Replace or Repair? Boiler Replacement Cost vs Repair Cost
A faulty boiler can quickly turn from a mild inconvenience into a stressful, expensive problem — especially during…
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At a glance
A faulty boiler can quickly turn from a mild inconvenience into a stressful, expensive problem — especially during the colder months in Sevenoaks or Tunbridge Wells. But before you commit to a costly new installation, it’s worth asking: is it better to repair or replace your boiler?
In this guide, we’ll help you understand boiler repair costs vs replacement costs, what factors affect each, and how to decide what’s most cost-effective in the long run.
Typical Boiler Repair Costs in the UK
The average boiler repair cost in the UK typically ranges between £100 and £500, depending on the issue and parts required. However, more serious faults can cost upwards of £1,000, especially for older boilers with limited spare parts.
Common Boiler Problem | Average Repair Cost (UK) |
Minor leak or pressure fix | £100 – £200 |
Faulty thermostat | £80 – £150 |
Broken fan or pump | £200 – £350 |
Heat exchanger replacement | £400 – £800 |
Control board (PCB) issue | £300 – £600 |
While repairs are often cheaper upfront, frequent callouts or major component failures can quickly add up. If your repair costs exceed half the price of a new boiler, replacement is usually the smarter option.
Which fuel powers your boiler?
Mains Gas
LPG
It just takes 60 Seconds
And then you can book a free consultation
Boiler Replacement Costs in Sevenoaks
For homeowners in Sevenoaks and nearby areas, the average boiler replacement cost typically falls between £2,000 and £4,500, depending on the system type, brand, and installation requirements.
Boiler Type | Average Cost (Including Installation) |
Combi Boiler | £2,000 – £3,200 |
System Boiler | £2,300 – £3,800 |
Regular Boiler | £2,500 – £4,500 |
If you’re replacing an old combi boiler with a new, energy-efficient model, Kentish Plumbers can often complete the installation within a single day, minimising disruption and restoring comfort to your home quickly.
When Is Repair the Right Choice?
Repairing your existing boiler might be the best choice if:
- The boiler is under 8 years old and has been regularly serviced.
- The issue is minor, such as a faulty sensor, valve, or thermostat.
- You have a valid manufacturer’s warranty that covers parts or labour.
- The system is otherwise reliable and energy-efficient.
In these cases, a simple repair could extend your boiler’s life by several years without major expense.
When Is Replacement the Smarter Option?
In contrast, replacement is often the most cost-effective decision when your boiler:
- Is 10–15 years old or older.
- Has frequent or recurring breakdowns.
- Is inefficient and drives up energy bills.
- Uses outdated or discontinued parts.
- Produces strange noises or inconsistent heating.
Replacing an older system with a modern condensing combi boiler can improve energy efficiency by up to 30%, helping you save hundreds annually on gas bills.
Comparing Short-Term vs Long-Term Costs
Option | Upfront Cost | Expected Lifespan | Energy Efficiency | Long-Term Value |
Repair | £100 – £500 | 1–3 years (depending on condition) | May remain low | Short-term fix |
Replacement | £2,000 – £4,500 | 10–15 years | Up to 94% efficient | Long-term investment |
While repairs seem cheaper initially, replacing your boiler can deliver substantial long-term savings and fewer unexpected expenses.
Combi Boiler Replacement in Sevenoaks
Combi boilers are the most popular choice for homes in Sevenoaks, providing both heating and hot water from a single, compact unit.
A combi boiler replacement typically costs between £2,000 and £3,200, depending on the make, model, and whether additional upgrades (like new controls or pipework) are required.
Advantages of upgrading to a new combi boiler include:
- Instant hot water without storage tanks
- Higher energy efficiency ratings (A-rated)
- Compact, space-saving design
- Lower energy bills
- Modern controls, including smart thermostats
Kentish Plumbers specialise in combi boiler replacements in Sevenoaks and Tunbridge Wells, offering fixed prices, extended warranties, and expert installation from fully qualified Gas Safe engineers.
What Influences the Cost of a Boiler Replacement?
