What Should I Do If My Hot Water Heater is Making Noise?

We all like a long, hot shower in the morning or at the end of a busy day, right? But when your hot water heater starts making strange noises out of the blue, you may feel a bit worried.

Is it telling you something’s wrong? Is it normal for a hot water heater to make noise, and just what kind of noise should you expect?

In this blog, we’ll help you understand why a hot water heater making noise might be happening and what you can do to fix it.

Understanding Your Hot Water Heater System

A hot water heater is a routine part of our homes that we tend to take for granted. But how does it work? Here’s a simple explanation to help you understand.

Basically, a hot water system does two main things: it heats the water and keeps it hot until you need it.

Let’s start at the beginning. When you turn on the hot water tap, cold water from your pipes goes into the water heater. This cold water drops to the bottom of the tank, while the hot water rises to the top, ready to be called upon when you open the tap.

Key Components of a Water Heater

A hot water heater has several key components. The water tank holds around 40 to 60 gallons of water. It is insulated to retain warmth. Inside, you’ll find one or two electric resistance heating elements, which heat the water. If your heater is gas-fuelled, there’ll be a gas burner under the tank.

Another key part is the pressure relief valve, which keeps the pressure in check. A thermostat regulates the water temperature. Dip tubes allow cold water in and hot water out.

Finally, a drain valve near the tank base lets the tank be emptied for maintenance or removal.

Gas and Electric Water Heaters

Gas water heaters work by using a gas burner located under the tank to heat the water. They require a gas line connection and sufficient ventilation. Gas heaters generally have lower operating costs compared to their electric counterparts.

On the other hand, electric water heaters heat the water using one or two electric resistance elements. They need only a power source and don’t need ventilation, making them easier to install and maintain than gas heaters.

Both types have their pros and cons, and your choice should depend on factors such as gas connection availability, utility costs, available space and your hot water demand.

Is Your HWS Supposed to Make Noise?

Water heaters are designed to deliver that perfect hot shower, but sometimes a water heater is making noises that can leave you wondering.

To help you figure out whether you need to call professional plumbers, we will cover some common water heater noises and their potential causes.

• Popping sounds: Is your hot water system going to pop? You’re most likely dealing with sediment buildup at the bottom of the water tank. As the water heats, steam bubbles trapped below this sediment layer can burst, creating that annoying popping sound. To fix this, you can try flushing the tank to remove the sediment build-up, but you may need a professional plumber’s help if the buildup is too severe.
• Hammering sounds: If you hear hammering sounds coming from your water system, it’s probably due to a water hammer. This noise occurs when water suddenly shuts off within the plumbing system, causing a sudden change in water pressure. Quick solutions include installing water hammer arrestors at the shutoff valves or adding a pressure-reducing valve to lessen the water pressure in your home.
• Ticking sounds: Ticking noises happening around your water supply might be due to loose pipe straps expanding and contracting as hot water flows through them. Inspect and tighten any loose straps, or add padding if you think the noise is caused by the straps rubbing against other structures.
• Sizzling sounds: A sizzling sound could indicate water dripping onto the hot heating elements of your hot water unit – not in the best of situations. This may signal that there’s a leak in the pressure relief valve or temperature valve, which will need to be fixed by a professional.
• Hissing sounds: Hissing noises might be due to a leaking gas line or a build-up of sediment inside your gas water heater. A sediment layer can cause steam bubbles to form and escape, creating a hissing sound. Check for gas leaks and consult a professional if you suspect it. Otherwise, consider giving your water tank a flush to remove sediment.
• HummLoaning sounds: Heard a low humming sound in your electric water heaters? It could mean the heating element is loose. Tightening the heating element should fix this problem – but remember to be cautious and turn off the electricity supply first.
• Crackling noises: Lastly, are you hearing that mysterious crackling noise? Fear not. It could just be condensation hitting the hot burner in a gas water heater. This noise is typically expected and nothing to worry about.

How to Prevent Noisy Hot Water Systems

Although some levels of noise are normal when your hot water system is in action, there are a few things you can do to prevent unsettling sounds from taking over your space.

1. Flush your water tank regularly: Sediment buildup in the tank can cause noises. Flushing the tank every six months or annually removes sediment, reducing noise and improving the heater lifespan.
2. Install a water hammer arrestor or pressure reducing valve: Water hammer noises are caused by sudden pressure spikes. Installing a water hammer arrestor or pressure-reducing valve helps control water pressure and prevents these sounds.
3. Check and tighten loose pipe straps or heating elements: Ticking or humming noises can result from loose pipe straps or heating elements. Inspect and tighten them to reduce metallic noises and ensure a smooth, safe system operation.
4. Adjust water pressure if needed: High water pressure can cause noisy pipes. Install or adjust a pressure-reducing valve to maintain steady water flow and minimise noise.
5. Monitor pressure relief and temperature valves for leaks: Regularly check these valves for leaks that could cause sizzling or hissing sounds. Fixing them promptly prevents safety issues and maintains system efficiency.

In summary, proactive maintenance can reduce noise in your hot water system and prevent larger problems. When in doubt, consult a professional plumber for assistance.

When in Doubt, Call the Professionals

If you are unsure or concerned about the strange noises coming from your hot water system, don’t hesitate to consult a professional plumber.

They will help diagnose the problem, provide expert guidance on the appropriate course of action, and fix the issue if necessary.

Here’s to Peaceful Showers

Hot water heaters can undoubtedly produce some weird noises, but understanding the cause of these sounds and addressing them will help you maintain a peaceful environment.

If you are unsure about what a particular sound means, consult a professional plumber. They will be able to provide expert advice, diagnose any problems, and fix them.

So next time your hot water heater decides to chat, you can decode the message and avoid those strange sounds.

Please note: This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See our Terms & Conditions here.