Boiler Repair Cost (2026 UK Guide)
Boiler repair costs in the UK typically range from £120 to £1,200+, depending on the type of boiler, the nature of the fault, and whether emergency repairs are required. Minor issues such as pressure faults are usually inexpensive to fix, while major component failures or repeated breakdowns can be far more costly.
This guide explains average boiler repair costs in 2026, common boiler problems, and when professional repairs or replacement may be required.
Average Boiler Repair Cost
| Boiler Issue | Typical Repair Required | Average Cost |
|---|---|---|
| Low boiler pressure | Repressurising or valve repair | £120–£200 |
| Boiler not heating | Thermostat or sensor repair | £150–£350 |
| Boiler leaking | Seal or component repair | £180–£500 |
| Faulty pump | Pump replacement | £250–£600 |
| Heat exchanger fault | Major component repair | £400–£1,200+ |
| Emergency boiler repair | Urgent call-out | £200–£500+ |
Costs increase for emergency call-outs, older boilers, and complex internal faults.
For a full overview of plumbing prices, see our plumbing repair cost guide.
Common Boiler Problems Explained
🔥 Low Boiler Pressure
Often caused by leaks, bleeding radiators, or faulty pressure valves.
🔥 Boiler Not Producing Heat
Usually linked to thermostat faults, sensor issues, or circulation problems.
🔥 Boiler Leaking
Leaks may occur due to worn seals, corrosion, or internal component failure.
🔥 Strange Noises
Banging or gurgling sounds (often called “kettling”) may indicate limescale build-up or pump issues.
What Affects Boiler Repair Costs?
Type of Boiler
Combi, system, and conventional boilers vary in complexity and repair cost.
Age of the Boiler
Older boilers may be more expensive to repair due to part availability.
Severity of the Fault
Minor faults cost far less than major internal component failures.
Emergency Repairs
Out-of-hours boiler repairs increase total costs.
Boiler Repair vs Boiler Replacement
Repair Is Usually Suitable When:
- The boiler is under 10 years old
- Faults are isolated
- Repair costs are reasonable
Replacement May Be Better When:
- Repairs are frequent
- Major components fail
- Repair costs approach replacement cost
A professional engineer can advise on the most cost-effective option.
Boiler Repairs and Water Damage
Leaking boilers can cause water damage to:
- Floors
- Walls
- Nearby electrical components
If damage has occurred, you may also need to review:
When Is a Boiler Repair an Emergency?
A boiler repair may be considered an emergency if:
- There is no heating or hot water
- Leaks are causing flooding
- The boiler shuts down repeatedly
- There is a safety concern
Emergency boiler repairs usually cost more due to urgency.
For emergency pricing, see our emergency plumber call-out cost guide.
Can You Repair a Boiler Yourself?
⚠️ Boiler repairs should never be attempted by homeowners.
Only qualified professionals should carry out boiler repairs due to:
- Gas safety regulations
- Risk of carbon monoxide
- Electrical hazards
DIY boiler repairs are unsafe and illegal in many cases.
How Long Does Boiler Repair Take?
- Minor repairs: 1–2 hours
- Component replacement: 2–4 hours
- Major faults: May require multiple visits
Time depends on fault severity and part availability.
Does Home Insurance Cover Boiler Repairs?
Insurance may cover boiler repairs if damage is caused by a sudden fault, such as:
- Component failure
- Accidental damage
Wear and tear and servicing issues are usually excluded.
How to Reduce Boiler Repair Costs
- Service your boiler annually
- Address pressure issues early
- Bleed radiators regularly
- Replace ageing boilers before major failure
Preventative maintenance reduces repair costs significantly.
Final Thoughts
Boiler repair costs vary widely depending on the type of fault and how quickly it is addressed. Prompt professional repairs help restore heating safely and prevent further damage or breakdowns.