A commercial boiler serves to provide your heating needs and applications. Whether for commercial cleaning, sanitation, cooking, or other business operations, it has to be properly taken care of to ensure its optimal performance and overall efficiency. As the cold season is fast approaching, however, it is all the more necessary to inspect your boiler to see whether or not it’s in top shape and working condition. Unfortunately, with several warning signs showing themselves, you may start to think that a mere repair will no longer be sufficient, which is why you may consider a replacement instead. 

As you don’t want to cause any downtime or delays in your business operation during the cold season, you should be on the lookout for signs that you need a boiler replacement. Here are four tell-tale signs you should look out for:

Boiler age

The most apparent indication that your boiler should be replaced is its age. As you may or may not be aware, most modern boilers have a lifespan of 10 to 15 years. For more advanced ones, such as those cast iron boilers, they can last for up to 20 to 30 years. If your commercial boiler goes beyond its age limit, you should have it replaced before it causes any problems. Even if it’s still within the range yet already shows signs of wear and tear, it may be best to find a new one.


Boiler leaks shouldn’t be overlooked as they are signs of potential defects and internal problems. They may have possibly come from various components, such as an ill-fitting pipework, impaired seal, or even a faulty internal part. If left unattended for a long period, these small leaks can lead to the corrosion of pipework and even electrical issues. For this reason, as soon as you notice any signs of leaks, get in touch with a gas-safe-registered engineer, not just a plumber.


Kettling is the high-pitched whistling noise coming from the radiator or boiler, which is the same with what a kettle produces when boiling water. Apart from this sound, however, you may sometimes hear other gurgling, hissing, or banging sounds coming from the boiler. Keep in mind that these strange noises aren’t normal and there may be sludge and limescale build up in your boiler that hinders the flow of water, causing the noises. Be sure to inspect these irregular sounds and see if you need a boiler replacement.

Flame discolouration

For the uninitiated, a blue flame produced by your boiler means there’s no problem at all. Other than this, there may be a problem that needs to be looked at. The worst part is that any other colour than blue may have to do with incomplete combustion. Know that there’s a risk that comes with carbon monoxide exposure that can be extremely dangerous. When you see a yellow or orange flame, have your boiler fixed or replaced as soon as possible.


Before a potential disaster strikes your boiler, you should promptly seek a boiler replacement. As outlined above, be on the lookout for the following signs—age, leaks, kettling, and flame discolouration. Ultimately, it’s better to be prepared than sorry. 

If you see one or some of the signs mentioned above, it’s better to have a boiler rental in London as a viable option. That way, you can ensure uninterrupted heating applications and hot water uses in your business while checking and considering a major upgrade. At the same time, you can ensure the utmost safety in the workplace.

We’re a boiler rental company in London that also provides a wide selection of chillers, heaters, portable air-conditioning, generators, and ancillaries. If you specifically need a boiler rental, get in touch with us today to see how we can help!