How often should a boiler be serviced?
Most boiler makers advise a service once a year. Some warranties ask for it too, so check your paperwork. Servicing also helps because it finds small faults early. Regular servicing helps your boiler run safely and keeps small faults from growing.
If you rent your home, your landlord must arrange a gas safety check every 12 months. This is a safety check, not a full service. However, the engineer may offer both at once.
What happens during a gas boiler service
The engineer looks at the boiler casing, the flue and the controls, because each part affects safety. They check that the boiler lights and burns properly. They also inspect the pipes, seals and safety devices.
Usually they remove the cover and clean key parts, because dirt can stop the boiler working well. They may measure the gases leaving the flue, since this shows how well the boiler burns fuel. Afterwards they refit the cover and test the boiler again.
You do not need to do much beforehand, although clear space helps. Clear space around the boiler and make sure the engineer can reach it. Put any pets in another room.
What findings indicate a problem
Some signs show a boiler needs more than a clean, for example a leak or a damaged flue. Examples include a flame that looks wrong, leaks, rust and a flue that is damaged. A pressure that keeps dropping is another sign.
The engineer should explain each fault in plain words. Ask what is urgent and what can wait. If a boiler is unsafe, the engineer may turn it off until it is repaired.
Finding a Gas Safe registered engineer
By law, anyone who works on gas appliances must be on the Gas Safe Register. Ask to see the engineer’s ID card and check what work it covers. You can also check the register online.
Do not accept a service from someone who cannot show this. Unsafe gas work can lead to gas leaks and carbon monoxide. Fit a carbon monoxide alarm as well, because it warns you if something goes wrong.
Servicing costs
Prices vary with the boiler type, the engineer and where you live, so compare quotes. Ask for the price before you book, and ask what it includes. A clear quote should list the checks and any extra charges.
Be wary of very low prices. A service that is too quick may skip important checks. Compare two or three quotes and ask each firm what the visit covers.
Related guides and local help
If you want to know more, read Central Heating Not Working? A Full Step-by-Step Guide. You can also read Boiler Pressure: Normal Range, Low Fixes and High Pressure and How to Bleed a Radiator: A Simple Step-by-Step UK Guide, because they cover closely related problems.
These guides help too: When to Replace Drain Pipes: Signs, Lifespan and What to Do, How to Drain and Flush a Central Heating System at Home, Victorian and Edwardian Drainage: Common Problems to Expect, New Boiler Guide: How to Choose the Right Boiler for You and UK Property Drainage History: How Home Age Affects Risk. Each one explains a related topic in plain English.
Need help near you? Read our powerflush page first, or see Powerflush in Andover and Powerflush in Annesley. You can also see Plumbing Repairs in Buxton, since every service page has a free quote form. We pass each request to a local drainage engineer.
