Tankless Water Heater Sounds Like Water Running: Check Now!

Tankless water heaters are a convenient and efficient way to provide hot water. But, sometimes they make noises like water running or dripping. Let’s explore why this happens.

Various components regulate the flow of water in tankless water heaters. Heat traps and check valves move when the water flows through them. This can create noise due to their mechanical operation.

Also, when demand for hot water increases, the heater may need to produce more quickly. This increased flow can cause vibrations and noise in the pipes.

Sediment or mineral deposits can also lead to sounds. Minerals in hard water can build up in the heating element or other parts of the system. When hot water flows through these areas, it can cause disturbances and make noise.

Though it might seem alarming, it’s usually not a sign of a major problem. If you’re worried, contact a professional plumber for further evaluation and repairs.

Understanding the Sound Issue in Tankless Water Heater

Why is your tankless water heater making noises? It could be due to the following reasons:

  • The flow of water moving through the heating element can cause vibrations and sounds similar to running water.
  • Heat traps, installed in the unit to prevent heat loss, can sometimes make a humming or ticking sound.
  • Sediment buildup in the tankless water heater can lead to rumbling or loud noises.
  • faulty valve or high water pressure in the toilet fill valves can result in a hissing or buzzing sound.
  • Loose parts in the unit or plumbing pipes can cause a knocking or banging.
  • Water hammering, which is a sudden change in water flow, can also produce loud banging sounds.
  • Hard water with high mineral content can create residue on heaters or surfaces, causing noise levels to increase.

So if you hear a noise that seems like water running in your tankless water heater, you now have some clues to explore. And if you need help, don’t forget to call a professional plumber.

Key Notes

  • 1. Tankless water heaters are designed to provide hot water on demand, without the need for a storage tank.
  • 2. One common issue with tankless water heaters is that they can produce a sound similar to water running, even when no faucets or appliances are in use.
  • 3. This sound is caused by the flow sensor inside the water heater, which activates when hot water is needed.
  • 4. The sound can be more noticeable in quiet environments, such as at night or in a small apartment.
  • 5. While the sound may be annoying to some, it is not a sign of a malfunction or problem with the water heater.
  • 6. To reduce the sound, you can try adjusting the water flow rate or installing soundproofing materials around the water heater.
  • 7. If the sound becomes excessively loud or changes in any way, it is recommended to contact a professional plumber to inspect the water heater.
  • 8. Overall, understanding that the sound is normal and not indicative of a problem can help homeowners feel more at ease with their tankless water heater.

Possible Causes of the Sound from Tankless Water Heater

To better understand why your tankless water heater sounds like water running, let’s explore the possible causes of the sound. Water Flow and Pressure, Heat Traps and Expansion, Sediment Buildup, and Dirty Flow Sensor are the key sub-sections that will shed light on these potential reasons. By examining these factors, we can uncover the source of the noise and find appropriate solutions.

Water Flow and Pressure

Check out the table with Water Flow and Pressure data:

Water FlowPressure

We can see that different combinations of water flow and pressure can produce different results. To reduce sound disturbances, here’s what we suggest:

  1. Adjust Water Flow. If the sound is loud when water flow is high, cut it down to a medium level.
  2. Regulate Pressure. If high pressure is connected to the sound, adjust it to an optimal level.

These suggestions should help you identify and tackle sound problems due to water flow and pressure irregularities. No need for an alarm clock – just wake up to the melodious expansion and contraction of your house, like an irritated accordion player!

Heat Traps and Expansion

The phenomenon of heat traps and expansion offers insights into the sound we’re investigating. It happens in various systems and materials, causing changes in shape, size, or sound. Let’s look at a table of examples:

System/MaterialHeat Trap MechanismExpansion Effects
Piping SystemsConstricted SpacesPressure Build-up, Vibrations, Sound Generation
Metal StructuresDifferential Heating (Sunlight Exposure)Warping, Cracking, Creaking Sounds
Electronic ComponentsHeat Emission from Overloaded CircuitsComponent Malfunction, Whirring Noises

These examples show the relationship between heat traps and expansion effects. But these are just a few cases. Heat traps can be designed features or naturally occurring conditions. Some expansions aren’t audible.

