Phone Number: 07852 583 351

How do you know if you need a new boiler

  • Posted by:
  • Admin
  • Tags:
  • Posted date:
  • 10-05-2021
How do you know if you need a new boiler

When Does a Boiler need Replacing?

There is no specific amount of time you need to replace your boiler. If you maintain your boiler well and book regular services, then you shouldn't need a new boiler for a long time. However, if you spot the warning signs associated with a broken down boiler, you should get in touch with a professional, and you will need a new boiler. 

Here is a list of the main signs you need to look out for. If you spot any of these signs, you may need to either replace your boiler or have it repaired:


Your boiler breaking down a lot

Do you have to call a Gas Safe registered Engineer out every year? The amount you are paying for the repairs, you could probably afford a replacement.


Your bills are getting more expensive, and you don't know why

If your energy efficiency rating drops, then your energy bills will be more expensive.


Your boiler or radiators makes unusual noises

Central heating systems do make a lot of noises anyway, but if you notice the noises are different, more frequent or louder, then you may have a sludge build-up. 


The blue flame is yellow

When your boiler burns, it should have a blue flame. If you notice it has turned a yellowy-orange colour, then you will need an immediate emergency service. Your boiler flame should burn bright blue.If it’s changed to a yellow or orange colour, your boiler needs service immediately from a Gas Safe registered engineer. They’ll be able to tell you how serious the problem is and the best way to resolve it.  


When you turn your boiler on, it has a funny smell

A bad smell from your boiler usually smells like egg or like sulphurous smell.


Frequent leaks from your boiler

Your boiler shouldn't leak under any circumstances, so if you spot a leakage, then you need to get in touch with a professional as soon as possible.


You can't find the replacement parts

The older your boiler is, the harder it will be to find parts to replace your broken ones. This means that you won't be able to fix your boiler, so you will need to buy a new one.


If your boiler isn't working as well as it used to, then you may need to buy a new one.

If your boiler isn't working as well as it used to, then you may need to buy a new one. Please don't forget to get in touch with a Gas Safe registered engineer if you spot any of the signs listed above.

Boiler Warning Signs

Even though it can massively vary, the average boiler lasts until it's about 15 years old. Here are the main warning signs you need to look out for. If you do spot any of these signs, but leave them too long before doing anything about them, then you will most likely need a boiler replacement. Please get in touch with a professional as soon as you spot any of the following:

Boiler Pressure

If your boiler pressure falls below the 1 bar, then this can cause a faulty boiler and is usually the main symptom of a leak in your central heating system or if you have recently bled your radiators. 

Boiler Leakages

Corrosion in your boiler can cause leaks in your boiler, and you'll need a qualified engineer to fix it, and you will most likely need a replacement if the leak is severe. 

Dark Marks

If you notice any dark marks either on or around your boiler, then there could be a fault with your boiler's burning function. There could either be a blockage, or the seals could be broken. 

Unusual Smells

The dark marks on your boiler could lead to unusual foul odours and cause carbon monoxide to leak from your boiler. Your boiler will break down in the long run, so please get in touch with a professional. 

Irregular Noises

If there is air in the system, you have a faulty pump, low water pressure, or a build-up of rust, sludge or limescale; then your boiler may start making irregular noises. 

Unreliable Heating and Hot Water

Unreliable heating and hot water will mean your money is getting completely wasted. Your energy bills will be more expensive due to your energy efficiency rating dropping. This problem can be caused by the following:

Faulty Valves

Broken Parts

Low Pressure

Defective Thermostat

Carbon Monoxide Detection

Carbon monoxide can be so dangerous, which is why if your boiler detects carbon monoxide, you need to call a professional straight away. Also, make sure you open your windows. Symptoms of carbon monoxide poisoning include:



Sore Tummy


Chest Pain


How Often should you Replace your Boiler UK?

Most boilers last on average around 15 years, but if there is nothing wrong with your boiler, then there's no need to replace it. Providing you have your boiler serviced regularly and keep up with any necessary maintenance and repairs, your boiler should last for longer. 

However, if you spot any warning signs, your energy efficiency rating has gone down, you need to replace your boiler. If your boiler needs replacing, you will usually spot at least one of the following:

  • Your energy bills increasing.
  • You can't find any replacement parts for your boiler
  • Your boiler is causing structural damage to your home
  • You feel as though the heating isn't on (you feel cold in your home)
  • You're waiting a while for your boiler to turn on 
  • Your energy efficiency rating has gone down
  • You can hear irregular noises
  • You can smell foul odours
  • When is it Time for a New Boiler

    If your boiler shows signs of low pressure, noise during operation, the boiler breaks down frequently, your blue flame turns yellow, you can smell irregular odours, or your energy bills have started to get more expensive for unexplained reasons, then it is time for a new boiler.

    If you have problems with your boiler and are worried about needing a replacement, please don't hesitate to contact a professional today. They will give you the advice you need and will come out and check your boiler for you. It is also important to remember that you need to have your boiler regularly serviced to prevent an emergency replacement. 

    What Happens When a New Boiler is Fitted?

    If your boiler is ready to be replaced, you need to call a professional to install your new boiler for you. It is important to get a professional to do this job, as they need to ensure the boiler is the right size to fit your home. 

    Here of the steps taken on the day of your new boiler installation:


    Firstly, everything will be cleaned and checked for safety hazards


    Then, the engineers will remove your old boiler


    Now, they will install your new boiler


    The engineers will cleanse your system


    Installation of your Smart thermostat, if necessary


    Lastly, the professional will check over everything

    Now, you will be given a handover pack with manufacturers instructions, an electrical, minor works certificate, a gas certificate and a building notification. You will also get a 12-month workmanship guarantee and a 10 years manufacturer's guarantee (but this can differ depending on your package).

    How much Does a Boiler Cost the UK?

    In the UK, boilers cost between £1,500 - £4,800. The price depends on how far the professional needs to travel to do the installation, the boiler's size, the type of boiler, and the company. Here are the average prices of the different types of boilers in the UK:

    Gas Combi

    £ 600-2,000  

    Gas Heat-Only

    £  1,800-3,200

    Gas System

    £ 1,600-2,900

    Oil Combi

    £  2,000-2,600

    Oil Heat-Only

    £ 2,500-3,800

    Oil System

    £  1,500-3,500

    Should I Install a Combi Boiler?

    One of the biggest advantages of installing a combi boiler is that you don't need to give water tanks, freeing up some space in your house. This is because combi boilers don't produce or store hot water unless you need it; with conventional boilers, hot water is produced around twice a day. This saves a lot of money on your heating bills. 

    So, if your boiler is making sounds, your boiler takes longer to warm up, or your boiler is leaking, then it could be time for a new boiler. Consider replacing your boiler with a combi boiler, instead, which could save you a lot of money on your heating bills. 

    If you are considering a boiler replacement in the Southampton or Hampshire areas, get in contact with our heating engineer today.