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Imagine it’s 2 a.m., and your boiler is making odd sounds, turning a quiet night into a nightmare. A yearly boiler service isn’t optional—it’s essential. Left unchecked, small issues can escalate into serious problems. Before you book a boiler service, you should know: What does a boiler service include? You can’t blindly hire someone without knowing what to expect.
In this blog, we’ll explain exactly what a boiler service covers, why it’s needed, and the details you should know. Remember: only Gas Safe-registered heating engineers can service boilers.
If your boiler malfunctions, you could face a cold snap in winter. Before it breaks down, make sure it’s properly maintained. Regardless of whether it is a combi, regular, or system boiler, an annual service is mandatory. Skipping it can void your warranty. Here’s why a boiler service matters for London homes. A boiler service-
An old or poorly serviced boiler can leak carbon monoxide, a poisonous gas-seriously threatening to health and potentially deadly. Research showed that over a hundred people a year died due to accidental carbon monoxide poisoning in England and Wales from 2010 to 2020. The worst part? Carbon monoxide is invisible and odorless. Its symptoms—headache, dizziness, nausea, confusion—can mimic flu or other illnesses, so you might not notice until it’s too late. Boiler service reduces this risk to a great extent.
An annual boiler service helps catch minor issues before they turn into bigger problems. It can save you money by preventing a full boiler replacement. Address the detected issues, and your boiler will keep running smoothly.
Whether you’re a landlord or a landlady, a boiler service is a must. If you’re a homeowner who isn’t renting the place, that law doesn’t apply to you. Either way, keeping UK homes cosy and energy-efficient should be a top priority.
The more efficient your boiler is, the lower your energy bill. Regular maintenance keeps a boiler running efficiently for years—often a decade or more. It helps keep energy bills down and provides seamless heating and hot water.
Don’t skip boiler service—skipping it can void the warranty. An annual service keeps the warranty valid, so you’ll be covered for any malfunctions or breakdowns.
If maintained properly and boiler service is performed annually, your boiler will last up to 15 years or more. Low maintenance reduces the lifespan, and the boiler gets faulty too early.
What to expect from a boiler service? It varies from provider to provider. A boiler service is the annual inspection and servicing of a boiler to keep it efficient and well-maintained. The first thing you can expect from a boiler service is an inspection.
Before they start, ask to see their Gas Safe Register ID to confirm qualifications. Even though you’re hiring professionals, you should know the standard procedures. Here are the typical steps you’ll see:
Before your heating engineer starts servicing your boiler, they’ll ask you a few questions—such as whether the boiler is making any noise or delivering consistent heating. After that, they’ll inspect the boiler and its connections. If they spot visible corrosion or leaks, those issues can be fixed.
Once they complete the exterior inspection, it’s time for the internal inspection. They remove the casing to look inside the boiler. With the casing off, the gas engineers will inspect the main injector, the burner, the spark probe (ignition electrode), and the heat exchanger. They’ll also check ignition/pilot-light issues where applicable.
The boiler’s flue pipe is connected with the boiler to the exterior vent of the house. It’s required to check the flue pipes if they are well-fitted. Also, the flue line is prone to getting blocked, especially after a cold weather period. Flue checking ensures there are no blocks or obstacles.
It’s essential to check if the fuse rating is correct. If the fuse rating is too high, that means your boiler is leading to overheating. Overheating won’t break the electrical circuit, but it will pass too much current, which will cause excessive energy bills. A high fuse rating means a faulty boiler. An annual boiler service deals with these minor faults immediately.
Without the correct gas pressure, the boiler and radiators won’t heat up properly. It should be checked, because a boiler needs the right gas pressure to operate safely and efficiently. A professional service provider can guide you to follow the manufacturer’s guidelines. Gas is the fuel for a gas boiler, and the gas supply must be up to the mark for reliable heating.
Some other things need to be checked properly. If the boiler is new and hasn’t started running, the engineer fires it up to start it on and start heating water efficiently. After that, it will be isolated by electrical test equipment. The engineer will check safety devices, functions and controls of the boiler. He will also check if the boiler is getting enough ventilation and if it’s near any flammable source.
If any issue detected when checking the boiler, the engineer will deal it immediately. That’s how an annual check helps maintain a boiler and solves issues before they can turn into a major one. Skipping a boiler service can be a huge regret. It might seem a hassle for a moment, however it is valuable in the long run.
