Post your boiler repair job free and Gas Safe registered engineers in your area will respond directly — servicing, repairs, and full replacements across London.
Gas Safe registered only · Boiler service · Fault diagnosis · Boiler replacement · Power flush · All London postcodes
It is illegal for anyone who is not Gas Safe registered to work on a gas boiler or gas appliance in the UK. Always ask to see the engineer's Gas Safe ID card before work begins, and verify their registration at gassaferegister.co.uk. Every engineer on GetQuickHelp is Gas Safe registered.
Annual service covering heat exchanger inspection, flue gas analysis, safety device testing, and internal cleaning to maintain efficiency and warranty.
Engineer reads error codes, tests components, and identifies the exact cause of the fault before quoting for parts and repair.
Identify and fix the cause of repeated pressure loss — typically a small leak in the system, a faulty pressure relief valve, or a leaking filling loop.
Diagnose and repair diverter valve, plate heat exchanger, or thermistor faults that leave a combi boiler producing heat but no domestic hot water.
Remove the old boiler and install a new Gas Safe certified combi boiler, including new controls, thermostat, and commissioning.
Pump chemical cleaner through the heating system to remove sludge and magnetite from radiators and the heat exchanger — restores efficiency and protects the new boiler.
| Job | Low estimate | High estimate |
|---|---|---|
| Boiler service | £80 | £150 |
| Gas Safe engineer call-out (daytime) | £50 | £100 |
| Boiler repair (parts + labour) | £150 | £400 |
| Emergency boiler call-out (out of hours) | £150 | £300 |
| Boiler replacement (combi) | £1,800 | £3,500 |
| Power flush (central heating system) | £400 | £800 |
| Magnetic filter installation | £100 | £200 |
| Gas Safety Check (CP12) | £70 | £130 |
Prices are estimates for London 2026. Actual costs depend on fault, boiler make, and parts availability. Always get a written quote before work starts.
Describe the boiler fault, include the make and any error codes if visible, and enter your postcode. Takes under 2 minutes.
Gas Safe registered boiler engineers in your area see your job and message you with their availability and price. No middlemen.
Review responses, check Gas Safe IDs, and hire the engineer that suits your timing and budget. You stay in control.
Boiler repairs in London typically cost £150–£400 including parts and labour for common faults such as a faulty diverter valve, broken pump, or pressure relief valve. A Gas Safe engineer call-out costs £50–£100 during the day or £150–£300 out of hours. A boiler service costs £80–£150. A full combi boiler replacement costs £1,800–£3,500. A power flush to clear sludge from the heating system costs £400–£800. Always get a written quote before the engineer starts any repair work.
Repair is usually the right choice if your boiler is under 10 years old and the repair cost is less than a third of the cost of a new boiler. If your boiler is over 12–15 years old, repeatedly breaking down, or if the repair cost is significant, replacement is often more cost-effective in the long run. A new A-rated combi boiler can reduce heating bills noticeably compared to an old inefficient boiler. A Gas Safe engineer can give you an honest assessment once they have diagnosed the fault.
Most common boiler repairs take 1–3 hours if the engineer has the required part available. Faults requiring parts to be ordered may take 1–2 additional days. A boiler service takes around 1 hour. A full boiler replacement typically takes 1–2 days depending on the system type and any modifications needed to the pipework or flue.
Yes — it is a legal requirement in the UK. It is illegal for anyone who is not Gas Safe registered to carry out work on gas appliances, including boilers, gas fires, and gas cookers. Working with gas without registration is dangerous and can result in carbon monoxide poisoning, explosions, or fires. You can verify any engineer's Gas Safe registration at gassaferegister.co.uk or by checking the card they carry. Post your job on GetQuickHelp and only Gas Safe registered engineers will be able to respond.
The most common boiler faults in London include: loss of pressure (usually a small leak or a faulty pressure relief valve), no hot water while heating works (usually a faulty diverter valve in a combi boiler), no heating while hot water works (faulty zone valve or motorised valve), banging or kettling noises (limescale or sludge build-up in the heat exchanger), boiler lockout with error codes (check the manual — often a sensor or ignition issue), and pilot light or ignition failure. Hard Thames Water accelerates limescale problems in London boilers more than in soft water areas.
Click 'Post a Job — It's Free', describe the boiler fault (including the make, model, and any error codes if you can see them), and enter your London postcode. Gas Safe registered boiler engineers in your area will contact you directly with their availability and price. There is no subscription, no call-out fee to post, and nothing to pay until you hire an engineer. You stay in control and choose who to hire.
Post your job free and Gas Safe registered boiler engineers in your area will contact you directly — no subscription, no call centre fees.