Boiler repair cost: common faults and typical 2026 prices
Boiler repair cost depends heavily on which part has failed, since a call-out for a sticking diverter valve and a call-out for a cracked heat exchanger are very different jobs even though both might show up as a lost heating error. A diagnosis on site is usually needed before a firm repair price can be given.
Understanding a boiler repair before you spend money
In 2026, a call-out and diagnosis typically costs £70 to £100, often credited against the repair if you go ahead. Common repairs such as replacing a diverter valve, PCB, pump or expansion vessel generally run £150 to £320 including parts and labour, while a full heat exchanger replacement, where the boiler's age and part availability allow it, can run £350 to £550 or more. On older boilers, particularly those over 12 to 15 years old, parts can be harder to source and sometimes cost more relative to the value of the appliance, which is when repair versus replacement genuinely needs weighing up rather than assumed.
Detail that affects your quote for a boiler repair
- Call-out and diagnosis typically costs £70 to £100, often credited if repair proceeds
- Common part replacements (valves, pumps, PCBs) generally run £150 to £320 fitted
- Heat exchanger replacement can run £350 to £550 or more depending on the model
- Parts for boilers over 12 to 15 years old can be slower or costlier to source
- A firm repair price normally needs an on-site diagnosis rather than a phone estimate
Where we deal with this
Published business details
- Based at 24 Bristol Road, Radstock, BA3 3EE
- Telephone enquiries: 07516 118198
- Opening hours: Monday to Friday, 8:30am to 5:00pm
Need help with a boiler repair?
Our advice: Most boiler repairs in 2026 fall between £150 and £550 depending on the part involved, with a proper on-site diagnosis needed before a firm figure can be confirmed.
Use the enquiry form to describe the appliance, fault code and what changed before the problem started.
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Services that cover this
Questions we get asked
- Can you quote a repair price over the phone?
- Only roughly. A fault code or symptom can narrow down likely causes, but a firm price needs the boiler checked on site.
- Is it ever worth repairing a very old boiler?
- Sometimes, if the fault is minor and cheap to fix, but persistent or expensive faults on an older appliance are worth weighing against replacement cost.
- Do you charge extra for emergency call-outs?
- Call-out pricing depends on timing and urgency, so it's worth asking when you book rather than assuming a flat rate applies.
- What if the same fault happens again shortly after a repair?
- Reputable repairs are usually covered by a short workmanship guarantee on the part fitted, so it's worth checking terms before paying.
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