If you hear an unsettling hiss coming from your water heater, don’t panic. This common problem likely has a simple solution. In this comprehensive guide, we’ll walk through the potential causes and fixes to stop your water heater from hissing.
If you’re short on time, here’s a quick answer: Water heater hissing is usually caused by sediment buildup in the tank or by pressure related issues. Try draining the tank, inspecting the T&P valve, and checking water pressure to fix the problem.
What Causes a Water Heater to Hiss?
A water heater making hissing noises can be a cause for concern, but it is important to understand the underlying reasons behind this issue. Here are some common causes of a hissing water heater:
Sediment Buildup
One of the most common reasons for a water heater to hiss is sediment buildup. Over time, minerals and other debris can settle at the bottom of the tank, forming a layer of sediment. When the water heater heats up, this sediment can cause steam bubbles, leading to a hissing sound.
Additionally, the sediment can also lead to reduced efficiency and a shorter lifespan for the water heater. Regular maintenance, such as flushing the tank, can help prevent sediment buildup and alleviate the hissing noise.
Faulty Temperature and Pressure Relief Valve
Another potential cause of hissing noises is a faulty temperature and pressure relief valve (TPR valve). This valve is designed to release excess pressure from the tank, preventing it from becoming dangerous.
If the TPR valve is faulty or malfunctioning, it may release steam or air, resulting in a hissing sound. In this case, it is important to have the valve inspected and replaced if necessary by a qualified professional.
High Water Pressure
High water pressure can also contribute to a hissing water heater. When the pressure inside the tank exceeds the recommended level, it can cause the water to boil and create steam, resulting in a hissing noise.
This can be addressed by installing a pressure-reducing valve or adjusting the pressure regulator. It is advisable to consult a plumber to ensure the appropriate solution for your specific situation.
Thermal Expansion
Thermal expansion occurs when water is heated, causing it to expand. This expansion can put additional stress on the water heater and its components, leading to hissing noises. To address this issue, an expansion tank can be installed, which allows the expanded water to have a place to go without causing excessive pressure buildup.
Consulting a professional plumber is recommended to determine if an expansion tank is necessary for your water heater system.
Understanding the potential causes of a hissing water heater is the first step to resolving the issue. Regular maintenance, professional inspections, and appropriate solutions can help keep your water heater running smoothly and quietly for years to come.
How to Diagnose the Source of the Hissing Sound
When your water heater starts making hissing noises, it can be a cause for concern. However, diagnosing the source of the sound can help you determine the underlying issue and find a solution. Here are a few steps you can take to identify the cause of the hissing sound:
Check for Sediment Buildup
One common cause of hissing noises in water heaters is sediment buildup. Over time, minerals and debris can accumulate at the bottom of the tank, causing the water to boil and create a hissing sound. To check for sediment buildup, you can:
- Turn off the power supply to the water heater
- Attach a hose to the drain valve at the bottom of the tank and place the other end in a bucket or drain
- Open the drain valve and allow the water to flow out for a few minutes
- If you notice a significant amount of sediment coming out, it may be necessary to flush the tank to remove the buildup
Flushing the tank periodically can help prevent sediment buildup and minimize the hissing noise.
Inspect the T&P Valve
The temperature and pressure (T&P) valve is an important safety feature of a water heater. If the hissing sound is originating from the T&P valve, it could indicate a problem with the valve or excessive pressure within the tank. To inspect the T&P valve, you can:
- Locate the T&P valve on the top or side of the tank
- Check for any signs of leakage or steam coming from the valve
- If the valve appears to be malfunctioning or releasing steam, it may need to be replaced
Consulting a professional plumber is recommended if you are unsure about replacing the T&P valve yourself.
Test the Water Pressure
High water pressure can also contribute to hissing noises in a water heater. To test the water pressure, you can:
- Attach a pressure gauge to a faucet or hose bib
- Turn on the water and observe the pressure reading
- If the pressure exceeds the recommended range (typically 40-60 psi), it may be necessary to install a pressure reducing valve
Reducing the water pressure can help alleviate the hissing sound and prevent potential damage to the water heater.
Review Other Signs of Issues
In addition to the hissing sound, it’s important to pay attention to other signs that may indicate a problem with your water heater. These signs can include:
- Inconsistent or insufficient hot water
- Leaking water around the tank
- Rusty or discolored water
- Increase in utility bills
If you notice any of these signs along with the hissing noise, it may be best to consult a professional plumber to assess and address the issue.
