Here at Green Flame, we are often asked ‘what is the lifespan of a boiler’?  The answer isn’t as simple as the question, in all honesty, because there are a lot of differentials that need to be considered.  However, that said, we’re going to take a look at what we can do to extend the life span of a boiler.

A blanket answer to the question what is the lifespan of a boiler is that it depends on the type of boiler you have.  Conventional gas boilers usually last between 10-15 years, if they are well maintained and serviced regularly.  Superior qualities may in fact last up to 20 years, but a lot depends on how you look after it over those years.

But, as with everything in life, the better you look after it, the longer it will last. A boiler is an expensive but necessary appliance in most homes, so it’s important that they keep working properly, for as long as possible to prevent expensive replacement before its due.


Factors affecting the question ‘What is the lifespan of a boiler’


1.  Oversized capacity


All boilers have a kW rating, but they’re not all the same!  A very large kW rating means that the boiler has to fire up and shut down very often to keep the room temperature at a certain level.  The trouble with very large boilers is that they heat up the home quickly, then shut down when the temperature is reached, then have to start up again on a regular basis.  This puts pressure on the components within the boiler itself, making them vulnerable to wearing out quicker than they should.


2.  Condition of your heating system


If your heating system is old it will put pressure on your boiler to work harder to run at the required temperature for the building, but if you have a newer, more modern heating system, the boiler doesn’t have to work as hard to keep the room temperature at a level setting.


3.  Water Quality


If the water where you live contains high levels of minerals or chemicals, it’s not great for your boiler!  Debris and mineral build up can get caught in the boiler components, making them either rust up or break down sooner than expected.


4.  No regular maintenance


A boiler will most probably change from it’s original settings over the years, which will put extra workload on the components of the boiler.  They may lose their pressure and become inefficient as a heat source.  Regular servicing by a qualified engineer will put the settings back to their original positions.

We can’t stress strongly enough that failure to have regular boiler checks is probably the biggest reason why a boiler doesn’t last as long as it should.

If you’re noticing these things happening, it’s probably about time you considered a new boiler:

  • Rising energy bills – you’re boiler is burning more energy trying to maintain the correct temperature
  • Frequent breakdowns – this is self explanatory!  You simply know it’s time to change your boiler!
  • Discolouration of the pilot light flame – it to glows yellow instead of blue, then you’ve got a carbon monoxide problem.  Your boiler is leaking carbon monoxide and you need to URGENTLY get this dangerous situation sorted out immediately
  • Consider the age of the boiler and it’s declining efficiency
  • If you have a noisy boiler or faulty controls

But, your boiler can last longer if you……..


  1.  Choose a modern, efficient boiler of the correct capacity (kW) for the space you want to heat so that the boiler components don’t have to overwork
  2.  Monitor the temperature of your home on a regular basis to make sure the heating system is working effectively
  3.  Arrange an annual service with a qualified engineer.  It’s always best to try to keep to the same electrician as they’ll be familiar with your boiler over the years and will easily spot any change in its functioning
  4. Repair your boiler as soon as you notice any defect or something unusual
  5. Consider using magnetic filters.  These ingenious filters will help prevent sludge build up within the heating system by filtering out metallic debris
  6. Consider a ‘power flush’ – this can be done by your boiler engineer that will flush out any debris that’s built up in your boiler and heating system




So, the question was ‘what is the lifespan of a boiler?’ We hope we’ve given you a considered answer and some tips that will help you prolong the life of your boiler.  However, if your energy bills are increasing due to your boiler being inefficient, it may be time to consider a new one!

We are Green Flame – if you are in the Gloucestershire area and have any plumbing, heating or renewables queries, including boiler installation, then we can help.  Take a look at our website or give us a call on 01452 412 549 – we’d be happy to hear from you!



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