The Most Common Signs You Need to Replace Your Hot Water Heater

Noticed rising bills, lukewarm water, strange noises, or rust? These are signs it’s time to replace your hot water heater. Upgrading can help save on energy costs and keep the hot water flowing smoothly.

Did you know that, according to DCCEEW figures, water heating accounts for 15 to 30% of our average household energy use in Australia? This may seem insignificant for some, but for others, these costs can really add up.

Although adopting a few water-saving measures is a great way to save money, getting an older hot water unit replaced is also a good idea! With that in mind, this article is going to cover some of the most common signs you need to replace your water heater. 

From gas to electricity and solar, we’ll cover all the important things you need to know!

Age

This is one of the clearest indicators that it’s time to consider replacing your hot water heater. Whether gas, electric, or solar, most hot water systems have an expected lifespan of around 8 to 10 years. Over time, wear and tear take a toll on the internal components. This leads to reduced efficiency, higher energy consumption, and eventually, system failure. If your unit is nearing or surpassing that 10-year mark, it’s a good idea to start thinking about a replacement.

You can easily check the age of your system by looking at the manufacturer’s sticker or label, which is typically found on the upper part of the unit. Being aware of this timeline allows you to replace your unit before it fails unexpectedly, saving you from the inconvenience of being without hot water or facing sudden repair costs. 

Newer systems are often more energy-efficient and last longer, so upgrading could also lead to significant savings on your monthly power bills. Solar hot water systems, for example, can last for more than 20 years.

Inconsistent Heating

Have you noticed inconsistencies with water temperature as you take a shower or attempt to do the dishes? Is it suddenly going from too cold to scalding hot within seconds? Inconsistent water heating is a common sign that your hot water heater is on its way out. This problem typically occurs when the system’s heating elements start to wear out. Another likely cause is sediment buildup in the tank, which interferes with the heater’s ability to regulate water temperature effectively.

While this issue might seem like a minor annoyance, it can actually be a sign that your heater is struggling to keep up with demand, especially during high-usage times like mornings or evenings. 

Over time, the problem is likely to worsen, leading to increased energy consumption and further inefficiencies. Replacing your system with a newer, more reliable model can provide you with consistent hot water and peace of mind.

Sick of inconsistent temperatures? We’re the go-to team for hot water repairs in Nunawading, Malvern, Mount Waverley, Box Hill, Coburg, Oakleigh, Mornington Peninsula and all corners of Melbourne.  

Unusual Odours

If you notice a strange smell coming from your hot water, particularly if it’s metallic or has a sulphur-like scent, this could be a warning sign that something is seriously wrong. Unpleasant odours in your hot water are often caused by bacteria buildup or corrosion within the tank. When bacteria accumulate they can create hydrogen sulphide gas, which gives off that characteristic “rotten egg” smell.

Another cause could be a failing anode rod, a component that helps prevent corrosion by attracting harmful minerals. When the anode rod stops working properly, the tank can rust from the inside out, leading to smelly, rusty, or discoloured water. If you’ve noticed these odours, it’s important to have your water heater inspected, as this problem is unlikely to resolve on its own. 

In many cases, it’s a clear sign that your system needs to be replaced.

Strange Noises

A hot water heater that’s in good working order should operate quietly. If you start hearing strange noises like popping, rumbling, or banging coming from the tank, it’s likely due to sediment buildup. Over time, minerals and debris may all accumulate at the bottom of the tank, which hardens when heated and causes these noises. The rumbling sound is usually the result of the sediment being moved around as water is heated while popping sounds can indicate that air is being trapped in the sediment.

These noises are more than just an annoyance—they’re often a sign that your water heater is struggling to function properly. If left untreated, the sediment buildup can reduce the efficiency of your heater and even lead to tank damage. While flushing the tank is a viable solution in some cases, persistent noises might indicate that the system is beyond repair and needs to be replaced.

Low Water Pressure

If you’re experiencing low water pressure after you turn on the hot water tap, it could be the result of a failing water heater. Once again, sediment buildup is likely to be the prime suspect. This sediment will then get inside the tank or pipes and restrict the flow of water. This issue can reduce your system’s overall efficiency, as well as make it harder to enjoy a steady stream of hot water for showers, washing dishes, or other household tasks.

While low water pressure is sometimes brought about by other plumbing issues, if it only happens when using hot water, it’s likely due to a problem with your water heater.

Leaks

One of the most serious signs that your hot water heater needs replacing is the presence of leaks. Even small puddles around the base of your water heater can indicate further problems, such as fractures in the tank caused by metal expansion and contraction during heating cycles. In some cases, the issue could be related to a malfunctioning pressure relief valve or loose connections. Regardless, it’s important to address any leaks as soon as possible to prevent water damage to your home.

Once a tank starts leaking, there’s usually no way to repair it, and replacement is the safest option. Ignoring leaks can lead to more significant problems, including flooding, which can damage your home and belongings. If this situation applies to you, reach out to us for affordable hot water repairs across Melbourne.

Rusty Water

When rusty or discoloured water starts to stream out of your hot water taps, this could be a sign that your water heater’s tank is beginning to corrode. In this case, the underlying cause will be rust that has begun to build up inside the tank, especially if the anode rod has failed. Once the tank starts to rust, it’s only a matter of time before leaks and other issues occur, and organising a replacement is often the best course of action.

If rusty water is only present when you use hot water, it’s almost certainly an issue with your water heater. However, if both your cold and hot water are discoloured, the problem could lie in your plumbing. Either way, it’s a good idea to call a professional to assess the situation.

Substantial Utility Bills

If your bills have been creeping up lately (either water, gas or power), and there’s no obvious explanation, your hot water heater could be the culprit. As water heaters age, they become less efficient, requiring more energy to heat the same amount of water. 

Replacing an old, inefficient water heater with a newer, energy-efficient model could significantly reduce your monthly bills and household expenses. With higher star ratings and superior designs, modern water heaters are designed to heat water more effectively while using less energy. This then translates to long-term savings on your utility costs.

What Should I Do Next?

Once you’ve noticed any of the signs above, the most important part is not to ignore them. Replacing your water heater before it fails can save you from unexpected cold showers, water damage, and higher repair costs. Consulting the MCN Plumbing team is the best way to assess whether your system needs to be repaired or replaced. 

When your hot water unit is playing up, there are two main avenues available–repairs or replacement. At MCN, we can provide professional and honest advice on the best option for your needs.

In most cases, hot water repairs and services will be enough to get your hot water back to its best. However, if you have an old or damaged hot water unit that needs constant repairs, a replacement hot water system might be the most affordable long-term option.

What Are My Options for Replacing the Water Heater?

There are several options available when it comes to replacing your hot water heater. From traditional electric or gas systems to heat pump, solar and instantaneous, the “right” choice will depend on your home’s specific needs and your budget. 

How Can MCN Plumbing Assist?

At MCN Plumbing, we understand how essential a reliable hot water heater is for your comfort and daily routine. 

Whether you’re dealing with an old, inefficient system or suspect your heater is on its last legs, we’re here to help. Our experienced plumbers can assess your current system, provide advice on replacement options, and carry out installations with minimal disruption to your home.

Get in touch with us today for hot water repairs and hot water installation services across Melbourne.