Remember, while diagnosing the source of the hissing sound can help you identify the problem, it’s always recommended to seek professional assistance if you are uncertain or uncomfortable with performing any repairs or replacements yourself.
How to Fix a Hissing Water Heater
Drain the Tank to Remove Sediment
If your water heater is making hissing noises, one possible cause could be sediment buildup in the tank. Over time, minerals and debris can accumulate at the bottom of the tank, causing the water heater to make strange noises. To fix this issue, you can try draining the tank to remove the sediment.
Start by turning off the power supply to the water heater and shutting off the cold water supply. Attach a garden hose to the drain valve at the bottom of the tank and place the other end of the hose in a suitable drainage area. Open the drain valve and let the water flow out until it runs clear.
By removing the sediment, you can improve the efficiency of your water heater and reduce the hissing noises. It is recommended to drain the tank at least once a year to prevent sediment buildup.
Replace a Faulty T&P Valve
Another possible cause of a hissing water heater is a faulty temperature and pressure (T&P) relief valve. The T&P valve is designed to release excess pressure and prevent the tank from exploding. If the valve is malfunctioning, it can cause hissing or whistling noises.
To fix this issue, you can replace the faulty T&P valve with a new one. Start by turning off the power supply and shutting off the water supply. Drain some water from the tank to relieve the pressure, then disconnect the old T&P valve and install the new one.
Make sure to follow the manufacturer’s instructions and use the correct valve for your water heater.
If you are unsure about how to replace the T&P valve, it is recommended to hire a professional plumber to ensure the job is done correctly and safely.
Install a Pressure Reducing Valve
If your water heater is hissing due to high water pressure, installing a pressure reducing valve can help solve the problem. High water pressure can put extra strain on the pipes and fixtures, causing hissing or banging noises.
A pressure reducing valve is installed on the main water supply line and helps regulate the water pressure entering your home. It can help protect your water heater and other appliances from damage caused by excessive pressure.
Consult a professional plumber to determine the correct pressure reducing valve for your home and have it installed properly.
Add a Thermal Expansion Tank
If your water heater is hissing due to thermal expansion, adding a thermal expansion tank can help alleviate the issue. Thermal expansion occurs when water is heated, causing it to expand and increase the pressure in the plumbing system.
An expansion tank is installed on the cold water supply line and provides a space for the expanded water to go, relieving the pressure on the water heater and pipes. This can help reduce hissing noises and prevent damage to the water heater.
Consult a professional plumber to determine if your water heater requires an expansion tank and to have it installed correctly.
Remember, if you are unsure about how to fix a hissing water heater or if the issue persists after trying these solutions, it is best to consult a professional plumber. They have the knowledge and experience to diagnose and fix the problem safely and efficiently.
When to Call a Professional
While many water heater issues can be resolved with some basic troubleshooting, there are certain situations where it is best to call a professional plumber. Here are three instances when you should consider seeking professional help:
If Sediment Flushing Doesn’t Work
If you have attempted to flush the sediment from your water heater but are still experiencing hissing noises, it may be an indication of a more serious problem. Sediment buildup can cause the water heater to overheat, leading to potential damage to the tank or other components.
A professional plumber will be able to assess the situation and determine the best course of action to resolve the issue.
For Proper T&P Valve Replacement
The temperature and pressure (T&P) relief valve is a critical safety feature of your water heater. If this valve is faulty or not functioning correctly, it can lead to a dangerous buildup of pressure inside the tank, which can cause leaks or even an explosion.
Replacing the T&P valve requires specialized knowledge and expertise, so it is best to leave this task to a professional plumber who can ensure it is done correctly.
For Pressure Reducing Valve Installation
A pressure reducing valve (PRV) is used to regulate the water pressure entering your home. If your water heater is making hissing noises due to high water pressure, installing a PRV can help alleviate the issue.
However, the installation of a PRV involves adjusting the water pressure and connecting it to the main water line, which can be complex. A professional plumber will have the necessary tools and experience to install a PRV properly, ensuring it functions effectively.
Remember, when it comes to your water heater, it’s always better to be safe than sorry. Calling a professional plumber can save you time, money, and potential headaches in the long run. They have the expertise and knowledge to diagnose and fix water heater issues, ensuring your system operates efficiently and safely.
Conclusion
A hissing water heater can be alarming, but in most cases it simply indicates an issue like sediment buildup or elevated water pressure. Following the troubleshooting tips in this article will allow you to accurately diagnose the problem and fix it yourself or determine if professional help is needed.
With the right repairs, your water heater will be back to operating quietly and efficiently.
