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Is it time to replace your gas boiler?

5 reasons why you should consider it

It will not surprise you to learn that I’m often asked: ‘Samuele, when should I consider replacing my boiler?” The short answer is: As seldom as possible. The main reason being: cost. But when talking about the cost of a replacement, a seesaw of economics comes into play and you have to find that crucial balance in order to make the right decision.

To help you, I’ve put together my top-5 considerations when thinking about replacing your gas boiler.


1. It’s more than 10 – 15 years old
A well-maintained boiler can easily last up to 10 – 15 years. However, after this length of service, its efficiency will ultimately begin to decline. According to the Energy-related Products Directive (ErP), modern boilers boasting A-ratings for efficiency, means they utilise at least 90% of the energy they consume. Note: You won’t ever achieve 100% efficiency, even when the boiler is brand new.

Older boilers, often termed ‘G rated’, can waste a significant amount of energy, running at 70% efficiency, equating to huge energy losses, and higher utility bills. Replacing your boiler with a new, energy-efficient model could save £1000s over the course of a year.

Most plumbers will be able to gauge the efficiency of your boiler and give you a relatively accurate percentage figure. This is done by assessing the boiler data plate and seeing how much kilowatt input of gas it consumes versus how much kilowatt output in heat it produces. For example: if it gives 100kW of gas and it produces 70kW in heat, it will be running at 70% efficiency.


2. Too many repair and service call-outs
As your boiler ages, breakdowns will ultimately become more frequent. General wear and tear and the build-up of dirt internally, all contribute to having to carry out the odd service from time to time.

But if your boiler seems to require a fix every other month, it’s a strong indication of trouble. Consider the cost of repairs compared to a boiler replacement. Sometimes, multiple repairs within a short period can outweigh the upfront cost of a new boiler, especially when factoring in the increase in efficiency and potential warranty coverage offered by a new one.

Many boiler manufacturers only provide a 2-year warranty and, think carefully before signing up to one of those third-party extended ones. Any repairs outside this period are certain to cost you money.


3. Brittle and failing components
Over time, the constant heating and cooling cycles take their toll on your boiler’s internal components. Plastic parts, in particular, can become brittle and more susceptible to cracking or failure.

These failures can lead to leaks, pressure issues, and even complete boiler shutdown. Replacing a boiler before these components reach their critical point can prevent a potential disaster and keep your home warm and safe.


4. Inconsistent Heating and Hot Water
I cannot stress enough how important it is to ensure that your home is draft proof and, your double glazing is still up to the job. Afterall, there’s no point in having a super-efficient boiler if all that energy is literally flying out of the window. If you’re finding that your thermostat is cranked-up, yet your home still feels unreasonably cold, you need to check that first. Likewise, before you panic about your hot water temperature, first check your boiler pressure before making any decisions.

If those things are all good, the issues could indicate a failing heat exchanger, which is a vital component responsible for transferring heat from the burner to your water supply. A malfunctioning heat exchanger can be expensive to repair, and in some cases, a boiler replacement might be the only viable solution.


5. Peace of Mind and Safety
No doubt about it, a new boiler will give you peace of mind.
Modern boilers are equipped with advanced safety features, such as automatic shut-off systems and flue gas monitoring. Replacing an older boiler with a newer model means your home adheres to the latest safety standards and reduces the risk of potential hazards like carbon monoxide leaks.


A proactive approach can save you money in the long run and ensure your home stays warm and comfortable for years to come. Give us a call on 020 8945 745 or use the contact form to book a professional boiler inspection.

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