A Complete Guide to Gas Boiler Services (2024)

Different providers offer different types of boiler service. But a good engineer will really get under the hood of your boiler to check how it’s working.

You’ll need to be at home, so that you can show them where the boiler is and the location of anything else they might want to inspect. Most services then follow a similar checklist approach[2]. For instance, a visual examination of how the boiler has been installed, that it’s still functioning correctly, and any signs of damage or corrosion. The engineer will also check for water leaks. (If your boiler’s leaking water,read this blogto find out what could be causing it.)

Also, expect the engineer to check the controls, the electrics and if the boiler is vented correctly. They’ll remove the boiler casing to look inside the boiler – and check all the components are working as they should. And they’ll likely carry out some sort of maintenance. For instance, removing any dirt or debris around the fan assembly. Checking the connections on the heat exchanger. And making sure all combustion seals are intact – this is a really important safety measure.

An engineer will check the boiler is working correctly. For instance, that the pilot light is on and glowing blue (ayellow, orange red, purple or green flameindicates a problem). They’ll also check your boiler’s at the right gas pressure. Not sure what the correct boiler pressure is?Read this blog.

What’s a gas safety check?

During a gas safety check, an engineer checks all the gas appliances in your home – including your boiler – to make sure they’re operating safely. The clue’s in the name: the focus is on safety[3]. During a boiler service, the engineer will check your boiler and related parts – like the flue – are operating safely. But they’ll also inspect the boiler parts for wear and tear too, and make sure everything’s functioning correctly.

And they’ll probably carry out various tests too. For instance, checking the performance of the flue. And taking carbon monoxide and carbon dioxide readings from the boiler.

What isn’t included in a gas boiler service?

Generally you have to pay extra for any repairs that need doing as part of the service – along with the new parts and labour cost to install them. You’ll pay extra for any new appliances too – such as a new carbon monoxide detector. And obviously should your boiler be dangerous or too faulty to fix, you’ll need to pay for aboiler replacement.

Also, be aware that some providers might charge a cancellation fee if you cancel at very short notice. If you’re unsure, ask the company arranging the service for a breakdown of exactly what is and isn’t included in the boiler service.

A Complete Guide to Gas Boiler Services (2024)

FAQs

What maintenance does a gas boiler need? ›

Annual Maintenance

Hydro test boiler for leaks (tube joints and piping). Inspect all refractory for fallen broken chunks. Check gas regulator pressure settings. Replace or re-certify safety valves.

How do you service a boiler step by step? ›

Check that any ventilation requirements for the boiler have been met. Check the boiler flue throughout its length, including its point of termination. Carry out flue-flow & spillage tests (smoke tests) if the boiler is of an open-flued type. Check that any boiler safety devices operate correctly.

How often does a gas boiler need to be serviced? ›

Boilers should be serviced once a year, especially if they are gas or oil. This annual service is an opportunity for a qualified heating engineer to look over the unit and make sure it's running as well as possible for you. This will give you the peace of mind that your heating system is running safely and efficiently.

How long does a full boiler service take? ›

Boiler services take 30-minutes to 1 hour for most gas boilers. Newer boilers can be serviced in just 30-minutes. Gas boilers take a little longer to service, around 1 hour to 2 hours. Servicing is well worth it in the long run as it helps boilers run smoothly and safely.

What is checked on a gas boiler service? ›

During a boiler service, after an initial visual inspection to ensure everything looks in order, the engineer will check inside your boiler and related parts, including: Flue integrity and gas pressure will be checked.

What is the average life of a gas boiler? ›

On average, a conventional gas boiler can last for 10 to 15 years given that it is well maintained and serviced annually. If you have a superior quality boiler and it's well maintained, you can expect it to last for 20 years and more. Boilers differ in terms of quality and longevity.

How many years should a gas boiler last? ›

What Is The Average Lifespan Of A Boiler? The average lifespan of a central heating system is around 15 years, but it all depends on how well it's looked after. You can help your boiler last longer by keeping it regularly serviced and well maintained, so these short-term costs can help you enjoy long-term gains.

Does a boiler service include a system flush? ›

Ensures maximum boiler efficiency

A Gas Safe registered heating engineer can detect any build-up in the central heating system and perform a system flush when required to keep your boiler working in tip-top condition.

Does a boiler service include a flush? ›

Does a boiler service include a system flush? Yes, a boiler service can include a central heating system flush if requested or the heating engineer detects build-up in the central heating system. Regular flushes can help keep your boiler working properly.

What is a boiler service plan? ›

An annual boiler service plan is a great option for spreading the cost of your boiler's service throughout the year rather than having to pay for it all at once, whilst also giving you peace of mind that your boiler's service is covered without you needing to do anything.

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