In history, architects and engineers had to use techniques like expansion joints to address the challenges of heat-induced expansion. They had to design structures that could handle thermal changes without compromising stability.

By analyzing particular cases throughout history and in industries today, we can gain useful insights into this phenomenon. This helps us better understand the possible causes of the sound we’re investigating.

Sediment Buildup in Tankless Water Heater

Sediments build-up can mean trouble! They clog pipes, decrease water flow, and affect appliance performance. It can even cause uneven heat distribution in heating systems. Plus, corrosion and damage can occur over time, leading to costly repairs.

So, to prevent this mess, regular maintenance is essential. Here are some steps you can take:

  1. Flush the system and remove any sediment.
  2. Install filters or screens to trap sediments.
  3. Use water softeners to reduce mineral buildup.

These steps can help minimize the risk of sediment buildup and keep your systems running efficiently. Who knew a dirty flow sensor could make such a ruckus? Guess even machines need a good shower every now and then!

Dirty Flow Sensor of Tankless Water Heater

Accumulated dirt in the flow sensor can cause sound-related issues. Follow these 3 steps to fix it:

  1. Cut off the power supply.
  2. Take out the flow sensor carefully.
  3. Clean it with a soft cloth or brush.

Air filters can also create sound problems in some cases. So, regular maintenance is essential.

A homeowner had an annoying buzzing sound from their HVAC system. After investigation, it was found that the dirty flow sensor was responsible. The sound stopped once the sensor was cleaned.

Effects and Concerns: The sound is scary. And, we don’t know what’s causing it. Is it alien tech or angry squirrels?

Effects and Concerns regarding sound issue in Tankless Water Heater

When it comes to tankless water heaters, there are a few effects and concerns you should know about. Here are some common problems and potential solutions.

  • Hot water heater making noise? This could be due to changes in water flow or loose parts within the unit.
  • Water hammering? This occurs when the flow of water is abruptly stopped, causing pressure waves that make pipes vibrate and create a knocking sound.
  • Sediment buildup? This accumulates over time at the bottom of your tankless water heater and can cause noise as the heating element heats the residue and water.
  • Hard water issues? Mineral deposits can build up inside your tankless water heater and lead to overheating and hissing noises.
  • Water pressure problems? Low or high pressure can cause noises in your tankless water heater. A malfunctioning check valve or other plumbing issues could be to blame.
  • Possible leaks? If you hear running water but don’t see any obvious signs of a leak, investigate further. Hidden leaks within the walls or pipes might be causing the sound.

Every situation is unique, so contact a professional plumber to diagnose and address any issues with your tankless water heater correctly. If you hear unusual sounds coming from yours, seek professional advice.

Troubleshooting Steps: Let’s figure out why your tankless water heater sounds like a marathon runner’s bathroom break. Contact a licensed plumbing expert to replace any faulty components and make the noise disappear!

Steps to Troubleshoot the sound issues in Tankless Water Heater

To troubleshoot the issue of your tankless water heater sounding like water running, follow these steps. Check for loose parts, inspect pipes and valves, clean or replace heat traps, flush the system to remove sediment, and clean or replace the flow sensor. These solutions will help identify and resolve any underlying problems causing the noise in your water heater.

Check for Loose Parts of Tankless Water Heater

Checking for loose parts is very important when troubleshooting. Carefully examining the different pieces of a system can make sure everything is secure and prevent issues.

To do this, follow these 4 steps:

  1. Look for signs: Inspect the system and its parts. Check connections, screws, bolts, and other fasteners to see if they are tight.
  2. Shake or move components: Give the system a gentle shake or move the parts slightly. Listen for rattling noises or movements that could mean loose parts.
  3. Test functionality: Test each component to make sure buttons, switches, levers or other elements work properly.
  4. Secure loose parts: If you find loose parts, take action to secure them. Use the right tools to tighten screws, bolts, or fasteners.

Sometimes specialized knowledge and tools are needed to check for loose parts. If so, get professional help to avoid causing damage.

Checking for loose parts regularly will help prevent major problems. Don’t wait – start today!

Inspect Pipes and Valves of Tankless Water Heater

Pipes and valves are key to a system running smoothly. Inspecting them regularly is vital to excellent performance and avoiding potential issues.