Once the checking is complete and minor issues are solved, your engineer should provide you with a detailed report. It will be kept as a track record. Even if a new engineer checks the boiler next year, he will be able to solve issues by analysing this previous report.
What are the major signs that indicate urgency for a boiler service? We’ll let you know thoroughly. If you maintain your boiler with annual servicing and address minor issues before it’s too late, it may last up to 15 years or more. However, you must know the signs when your boiler needs immediate attention and service. Maybe it’s already showing signs, and you skipped! The common signs are-
The pilot light is the ignition source that heats up water. Check your boiler’s front panel, which is a small access(a door or a window), to check if the pilot light is lit. It should be steady, and the flame must be bright blue. If you see a yellow flame or if it’s flickering, you need to call an engineer. That can be a sign of a carbon monoxide leak. If it’s lighting up and turning off frequently, call your engineer and stay away from home until the engineer comes.
Suppose your boiler is running and your rooms are still cold, which means it’s not working properly. The first thing you can do is check if the radiators are working. If they are running well, you must contact professionals to check your boiler and address the issue.
If you find an unpleasant odour near your boiler, it might hint that the gas is leaking. Look for dark stains in the casing. Sometimes, when gas leaks, a dark stain is seen in the boiler casing. If gas is leaking, call a gas engineer right away and stay alert.
A running boiler typically makes a mild noise that blends in the background and fades. But if the noise is louder, it indicates a problem in the boiler. Contact your engineer and book your boiler service if the sound continues.
You should service your boiler once a year. It’s a priority, especially as winter approaches. If it’s been a year since you last serviced your boiler, it’s time for another service.
To determine the best engineer or service quote for your boiler, you should know what to ask them and what not to. It’s obvious you would ask: What does a boiler service include, according to their quote? However, there are other essential questions you should ask your engineer before they start the project. Here are the questions you may ask-
How long your boiler service will take depends on how many checks and repairs need to be done and on your boiler’s model. However, a typical boiler service may take 30 minutes to a few hours. In most cases it takes 30 minutes to 1.5 hour.
Checking is not the only thing that takes time. If your engineer finds issues that need to be dealt with right away, a boiler service can take more time.
A boiler service cost depends on many factors such as boiler type, fuel type, location, boiler’s model and brand, etc. However, a boiler service costs £100 on average. If covered by insurance, a boiler cover ranges from £8 to £13 per month. Here’s an approximate range of boiler service costs and boiler cover costs according to CheckaTrade:
Service Cost:
| Type of Boiler | Unit | Cost+VAT | Average Cost |
| Gas Boiler | One-off service cost | £80-£120 | £100 |
| Oil Boiler | One-off service cost | £75-£110 | £92.50 |
| Electric Combi Boiler | One-off service cost | £70-£110 | £90 |
Cover Cost:
| Type of Cover | Unit | Cost+VAT | Average Cost |
| Monthly Boiler Cover Cost | Monthly Fee | £8-£13 | £10.50 |
| Boiler and Central Heating Cover | Annual Fee | £180-£300 | £240 |
For instance, boiler service might seem like a waste of money. However, it is more than worth it in the long run. Always remember to ask your engineer what does a boiler service include in their quote. Considering the installation and replacement costs, annual boiler service is the wisest thing for UK homes.
As a heating service that runs on a gas boiler, the costs are way lower than other alternatives. An annual boiler service is nearly mandatory. Count on it and you’ll forget to regret.
A boiler service usually doesn’t include checking radiators. Engineers don’t check radiator’s functionality or power flush while checking. However, if any problem detects, they might solve it to run the boiler efficiently.
A boiler should be serviced once annually. It doesn’t require frequent servicing. However, if you don’t service your boiler annually, it may cause expensive breakdowns, and frequent servicing may be required.
A standard boiler service typically lasts 30 minutes to 1.5 hours, and it may take longer if any problems are detected and need to be addressed.
If maintained properly with annual boiler service, a boiler lasts around 15-20 years. Low maintenance can reduce the lifespan.
If you don’t service your boiler annually, it may cause excessive electric bills, improper heating, loud noises, gas leaks, expensive breakdowns, etc.
Boiler trouble usually shows up as poor heating, a strong odor, pilot-light issues, loud noises, and a yellow flame on the pilot. If you spot any of these signs, contact a professional.
No, home insurance doesn’t include boiler service. You need a separate policy for boiler cover. Sometimes, boiler services are insured, or you can ask for coverage.
SBB Plumbing offers expert plumbing services, including bathrooms, heating, air conditioning, and home cover plans.
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