Ageing
Most hot water systems last between 8–15 years, and age is the biggest indicator of when yours may need replacing. Over time, internal components break down, reducing efficiency and performance in your home.
Factors like hard water or lack of regular servicing can speed up this ageing process. As the system deteriorates, it can produce sludge or silt, which may end up in your shower, bath, basin, sink, and appliances.
If your system is approaching the 8–15 year mark, it’s likely time to start considering a replacement.
 
Producing discoloured or smelly water
If your taps or shower start producing brown, red, or rusty-coloured water, it’s a strong sign your hot water system is breaking down. Discolouration happens when the inside of the storage tank begins to corrode, which can also cause an unpleasant taste or smell.
While corrosion is a natural process over time, rusty water can carry bacteria and may pose a health risk. It’s important to act quickly and have the system assessed or replaced as soon as you notice any water discolouration.
 
Leaking
If you notice droplets of water pooling around your hot water system, it is an obvious sign of a breakdown, and your system needs urgent service or replacement.
Unattended leaks can cause mildew or mould to grow, which can cause significant health problems. Additionally, using a leaking tank may cause flooding.
 
Noisy or making strange noises
Most hot water systems make minor noise as they heat water, but unusual sounds like hissing, popping, cracking or banging are not normal.
A hissing noise often indicates the tank has burst, while loud banging or rumbling can mean the inner lining is breaking down. This type of ongoing rumbling can eventually lead to leaks and usually signals that the system is nearing the end of its lifespan.
If these noises are persistent, it’s best to have the unit assessed — and you may need to consider a hot water system replacement.
 
Ongoing issues
If you are having constant issues with your hot water system or find it doesn’t work as well as before, it might be time to consider an upgrade. At some point, repairs won’t do much to solve your water problems, and it may cost you more than actually getting a replacement. Replacing your hot water system will not only provide you with a brand-new system that works well, but it can also be an excellent opportunity to install a more energy-efficient water heater. This could potentially save you more money and time, along with helping the environment.
 
Larger Water Bills
Your bill may be skyrocketing if a leak is somewhere in the unit. Get a professional plumber to inspect your hot water unit immediately to prevent future costly bills.