You won't smell it. You won't see it. But if carbon monoxide starts leaking from your boiler, the consequences could be fatal. Catching problems before they start through a boiler service in London is the only real protection. Without this inspection, you're running your boiler on trust alone, and that's not good enough, especially in winter when your system is running daily and under pressure.

What exactly is a boiler service in London?

A boiler service is a scheduled inspection (usually done once a year) where a qualified Gas Safe engineer checks whether your boiler still runs safely and efficiently. If something's failing, they'll catch it before it becomes a serious fault.

You're probably required to book this annually if your boiler is still under warranty. But even if you're out of warranty, the risk of skipping it isn't worth saving a few pounds.

What does a boiler service in London actually check?

  • They open the boiler and check for damage such as cracks, rust, loose seals, or anything that might let gas or fumes escape.
  • They inspect the flue and ventilation. If exhaust gases aren't venting properly, carbon monoxide can leak back inside.
  • They test the burner and combustion levels. This shows whether the boiler's burning fuel cleanly or producing dangerous by-products.
  • They look for signs of leaks or corrosion, such as dripping valves, watermarks on the casing, or heat marks, which can all point to bigger problems.
  • They clean filters and flush out any buildup. Blockages strain the system and can trigger malfunctions.
  • They check control settings and safety cut-offs. Your boiler should shut itself down if something goes wrong, and that only works if the safety systems are functioning.

At the end, you get documentation confirming the boiler's been serviced. More importantly, you get a verdict: safe or not safe.

Never let anyone touch your boiler unless they're Gas Safe.

Only Gas Safe Registered engineers are legally allowed to work on gas boilers (including routine services). No matter how handy your plumber, your electrician, or your mate who "knows about boilers" might seem, if they're not on the Gas Safe Register, they shouldn't be doing the work — no exceptions. Bad repairs and dodgy servicing are one of the top causes of carbon monoxide poisoning in UK homes, so don't take your chances.

The Gas Safe Register lists engineers who've trained for this exact work and know what to look for. You can search the register online or ask the engineer to show their ID on arrival.

At WPJ Heating, every engineer is Gas Safe Registered, so you can be confident that they'll do the job properly. Call 020 4572 5314 or book a boiler service in London online using their website.

About the Author:

In 2002, Will Hawksley and PJ Luard established WPJ Heating with the ambition of attaining the foremost position among heating companies in London. The two individuals deliberated on the complexities of plumbing and boilers before deciding to collaborate. At present, WPJ Heating has expanded its staff to 26 members. Their cadre of skilled professionals encompasses gas engineers, plumbers, a specialised team for drainage and pressure jetting, versatile bathroom fitters, electricians, and decorators.