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Boiler service in London

A real annual boiler service, with flue gas analysis, burner inspection and pressure and safety checks, takes about an hour and catches faults early.

If you smell gas, or a carbon monoxide alarm sounds: don't smoke, light a flame or touch light switches, open the doors and windows, turn the gas off at the meter if you can reach it safely and it isn't in a cellar or basement, get everyone out, and call the National Gas Emergency Service free on 0800 111 999 before anything else — before calling us.

Request a verified professionalTypical London price: £90–£120 per service

Sound familiar?

  • It's been more than 12 months since the last service
  • Warranty requires annual servicing to stay valid
  • Yellow or orange flames instead of blue, or soot or staining on or around the boiler. HSE says these can mean it is producing carbon monoxide: turn the boiler off and don't use it until it has been checked. If you think it is leaking carbon monoxide, open the doors and windows, get everyone out and call the National Gas Emergency Service free on 0800 111 999. If anyone feels unwell, call NHS 111 urgently, or 999 if anyone is struggling to breathe, confused, unconscious, weak or has chest or muscle pain; don't drive yourself to A&E.
  • Boiler working but less efficient than it was

Radiators cold at the bottom? Causes and what to do — the likely causes, what you can check yourself, and what to leave alone.

What your Hero will do

  1. 1Analyse flue gases and combustion performance
  2. 2Inspect the burner, heat exchanger and seals
  3. 3Check gas pressure, safety devices and the condensate route
  4. 4Issue a service record you keep on your job timeline

When to call

Book in summer or early autumn — availability is better and any fault found can be fixed before the heating season. If you smell gas, or a carbon monoxide alarm sounds: don't smoke, light a flame or touch light switches, open the doors and windows, turn the gas off at the meter if you can reach it safely and it isn't in a cellar or basement, get everyone out, and call the National Gas Emergency Service free on 0800 111 999 before anything else — before calling us.

Common questions

How often should a boiler be serviced?
At least once a year. HSE strongly advises having gas appliances, flues and pipework serviced at least annually by a Gas Safe registered engineer. If you own and live in the home, no law sets a schedule; if you let it, the landlord must have each gas appliance and flue they supply safety-checked at least every 12 months, which is a different check from a service. Your boiler's warranty may also require a yearly service, so check its terms.
What's the difference between a service and a safety check?
A landlord gas safety check (CP12) confirms appliances are safe; a service goes further — cleaning, combustion analysis and preventative checks. Landlords usually book both together in one visit.

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