The final cost of your installation can depend on:
- Boiler brand and model – Premium brands (e.g. Worcester Bosch, Vaillant) cost more but offer superior reliability.
- System conversion – Switching from a system or regular boiler to a combi may add £500–£800.
- Flue or pipework upgrades – Required for safety and compliance.
Controls – Adding smart thermostats or zoning controls can cost an extra £200–£300.
Boiler Finance and Payment Options
At Kentish Plumbers, we understand a boiler replacement is a major home expense. That’s why we offer flexible finance plans to spread the cost into manageable monthly payments.
Available options include:
- 0% interest-free finance (subject to approval)
- Low-interest finance over 2–10 years
- “Buy Now, Pay Later” options
This means you can enjoy a warm, efficient home today — without the financial pressure of paying upfront.
How to Decide Between Repair or Replacement
If you’re unsure whether to repair or replace your boiler, consider the 50% rule:
If your repair estimate is more than half the price of a new boiler, replacement is usually more economical.
You should also factor in:
- Current efficiency rating
- Warranty status
- Energy bills and carbon footprint
- Frequency of breakdowns
An expert from Kentish Plumbers can assess your boiler and provide honest advice, ensuring you make a financially and environmentally sound decision.
Why Choose Kentish Plumbers?
- Gas Safe registered engineers
- Transparent, fixed-price quotes
- Quick turnaround and tidy installations
- Finance options available
- Extended manufacturer warranties
- Trusted by homeowners across Sevenoaks and Tunbridge Wells
Whether you choose repair or replacement, our experienced engineers deliver reliable, safe, and efficient heating solutions tailored to your home.
When deciding between boiler repair and replacement, it’s crucial to balance short-term costs against long-term value.
If your boiler is still young and the repair is minor, fixing it may be enough. But if it’s ageing, inefficient, or frequently breaking down, investing in a new combi boiler replacement in Sevenoaks will offer greater reliability, comfort, and savings in the years ahead.
For professional advice and a free, fixed-price quote, contact Kentish Plumbers today. We’ll help you find the best solution for your home — whether that’s a simple repair or a brand-new boiler installation.
Related articles
Which fuel powers your boiler?
Mains Gas
LPG
At a glance
A faulty boiler can quickly turn from a mild inconvenience into a stressful, expensive problem — especially during the colder months in Sevenoaks or Tunbridge Wells. But before you commit to a costly new installation, it’s worth asking: is it better to repair or replace your boiler?
In this guide, we’ll help you understand boiler repair costs vs replacement costs, what factors affect each, and how to decide what’s most cost-effective in the long run.
Typical Boiler Repair Costs in the UK
The average boiler repair cost in the UK typically ranges between £100 and £500, depending on the issue and parts required. However, more serious faults can cost upwards of £1,000, especially for older boilers with limited spare parts.
Common Boiler Problem | Average Repair Cost (UK) |
Minor leak or pressure fix | £100 – £200 |
Faulty thermostat | £80 – £150 |
Broken fan or pump | £200 – £350 |
Heat exchanger replacement | £400 – £800 |
Control board (PCB) issue | £300 – £600 |
While repairs are often cheaper upfront, frequent callouts or major component failures can quickly add up. If your repair costs exceed half the price of a new boiler, replacement is usually the smarter option.
Which fuel powers your boiler?
Mains Gas
LPG
It just takes 60 Seconds
And then you can book a free consultation
Boiler Replacement Costs in Sevenoaks
For homeowners in Sevenoaks and nearby areas, the average boiler replacement cost typically falls between £2,000 and £4,500, depending on the system type, brand, and installation requirements.
Boiler Type | Average Cost (Including Installation) |
Combi Boiler | £2,000 – £3,200 |
System Boiler | £2,300 – £3,800 |
Regular Boiler | £2,500 – £4,500 |
If you’re replacing an old combi boiler with a new, energy-efficient model, Kentish Plumbers can often complete the installation within a single day, minimising disruption and restoring comfort to your home quickly.
When Is Repair the Right Choice?
Repairing your existing boiler might be the best choice if:
- The boiler is under 8 years old and has been regularly serviced.