Inspecting Pipes and Valves:

  1. Start by checking for any leaks, corrosion, or damage.
  2. Check alignment and ensure connections are secure. Examine handles/levers for ease of use.
  3. Test the valves by opening and closing – listen for any unusual sounds or vibrations.
  4. Look for any obstructions near pipes and valves that may affect their performance.

Also, be aware of manufacturers’ maintenance requirements and schedules. These vary according to the type of pipes and valves.

Pro Tip: Make a record of inspections, findings, repairs, and dates. This will help for future reference and in spotting any repeating issues. Heat traps? Time for a clean-up or replacement – to keep the water heater steaming, not scheming!

Clean or Replace Heat Traps of Tankless Water Heater

Cleaning or replacing heat traps is a must for a healthy heating system. Heat traps are designed to stop heat from escaping and use energy more efficiently. Keeping them clean and fully functional ensures the best performance and avoids possible problems.

Here’s a step-by-step guide:

  1. Cut off the power: Before any maintenance, switch off the power for safety.
  2. Find the heat traps: See where the heat traps are located around the water heater or boiler.
  3. Take them out: Carefully detach the pipes using adjustable wrenches – there may be hot water in them.
  4. Clean the heat traps: Use a brush or damp cloth to get rid of dirt, sediment, or debris. Make sure everything is good and clean before replacing.
  5. Check for damage: Inspect for cracks, leaks, or other issues. If there are any, replace the heat trap.
  6. Reinstall or replace: Connect the heat traps to the pipes with wrenches. If needed, buy new ones from a trusted supplier and install according to the instructions.

Regular maintenance is a must to prevent heating system issues. Cleaning or replacing heat traps on a regular basis helps maximize energy efficiency and guarantee smooth operation.

Also, consider adding insulation around the hot water pipes for added energy savings. Insulation helps keep hot water temperature and decreases waste, resulting in lower energy bills.

To sum up, cleaning or replacing heat traps is an essential step to maintain your heating system. Following the steps and adding insulation can boost energy efficiency and make your home or workplace more comfortable.

Flush the Tankless Water Heater System to Remove Sediment

To keep sediment out of a system, flushing is essential. This helps to get rid of any impurities that may be present and helps the system work properly. Here’s a step-by-step guide for how to flush the system and get optimal performance.

  1. Start by turning off the power supply. It’s important to make sure the power supply is off before beginning, preventing accidents.
  2. Close all valves and faucets. This will help the sediment stay in the system and make it easier to remove.
  3. Attach a hose to a drain valve. Find the drain valve and attach a garden hose to it. Make sure the other end leads to a proper drainage area.
  4. Open the drain valve slowly. Open it gradually to prevent any sudden flow or damage to the pipes.
  5. Flush with clean water. Keep flushing for a few minutes until all sediment is gone.

The process might need to be done multiple times, depending on the amount of sediment. Also, maintaining and periodically flushing will help prevent sediment buildup and get the best performance.

It is important to understand why these steps are necessary. Flushing with clean water helps get rid of sediment particles, avoiding blockage in valves, faucets, or pipes. Closing the valves and faucets keeps the sediment inside the system when flushing.

In conclusion, following these steps will help keep sediment out of the system and make it work well without any issues. Regular maintenance and periodic flushing will also keep the system healthy and efficient in the long run.

Clean or Replace the Flow Sensor of Tankless Water Heater

Clean or replace the flow sensor – an important step! Here’s a guide to help:

  1. Turn off power first – to avoid accidents.
  2. Locate the flow sensor – usually near the water line.
  3. Remove the cover – use tools, remember the parts.
  4. Clean the sensor – check for dirt, debris and residue. Use a soft cloth or brush and water. Don’t damage the delicate components.
  5. Replace if needed – consult your product manual for guidance.
  6. Test and restore power – once everything is reinstalled.

Remember to inspect and maintain your flow sensor regularly!

A tale to tell – a residential irrigation system had reduced water pressure. Diagnosis revealed debris had accumulated in the old flow sensors. Cleaning them solved the problem.

Keep your flow sensors clean or replace them when needed. That’ll prevent issues and ensure optimal performance. Don’t wait ’til things get weirder – seek professional help beforehand.

