Boiler repair vs replacement cost in the UK
A boiler repair in the UK typically costs £150–£500, while a full replacement ranges from £1,800 to £4,500 including the boiler, flue, filter, labour and commissioning. If your boiler is under 8 years old and the fault is minor, repair usually makes sense. Over 12 years old, replacement is often more economical.
Homeowners researching this typically also price up boiler installation cost in the uk, boiler replacement cost in the uk and combi boiler installation cost in the uk. For wider context, browse our bathroom pricing, kitchen pricing and trades day rates.
Cost table
| Item | Typical range (GBP) |
|---|---|
Minor repair (valve, sensor, ignition) | £150–£350 |
Major repair (pump, PCB, heat exchanger) | £350–£700 |
Annual service | £80–£150 |
Budget boiler replacement (24–30 kW) | £1,800–£2,800 |
Mid-range boiler replacement (30–35 kW) | £2,500–£3,800 |
Premium boiler replacement (system / combi) | £3,500–£5,500 |
Labour costs
Labour for a replacement is £600–£1,200 (1–2 days). Repair labour is £80–£120 for the first hour, then £60–£90/hour.
| Item | Typical range (GBP) |
|---|---|
Repair call-out + first hour | £80–£120 |
Additional repair labour (per hour) | £60–£90 |
Boiler replacement labour | £600–£1,200 |
Powerflush (recommended with new boiler) | £300–£500 |
Magnetic filter install | £150–£300 |
Materials costs
Parts for repairs vary from £30 sensors to £600 heat exchangers. Replacement boilers range from £700 budget models to £2,500 premium system boilers.
| Item | Typical range (GBP) |
|---|---|
Budget combi boiler | £700–£1,100 |
Mid-range combi boiler | £1,000–£1,800 |
Premium / system boiler | £1,500–£2,500 |
Flue kit & accessories | £150–£400 |
Magnetic filter | £80–£200 |
Repair parts (sensor, valve, pump) | £30–£400 |
Factors affecting cost in the UK
- ·Boiler age — under 8 years, repair; over 12 years, replace.
- ·Efficiency — old non-condensing boilers are 60–70% efficient; new A-rated models are 90–94%.
- ·Parts availability — discontinued models make repairs expensive or impossible.
- ·Warranty — new boilers carry 5–10 year warranties; repairs only guarantee the part.
- ·Gas Safe registration — only Gas Safe engineers can legally work on gas boilers.
Ways to reduce cost
- ·Get a fixed-price repair quote, not an open-ended hourly rate.
- ·Check if the boiler is under manufacturer warranty before paying for parts.
- ·Compare repair cost against 2–3 years of expected remaining life.
- ·Choose a boiler with a 7–10 year warranty for long-term peace of mind.
- ·Combine replacement with a system powerflush and new controls for efficiency.
Frequently asked questions
- When is it not worth repairing a boiler?
- If the boiler is over 12 years old, parts are obsolete, or the repair exceeds 50% of replacement cost. Repeated breakdowns also signal replacement time.
- How much does a new boiler save on bills?
- Replacing a G-rated non-condensing boiler with an A-rated model can save £200–£400 per year on gas bills for a 3-bed semi.
- Do I need a powerflush with a new boiler?
- Most manufacturers require it for warranty validity. It costs £300–£500 but protects the new heat exchanger from sludge damage.
- Can any plumber replace a boiler?
- No. Only Gas Safe registered engineers can work on gas boilers. Always ask to see their Gas Safe card.
- How long does a boiler replacement take?
- A straight swap takes 1 day. Moving the boiler, changing from system to combi, or upgrading pipework extends to 2–3 days.