6 Signs Your Hot Water Cylinder Needs Replacing

Nobody likes to discover their hot water cylinder isn’t working properly. Whether your shower runs cold midway through, or the noise coming from deep within it is too much to ignore – signs of ailing health can mean the end of its life. But how do you know when that time has come? Knowing when to replace your hot water cylinder can be tricky, but avoiding costly ‘surprise’ replacements becomes easier with a little know-how. We’ve compiled 6 telling signs to look out for if your hot water cylinder needs replacing!

Inconsistent Hot Water

There’s nothing like the warm and soothing feeling of taking a steamy shower at the end of a long day. So, when you notice that it takes longer for hot water to reach your faucet or the water isn’t hot enough, it can be frustrating. Not to worry though, there’s likely a simple explanation for this: your hot water cylinder could be on its last legs. With daily use, your hot water cylinder experiences through a lot of wear and tear, and eventually, it will need to be replaced. It’s critical to address this issue as soon as possible, as a malfunctioning cylinder can result in even bigger problems down the line.


Have you noticed a sudden increase in noise from your hot water cylinder when it’s turned on? It could be an indication of sediment build-up. Sediment build-up occurs when minerals and other particles in the water settle at the bottom of the tank over time. This can lead to a host of problems, including reduced efficiency, increased energy costs, and a shorter water heater lifespan. Once your cylinder starts leaking due to build up, repairs are impossible and it needs to be replaced.

Rusty Water

If rusty water comes out of your hot water tap, it’s imperative to act immediately. While it might seem like a small issue, rust in your water can be dangerous for you and your family. It’s a sure sign that your hot water cylinder needs replacing. Rust is not only unsightly, but it can also lead to other issues, including clogged pipes and damage to your appliances.


A hot water cylinder can last for many years, but as it approaches the end of its lifespan, it becomes more vulnerable to leaks. A leaking cylinder not only causes water damage but can also increase your water bill. Therefore, it’s critical to address any potential issues before they become major problems. If you notice any signs of a leak, such as dampness or water stains around your hot water cylinder it’s recommended to replace your cylinder immediately.

Higher Energy Bills

We all dread receiving a higher than usual energy bill, but it can happen from time to time. This may not always be a sign of inefficiency or wastefulness on our part, as sometimes it indicates that something needs replacing. One common culprit could be your hot water cylinder.

Over time, hot water cylinders can become less efficient and wear down, which results in increased heating costs. It’s critical to keep an eye on your energy bills and be vigilant for sudden spikes. This could be a sign that it’s time to replace your hot water cylinder. Taking care of this will not only reduce your energy bill but also ensure that your hot water operates efficiently.

Age of Your Cylinder

Hot water cylinders typically have a lifespan of around 10-15 years, so if yours is reaching that age, it might be time to consider a replacement. Don’t wait until it’s too late and your cylinder breaks down. Not only will replacing your cylinder provide you with peace of mind, but it will also ensure that your home runs efficiently and safely.

These are just some of the signs that your hot water cylinder needs to be replaced. Even if you aren’t experiencing any of these issues right now, it is advised to check in on your cylinder annually. This is to make sure it runs optimally and safely. If you need to replace your hot water cylinder, the team at RLM Electrical can help supply and install a replacement cylinder. Get in touch with us today for expert advice and assistance with your hot water cylinder – we’ll be more than happy to help!

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