When to Seek Professional Help to resolve sound issue of Tankless Water Heater

If your tankless water heater is making noises like water running or dripping, it’s best to call a professional plumber. This could be because of the heating element or sediment buildup. Ignoring these sounds can lead to further damage and potential leaks.

Also, if you hear loud banging or knocking, it could be caused by pressure in the pipes, loose parts, or a malfunctioning valve. A pro can inspect the unit and identify any issues before they become major problems.

Proactive maintenance is key when it comes to your tankless water heater. Contact a licensed plumbing expert if you’re concerned about unusual sounds coming from it. With their expertise, any underlying issues can be addressed and your hot water supply can remain uninterrupted for years!

Preventive Measures regarding Tankless Water Heater

To stop noises from your tankless water heater, follow these

  1. Check valves and pipes for obstructions. Blockages can lead to noise.
  2. Flush and clean the system often. Sediment buildup causes noise.
  3. Install heat traps. This will reduce heat loss.
  4. Call a professional for maintenance. They can spot potential issues.

Also, keep up with water pressure, fix leaks straight away, and use a check valve to stop backflow. These methods will help stop noise in your tankless water heater.

In conclusion, if you hear water running, it’s just your appliance showing off – ‘The Real Housewives of Hot Water’!

Frequently Asked Questions

1. Why does my tankless water heater sound like water running?

When you hear your tankless water heater sound like water running, it is most likely due to the normal operation of the unit. Tankless water heaters require a constant flow of water to heat, and as a result, you may hear the sound of water moving through the pipes.

2. Is it normal for a tankless water heater to make noise?

Yes, it is normal for a tankless water heater to make noise. The sound of water running or dripping is often heard as the water heater heats and circulates the water. However, if the noise is excessively loud or there are other unusual sounds, it is advisable to have a professional plumber inspect the unit.

3. What are some possible causes of a tankless water heater making noise?

There are several possible causes for a tankless water heater making noise. These include the movement of water through the system, the heating element activating, changes in water flow, heat traps expanding or contracting, and sediment buildup in the unit.

4. How can I tell if the noise coming from my tankless water heater is a sign of a problem?

If the noise from your tankless water heater is unusually loud, sounds like banging or knocking, or if it persists for an extended period, it may indicate a problem. Other signs to look out for include a decrease in hot water supply or leaks around the unit. In such cases, it is recommended to contact a professional plumber for inspection and potential repairs.

5. Can sediment buildup in my tankless water heater cause noise?

Yes, sediment buildup in a tankless water heater can cause noise. Over time, minerals and debris can accumulate in the unit, leading to a reduction in efficiency and the formation of sediment. This buildup can result in noises such as hissing, popping, or rumbling. Regular maintenance and flushing of the unit can help prevent or alleviate this issue.

6. Should I be concerned if my hot water heater sounds like running water?

In most cases, if your hot water heater sounds like running water, there is no cause for concern. As mentioned earlier, tankless water heaters require water flow to operate, so it is normal to hear water moving through the system. However, if you notice any other unusual symptoms or if the noise becomes excessive, it is best to consult a professional plumber for an evaluation.


Tankless water heaters often get praised for their energy efficiency and constant hot water supply. But, it’s not odd for them to make some noise during use. If your tankless water heater makes a sound like running water or dripping, you may be wondering if this is regular or if there’s an issue.

The noises your tankless water heater makes are usually caused by the flowing of water through it and can vary depending on things like the type, age, and setup quality. Generally, these noises are harmless and don’t suggest any major issues with your heater.

A potential reason why your tankless water heater may make noise is because of heat traps. Heat traps are put in the pipes to stop heat loss. When water goes through these heat traps, it can result in a gurgling or rushing sound. This sound is normal and should not be a worry.

Also, changes in water flow can make your tankless water heater sound like running water. When you turn on a tap or shower, the sudden rush of water through the pipes can create a noise that resembles running water. This is normal and just a result of the system working like it should.

It’s important to remember that while some noise from your tankless water heater is okay, too loud or strange noises could indicate a problem. If you hear rumbling, hissing, or banging coming from your unit, it’s good to contact a professional plumber for more investigation. These noises might be signs of sediment buildup in the system which can reduce its effectiveness and cause possible damage if it’s not dealt with.