- The issue is minor, such as a faulty sensor, valve, or thermostat.
- You have a valid manufacturer’s warranty that covers parts or labour.
- The system is otherwise reliable and energy-efficient.
In these cases, a simple repair could extend your boiler’s life by several years without major expense.
When Is Replacement the Smarter Option?
In contrast, replacement is often the most cost-effective decision when your boiler:
- Is 10–15 years old or older.
- Has frequent or recurring breakdowns.
- Is inefficient and drives up energy bills.
- Uses outdated or discontinued parts.
- Produces strange noises or inconsistent heating.
Replacing an older system with a modern condensing combi boiler can improve energy efficiency by up to 30%, helping you save hundreds annually on gas bills.
Comparing Short-Term vs Long-Term Costs
Option | Upfront Cost | Expected Lifespan | Energy Efficiency | Long-Term Value |
Repair | £100 – £500 | 1–3 years (depending on condition) | May remain low | Short-term fix |
Replacement | £2,000 – £4,500 | 10–15 years | Up to 94% efficient | Long-term investment |
While repairs seem cheaper initially, replacing your boiler can deliver substantial long-term savings and fewer unexpected expenses.
Combi Boiler Replacement in Sevenoaks
Combi boilers are the most popular choice for homes in Sevenoaks, providing both heating and hot water from a single, compact unit.
A combi boiler replacement typically costs between £2,000 and £3,200, depending on the make, model, and whether additional upgrades (like new controls or pipework) are required.
Advantages of upgrading to a new combi boiler include:
- Instant hot water without storage tanks
- Higher energy efficiency ratings (A-rated)
- Compact, space-saving design
- Lower energy bills
- Modern controls, including smart thermostats
Kentish Plumbers specialise in combi boiler replacements in Sevenoaks and Tunbridge Wells, offering fixed prices, extended warranties, and expert installation from fully qualified Gas Safe engineers.
What Influences the Cost of a Boiler Replacement?
The final cost of your installation can depend on:
- Boiler brand and model – Premium brands (e.g. Worcester Bosch, Vaillant) cost more but offer superior reliability.
- System conversion – Switching from a system or regular boiler to a combi may add £500–£800.
- Flue or pipework upgrades – Required for safety and compliance.
Controls – Adding smart thermostats or zoning controls can cost an extra £200–£300.
Boiler Finance and Payment Options
At Kentish Plumbers, we understand a boiler replacement is a major home expense. That’s why we offer flexible finance plans to spread the cost into manageable monthly payments.
Available options include:
- 0% interest-free finance (subject to approval)
- Low-interest finance over 2–10 years
- “Buy Now, Pay Later” options
This means you can enjoy a warm, efficient home today — without the financial pressure of paying upfront.
How to Decide Between Repair or Replacement
If you’re unsure whether to repair or replace your boiler, consider the 50% rule:
If your repair estimate is more than half the price of a new boiler, replacement is usually more economical.
You should also factor in:
- Current efficiency rating
- Warranty status
- Energy bills and carbon footprint
- Frequency of breakdowns
An expert from Kentish Plumbers can assess your boiler and provide honest advice, ensuring you make a financially and environmentally sound decision.
Why Choose Kentish Plumbers?
- Gas Safe registered engineers
- Transparent, fixed-price quotes
- Quick turnaround and tidy installations
- Finance options available
- Extended manufacturer warranties
- Trusted by homeowners across Sevenoaks and Tunbridge Wells
Whether you choose repair or replacement, our experienced engineers deliver reliable, safe, and efficient heating solutions tailored to your home.
When deciding between boiler repair and replacement, it’s crucial to balance short-term costs against long-term value.
If your boiler is still young and the repair is minor, fixing it may be enough. But if it’s ageing, inefficient, or frequently breaking down, investing in a new combi boiler replacement in Sevenoaks will offer greater reliability, comfort, and savings in the years ahead.
For professional advice and a free, fixed-price quote, contact Kentish Plumbers today. We’ll help you find the best solution for your home — whether that’s a simple repair or a brand-new boiler installation.
Related articles
Which fuel powers your boiler?
Mains Gas
LPG
