Boiler Service: What It Is, How Much, and How Often You Need It

If your home feels chilly or your radiators make weird noises, a boiler service could be the fix you need. A proper service is more than a quick check‑up – it’s a thorough clean, safety test, and performance tune‑up that keeps your heating reliable and your energy bills in check.

Most UK heating engineers follow the same basic checklist. They’ll:

• Inspect the gas valve, flame, and heat exchanger for leaks or cracks.
• Clean the burner and combustion chamber to improve efficiency.
• Check the pressure, water level, and circulation pump.
• Test safety devices like the pressure relief valve and carbon monoxide detector.
• Flue inspection to make sure exhaust gases are venting safely.

When everything checks out, you get a service certificate – proof that the boiler meets legal safety standards.

How Often Should You Book a Service?

Most manufacturers and insurers recommend an annual service. If you have a newer condensing boiler, you might stretch it to 18 months, but older models really benefit from a yearly tune‑up. Think of it like a car’s MOT: regular checks catch small problems before they become costly breakdowns.

Key signs you need a service sooner include:

• Unexplained spikes in your heating bill.
• Knocking or whistling noises from the boiler.
• Water leaking around the unit.
• Warm water taking longer than usual to reach the taps.
• Any odd smells, especially a gas odor.

Spotting these early and calling a pro can save you from a full‑scale replacement.

What Does a Boiler Service Cost in 2025?

Prices vary by region and boiler type, but you can expect to pay between £80 and £150 for a standard annual service. Complex systems like combi or oil‑fed boilers may sit at the higher end of that range. Some companies bundle a service with a yearly maintenance contract, which includes priority call‑outs and discounted repairs – this can be a smart choice if you want peace of mind.

When you get a quote, ask what’s included. A good service will list each test, the time spent, and any parts that were replaced. Avoid firms that only quote a flat rate without detailing the work – hidden fees can add up quickly.

Choosing the right engineer matters. Look for Gas Safe registration, positive customer reviews, and clear communication about what they’ll do on the day. A reputable technician will explain any findings in plain language and give you options rather than pushing an unnecessary replacement.

To keep your boiler humming:

• Schedule your service before the heating season starts.
• Bleed radiators regularly to improve water flow.
• Check the pressure gauge weekly; aim for 1–1.5 bar when the system is cold.
• Don’t ignore minor leaks – they often signal bigger issues.

Remember, a well‑maintained boiler not only lasts longer but also runs more efficiently, saving you money and reducing carbon emissions.

So, if it’s been a year (or more) since your last check, give a qualified local service a call. A quick appointment now can keep you warm all winter without the surprise of a broken boiler in the middle of a cold snap.