath faucets should flow at 1.5–2.2 gpm, while tub filler faucets should flow at 4 gpm. Dishwashers should flow at 1–2.5 gpm and washing machines should flow at 1.5–3 gpm.

How to Determine gpm?

To get the real gpm of a fixture, time how many seconds it takes to fill a bucket to the 1-quart mark and multiply that time by the number of gpm. gpm is calculated by dividing 15 by the number of seconds in a minute.

Electric Tankless Water Heater Facts

In addition to gas lines and propane tanks, tankless water heaters operated by electricity can provide the benefits of on-demand hot water to homes that do not have them.Compared to gas or propane tankless heaters, these systems, which heat water using thick copper rods, are significantly quieter and roughly a third smaller in size.And because they do not require vents, they can be fitted practically anyplace, even beneath sinks and in small closets, without compromising performance.One disadvantage of electric units is their restricted power, which reaches a maximum of 36 kilowatts, or around 123,000 Btus.In locations with warm groundwater, that amount of hot water may be sufficient to feed a whole house; but, in colder climates, they are better suited to point-of-use service, where the demand for hot water does not become excessive.Whichever model you pick, it will require a substantial amount of amperage at the main panel as well as heavy-gauge cables to function properly.

Furthermore, electric heaters have a lifespan that is approximately half that of gas heaters: Warranty periods typically range from three to five years.As soon as the heating elements fail, it is frequently more expensive to replace the complete heater than it is to simply replace the heating elements.

Tankless Water Heater Installation

What you and your plumber should look for before the installation day is as follows:

Gas Line

If you want your tankless heater to work effectively, you must connect it to a gas supply line that supplies enough volume at a high enough pressure to run the burner.In many circumstances, this will need increasing the diameter of the supply pipe to 3-4 inches in diameter.Furthermore, if the pressure is insufficient, the gas provider will be required to change the regulator on the meter.For your information, some tankless systems, like as ones manufactured by Rheem, are capable of working with a regular 12-inch gas line as long as it is not more than 24 feet in length.


Tankless gas heaters that do not condense employ stainless-steel vents that can resist high exhaust temperatures.Condensing systems feature a cooler exhaust and use PVC pipes, which are less costly than other types of exhaust.Installing a concentric vent, which has an exhaust pipe inside a larger air-intake pipe, is easier than installing a traditional vent since only one hole in the wall needs to be made.As a point of reference, vent runs have traditionally been restricted to no more than 10 feet.Higher-capacity fans, such as those found in Rinnai’s Sensei series, have enabled vents to be extended up to 150 feet.

Water Hardness

Heat transmission is slowed and water flow is restricted when scale deposits accumulate in a heat exchanger (or on electric heating components) over time.If you currently have whole-house water softening, scale will not be an issue for you.However, if your water is not being softened and its hardness surpasses 120 milligrams per liter, it is worthwhile to invest in a treatment system to remove the hardness.For your information, a specific point-of-use cartridge, such as the TAC-ler water conditioner (Stiebel Eltron), may be used to change the hardness of water without adding salt or other chemicals.

Outdoor Tankless Water Heater

  • If your environment and local rules allow it, think about the advantages of hanging a heater outside in the winter. Saves space: You won’t have to create place for another appliance in your home as a result of this.
  • Installation is straightforward: Because of the built-in exhaust vent, there is no need to drill a large hole (or two) through the side of the building.
  • Simple to maintain: A plumber can come to your home at any time, whether or not you are there. However, take in mind the following:
  • Regulations governing construction: If you want to install it outside, you may require approval from your local building department.
  • When it’s cold outside, internal heaters keep components warm down to 22 degrees Fahrenheit, but exposed water pipes must be insulated and covered with heat tape that activates automatically when the temperature drops below freezing. Southern states are less concerned about frozen pipes than those located north of the Mason-Dixon Line.

Tankless Water Heater Venting

  • Are you in need of assistance with repairs around your home? A house warranty may be of assistance. The This Old House Reviews team has put up some in-depth guidelines that you can read here: Home warranty providers that are the best<

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