If you’re researching the new boiler cost, you’re probably seeing a wide range of prices online – and wondering what’s actually realistic.
Some websites suggest you can get a new boiler for under £2,000, while others quote £4,000 or more. The truth is that how much a new boiler costs depends on several factors, including the boiler type, your property, and whether any system changes are required.
In this 2026 guide, we’ll explain:
The average boiler installation cost
What affects the final price
Boiler costs by type and property size
When replacing a boiler makes financial sense
Across the UK, the average boiler installation cost typically falls between £2,000 and £4,500, depending on the complexity of the work.
| Installation Type | Typical Cost Range |
|---|---|
| Like-for-like boiler replacement | £2,000 – £2,800 |
| Combi boiler installation | £2,200 – £3,200 |
| System change (conventional → combi) | £3,000 – £4,500+ |
| Full central heating installation | £4,500 – £7,000+ |
For a location-specific breakdown and what’s included, see our boiler installation page.
A-rated boilers installed from £1795
1.Boiler Type
The type of boiler you choose has the biggest impact on the boiler replacement cost.
Combi boilers are usually the most cost-effective
System boilers may need extra components
Regular boilers are often more expensive in older homes
Choosing the right option during your
new boiler installation helps avoid unnecessary costs later.
2.Property Size & Hot Water Demand
Larger homes generally need:
Higher-output boilers
More complex pipework
Additional radiators
This increases both material and labour costs and directly affects how much a new boiler costs overall.
3.System Changes & Additional Work
Some installations require extra work, such as:
Removing tanks or cylinders
Pipework alterations
System flushing
In certain homes, a gas pipe upgrade may also be required to meet current safety standards.
| Property Type | Typical Boiler Size | Installed Cost Range |
|---|---|---|
| 1–2 bedroom flat | 24–28kW | £2,000 – £2,600 |
| 3 bedroom house | 28–32kW | £2,400 – £3,200 |
| 4+ bedroom house | 32–40kW+ | £3,000 – £4,500+ |
Many homeowners hesitate to replace their boiler because of the upfront cost. However, repeated repairs can quickly exceed the cost of replacement.
| Boiler Condition | Recommended Action |
|---|---|
| Under 8 years old | Repair usually makes sense |
| 10–12+ years old | Replacement often cheaper long-term |
| Frequent breakdowns | Replacement recommended |
This is also where boiler cover and home care plans can help reduce unexpected repair costs after installation.
Get complete boiler cover from £12p/m
You can lower long-term costs by:
Installing the correct boiler size
Using modern heating controls
Servicing the boiler annually
Protecting it with ongoing cover
A professionally installed boiler should last 12–15 years with proper care.
The only reliable way to know the true cost of a new boiler installed is through a proper assessment that considers:
Your property layout
Existing heating system
Hot water usage
If you’re considering replacement, our boiler installation service offers clear advice, transparent pricing, and qualified engineers.
Get complete boiler cover from £12p/m
A-rated boilers installed from £1795
Book your boiler service for just £108
Boiler not working? We’ll fix it from £108
Premium cylinders installed from £1599
Free survey & quote for all ASHP installs
