Gas Safe registered boiler repair engineers across London. Post a job free and get contacted within hours.
Gas Safe engineers diagnose your boiler fault and provide a written quote before any repair work begins. Most faults identified on the first visit.
Find an engineer →Rapid response for total loss of heating or hot water. Common causes: diverter valve, pump failure, PCB fault — all diagnosed and repaired by Gas Safe engineers.
Find an engineer →Boiler showing error codes and refusing to fire? Gas Safe engineers diagnose and reset lockout faults for all major brands including Worcester, Vaillant, and Ideal.
Find an engineer →Low or high boiler pressure resolved by Gas Safe engineers. Common causes include water leaks, faulty expansion vessels, and pressure relief valve failure.
Find an engineer →Pilot light going out is usually a thermocouple fault or gas supply issue. Always attended by a Gas Safe registered engineer.
Find an engineer →All major boiler brands — Worcester Bosch, Vaillant, Ideal, Baxi, Viessmann — diagnosed from manufacturer error codes by experienced Gas Safe engineers.
Find an engineer →| Job | Low estimate | High estimate |
|---|---|---|
| Fault diagnosis | £80 | £150 |
| Labour (per hour) | £60 | £120 |
| Boiler repair (minor) | £150 | £250 |
| Boiler repair (major) | £250 | £400 |
| Part replacement (varies by part) | £50 | £300 |
| Emergency call-out | £150 | £300 |
Prices are estimates for London 2026. Parts cost extra and vary by make and model. Always get a written quote before work begins.
Describe the boiler fault and your London postcode. Note the error code if displayed. Under 2 minutes — no registration required.
Gas Safe registered engineers covering your area respond directly. They may ask for more details about the fault before attending.
Review each engineer's Gas Safe number, experience, and quoted price. No obligation to hire — you choose.
London's most popular boiler brands — Worcester Bosch, Vaillant, Ideal, and Baxi — all have strong engineer networks across the capital. However, the single biggest driver of boiler repair demand in London is not brand failure but water quality. Thames Water supplies all of Greater London with exceptionally hard water, and the resulting limescale build-up inside boilers is a primary cause of heat exchanger damage, efficiency loss, and premature failure. A boiler that "kettles" (produces banging or rumbling sounds during operation) is almost certainly suffering from limescale accumulation. Annual servicing with a magnetic boiler filter dramatically reduces this risk.
When deciding whether to repair or replace a boiler in London, the key factors are age, repair cost, and energy efficiency. A new A-rated condensing boiler running at 90%+ efficiency will save significantly on energy bills compared to an older non-condensing unit operating at 70–75%. The general rule is: if the boiler is over 10 years old and the repair cost exceeds 50% of the price of a comparable new boiler, replacement is almost always the better long-term choice. A Gas Safe engineer will give you an honest assessment after diagnosis.
Free to post. No subscription. Gas Safe registered engineers across all London boroughs — usually responding within hours.