How Much Does It Cost to Repair a Boiler?
£100 – £500
per job
Boiler repair costs range from £100 to £500 depending on the fault, the age of the boiler, and whether parts need to be ordered. Common repairs include replacing a faulty diverter valve, a worn pump, or a failed printed circuit board. A Gas Safe registered engineer must carry out all boiler repairs - it is a legal requirement in the UK.
Average cost
£100 – £500
per job
Prices vary by region, property type and tradesperson. Always get at least two quotes.
What affects the price?
Type of fault - a simple thermocouple or pressure issue costs £100-£150 to fix; a PCB or heat exchanger replacement costs £300-£500+
Parts availability - common parts are often on the van; obscure parts for older boilers may need ordering, adding time and cost
Boiler age and brand - parts for boilers over 10 years old may be hard to source and priced at a premium
Diagnosis time - intermittent faults can take an engineer an hour or more to diagnose before any repair begins
Labour vs materials
Gas engineers typically charge a call-out fee of £60-£100 plus £60-£90 per hour. Parts are usually charged at trade price plus a markup of 20-40%.
Repair or replace?
If the boiler is over 10-12 years old and the repair cost exceeds £400, or if you have had multiple repairs in the past two years, a new boiler is likely more cost-effective. A new combi boiler costs £1,800-£3,800 installed.
Questions to ask your tradesperson
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