If your water heater is making noise, it could be a sign of potential issues with the components within the hot water unit that need attention. Whether you have an electric or gas hot water heater making noises, understanding the type of sound and its cause can help you resolve the issue before it escalates further and leaves you with no hot water!
Continue reading for advice on how to keep your hot water system running smoothly.
Suspect a plumbing problem? Fear not, our team of local Perth plumbers are here to help! Call us today.
Why Do Water Heaters Make Noise?
Water heaters, whether gas or electric, are complex appliances with many moving parts and pressurised systems. Over time, wear and tear, sediment buildup, or even environmental factors can cause your water heater to make unusual sounds.
These noises aren’t just random, they’re your system’s way of signalling a potential issue or need for water heater maintenance. If you’ve got a storage tank system, it is also important to check the water heater tank for sediment buildup and other issues that may affect its performance or longevity.
Key Causes of Water Heater Noises
Understanding the root causes of your water heater making noise is crucial for diagnosing and resolving noisy water heater issues. Here are some of the most common reasons:
- Sediment buildup: Over time, minerals in hard water, such as calcium and magnesium, accumulate at the bottom of the tank. This sediment forms a barrier between the heating element and the water, causing popping or banging noises as the water trapped beneath the sediment heats and releases steam bubbles.
- Water pressure fluctuations: Excessive water pressure or sudden changes in pressure can lead to a hot water heater making a whistling noise. This often stems from a malfunctioning pressure relief valve or poorly adjusted inlet and outlet connections. Sustained high pressure can also damage the system if not addressed promptly by your local plumber.
- Loose components: Vibrating or unsecured components, such as the heating element, can lead to a water heater making a buzzing noise. Additionally, the water heater’s heating elements themselves can be a source of buzzing noises if they are malfunctioning or improperly installed. These vibrations may seem minor at first but can cause wear and tear on the surrounding parts, worsening the issue over time.
- Temperature changes: Metal expands and contracts as temperatures fluctuate, which can produce clicking or knocking sounds. These noises are more pronounced when a water heater cycles through heating phases frequently. While minor expansion noises are normal, persistent or loud knocking could signal deeper issues.
- Water hammer issues: Installing a water hammer arrestor can help mitigate the loud banging noises caused by water hammer, which occurs when water flow is suddenly stopped or changed direction. This solution can protect your plumbing system from potential damage.
Common Water Heater Noises and What They Mean
Water heater making noises? Here are some of the more common ones that may give you an indication of what’s going on.
Humming Noise
Humming noises can occur in various water heaters when parts, like the heating element, become loose. The vibration caused by water flowing around the loose component generates this sound. While not immediately dangerous, it should be addressed to prevent wear on the parts.
Whistling Noise
A hot water heater making a whistling noise often points to issues with air escaping through small openings or gaps in the system. Check for:
- Leaks in the inlet or outlet valves
- Damaged pressure relief valves
- Loose fittings
Banging or Knocking Noise
A hot water heater making a banging noise can be startling. This often results from sediment buildup at the bottom of the tank. The sediment traps water and superheats it, creating steam bubbles that burst with a loud bang.
Alternatively, a “water hammer,” which occurs when water suddenly stops or changes direction in the pipes, may be the culprit. Installing water hammer arrestors can help mitigate the issue.
Buzzing Noise
If you notice a hot water heater making a buzzing noise, it’s likely due to loose electrical components. Electric water heaters, in particular, are prone to this sound if the heating element or wiring isn’t secured properly.
Clicking Noise
A hot water heater making a clicking noise is typically normal and results from the heating system expanding and contracting as it heats or cools. However, persistent clicking could also mean:
- Faulty thermostat controls
- Mineral deposits causing irregular heating
Water heater noises can mean different things. Therefore, if yours is making a noise, we always recommend calling your local plumber to help you diagnose the issue!
Gas vs. Electric Water Heaters — Noise Differences
Gas Water Heater Making Noise
Gas water heaters operate using a burner to heat water, offering advantages such as lower operating costs compared to electric water heaters. Their noise profile reflects this:
- Popping or rumbling: Often caused by sediment buildup
- Whistling: This can occur if the gas supply is improperly regulated
- Whooshing: Normal ignition or burner operation
Electric Water Heater Making Noise
Electric water heaters rely on heating elements, which can lead to unique sounds:
- Buzzing: Loose electrical components or malfunctioning heating elements
- Clicking: Expanding and contracting of electrical components during operation
How to Fix a Noisy Water Heater
While many noises require professional attention, some can be resolved with simple DIY steps.
DIY Solutions
- Flush the tank: Sediment buildup can often be cleared by draining the tank. Follow your manufacturer’s instructions for safe flushing of the tank.
- Tighten loose parts: Check for and secure any loose bolts, fittings, or elements.
- Inspect valves: Ensure inlet, outlet, and pressure relief valves are functioning and tightly sealed.
- Adjust water pressure: High water pressure can be reduced by installing a pressure-reducing valve.
When to Call a Plumbing Professional
Some issues, like persistent ringing or buzzing, require the expertise of professional plumbers. Contact one of our plumbers if:
- You’re not confident in tinkering with your water heater.
- DIY fixes don’t resolve the issue.
- The noise worsens or becomes more frequent.
- You notice water leaks, rust, or other visible damage.
Contact Swan’s Plumbing for professional water heater repairs. Our experienced team assists Perth and surrounding areas with all their hot water needs.
Preventative Maintenance Tips For Water Heaters
Keeping your water heater in good shape can prevent most noise issues and extend its lifespan. Here’s how:
Regular Water Heater Flushing
You can flush your water heater tank every 6–12 months to remove sediment buildup. This is especially important in areas like Perth, where water tends to have higher mineral content.
Follow Your Maintenance Schedule
Your water heater should be professionally inspected every 6 months to ensure optimal performance and longevity. During routine water heater maintenance services, your plumber will check for leaks, flush the tank to remove sediment build-up, inspect all components, and ensure they are all functioning correctly.
Upgrading Older Water Heater Systems
Older systems are more prone to noise due to worn components and outdated technology. If your water heater is more than 10–15 years old, consider upgrading to a newer, more efficient model. Our friendly team at Swan’s Professional Plumbing can help you find the right model for your needs.
Got a Noisy Water Heater? Get In Touch With Swan’s Professional Plumbing Today
If your water heater is making noise, don’t ignore it, early intervention can save you time, money, and frustration. With decades of experience serving Perth homeowners, we provide expert plumbing services for all types of water heaters.
Ready to solve your noisy water heater issues? Contact us today for fast and reliable water heater services.
