The Most Common Signs That Your Hot Water Cylinder Should be Replaced


Your hot water cylinder NZ is marvellous when it’s working and a nightmare when it isn’t. Especially in colder weather, losing access to modern comforts like a warm shower can be particularly devastating to your mood and general sense of comfort at home.

If you want to avoid getting yourself caught in this kind of situation, the best thing to do is to keep a close eye on your hot water cylinder NZ so that when you identify an issue you can call a plumber and get them to inspect it. If the issue is bad enough, it may warrant the replacement of your entire system.

Let’s take a look at some of the most common signs that your hot water cylinder NZ is having trouble and may need to be totally replaced.


It’s old

Most sales of new hot water cylinders NZ result from the need to replace an ageing unit that is showing signs of failure. When installed into a plumbing system with a high level of quality H20, an average unit will last around 10 years or so. If you unit has reach this age or exceeded 10 years of age, it might be time to start looking for a replacement before big problems start to arise.

Many people still have older systems that were not originally mean to supply so many appliances like dishwashers and washing machines. This can cause strain on the system and will lead to faults down the line.

If you are aware that your system is ageing, it’s a good idea to look into replacing it.


Discoloured H20

If you begin to notice your heated H20 is coming out a rusty, red or brown colour then it’s a definite sign of corrosion inside of your hot water cylinder. This normally occurs when the sacrificial anode isn’t replaced often enough.

The sacrificial anode is a special strip inserted in the tank that is designed to absorb all of the internal corrosion. Obviously, this anode needs to been replaced routinely in order to prevent the tank itself from rusting.


It’s not heating correctly

If your hot water cylinder NZ is failing to produce heated H20 at a reliable frequency then it’s obviously not doing you any good whatsoever. This is normally noticed when liquid begins to turn cold randomly during a shower or when it simply doesn’t get to the same temperature it used to.

The best thing to do in this situation is to call a plumber to see if there is a problem with your thermostat or heating element. If they are able to secure replacement parts for you, then you may not need to replace the entire system.


You are beginning to hear strange sounds coming from the tank

If you notice that your hot water cylinder NZ is generating a large amount of noise, normally a sizzling sound, then you should probably take a closer look at it. It may need to be totally replaced, but the issue could also be caused by a faulty relief valve and this can usually be easily replaced by an experienced plumber.



This is obviously a major issue for more reasons than just the efficiency of your hot water cylinder NZ. Depending on where your unit is and the severity of the leak, significant structural damage to your home could be caused if left unchecked. Also, damp areas of the home caused by a leak are breeding grounds for mildew and mould which can present serious health consequences for anyone living there.

There are several places where a leak could manifest and it’s usually a good idea to get a plumber to come over and assess the extent of the issue.