Updated: April 28, 2024

How much is a new boiler?

When considering purchasing a new boiler, cost is often a primary concern. While boilers can be a significant investment, opting for a quality unit is a wise decision for long-term efficiency and reliability. Discover the best boiler replacement cost with us.

The cost of a new boiler is primarily determined by installation requirements, the type of home you reside in, and any additional features or upgrades.

Ensuring your boiler is efficient and durable is essential for longevity. We’ll explore the costs associated with various types of boilers and the expenses involved in replacing your current system.

Whether you’re interested in understanding the cost of a combi, system, or regular boiler, our team is here to provide guidance and assistance every step of the way.

The price for a new boiler replacement can vary, depending on many crucial elements:

  • The type of boiler you want to install in your house (e.g. combi, system or regular)
  • Moving you boiler to a different location
  • The model you aim to buy (e.g. mid-range vs. premium)
  • Converting your current boiler with another type (e.g. system to combi)
  • The extras you get (e.g. filters, a controller or smart thermostats)

Undoubtedly, replacing your current combi boiler with another is more cost-effective than converting your system boiler to a combi.

Converting your boiler entails additional time, labor, and materials, not to mention the complexity of the entire process.

The choice of boiler model also significantly influences the overall cost. Here at Let’s Heat, we offer some of the best brands in the industry, including Alpha, Worcester Bosch, and Viessmann.

We provide multiple payment options for our customers. Whether you prefer to pay in cash or opt for a boiler finance plan, we ensure flexibility to suit your needs, allowing you to pay monthly for your new boiler.


How much does a new boiler cost?

Here’s a table of the average prices for boilers:

New boiler install£2,899
Combi to combi swap£1,795
System to system£1,999
System to combi conversion£2,499
Back boiler to a combi£3,299
Megaflo unvented boiler£2,499

All in all, combi boilers sell for £1,500 to £2,750.  While system boilers can sell for £1,600 – £2,900 and regular or heat only boilers go for for £1800 – £3,200.

How much does a standalone boiler cost?

All things considered, it is hard to pinpoint exactly how much a standalone boiler costs. But the range starts from £600 to £2,500.

How much does a new combi boiler cost?

combi boiler can cost between £1,500 and £3,000 depending on the model in question. This price includes the following:

  • Firstly, the price of the new combi boiler itself.
  • Secondly, installation cost
  • Lastly, warranty registration

This is the cost you can expect to pay. It also includes VAT.

The labour cost can vary, without a doubt, if you want to replace:

  • An existing combi boiler with a combi boiler
  • A system boiler with a combi boiler
  • A regular (heat only) or a back boiler with a combi boiler

Other factors which might influence the price for combi boilers:

  • The complexity around your boiler flue
  • Amount of new pipework
  • Moving your boiler
  • What floor your boiler is on (scaffolds might be needed in flats)
  • Location inside the UK (London has higher prices)
  • Warranty length

Several factors can influence the price of a combi boiler. However, replacing one combi boiler with another is typically a straightforward process.

A mid-range combi boiler might cost approximately £1,800, offering a generous 10-year warranty. For instance, the Worcester Bosch 2000 boiler exemplifies such a cost-effective option.

Undoubtedly, the cost will rise if you’re replacing your current boiler system with a different one.


Regular Boilers and how does it works

system boiler replacement cost

The cost of replacing a system boiler with a combi boiler typically ranges from £2,300 to £3,000. By opting for a combi boiler, you can benefit from its space-saving design, which frees up additional space in your home.

The process of replacing a system boiler with a combi boiler is a significant undertaking and involves additional work. It is estimated that the installation team will require 2-3 days to complete the job thoroughly.

The cost of a system to combi boiler conversion starts at around £2,300 for a basic to mid-range boiler. If you prefer a higher-end boiler, the price would be approximately £3,000 in total.

A System boiler replacement cost (swap)

The cost of replacing your existing system boiler can vary significantly, typically ranging between £1,600 and £2,900. This estimate covers the expenses associated with replacing the boiler unit itself, excluding any changes to the water tank.

For a basic system boiler with a five-year warranty, expect to spend around £1,600. Conversely, a higher-end system boiler replacement, featuring advanced features from a reputable brand, could cost anywhere from £1,900 to £2,900, depending on the specific model and manufacturer.

Regular boiler replacement cost and prices

Firstly, a regular boiler replacement can cost around £1,900 to £2,200.

The estimated price does not include the cost of a new hot or cold water tank, as these typically have longer lifespans and do not require replacement with the boiler.

For a budget heat-only boiler with a shorter warranty, prices could start at around £1,900. Conversely, a mid to high-end heat-only boiler with a longer warranty might cost approximately £2,200.

Regular Boiler to Combi Boiler Conversion Cost and Prices

Converting your regular boiler to a combi boiler typically costs between £2,300 and £2,500. During this conversion, the water tank will be removed since it is no longer needed. Sometimes, the cold water tank may remain in place due to removal difficulties.

For a basic combi boiler with a limited warranty, you might pay around £2,300. Prices for mid-range and higher-end boilers can range up to £2,500.

Back Boiler Replacement Costs and Prices

Replacing back boilers with new units is generally not allowed due to regulations. Back boilers are known for being costly to operate, unreliable, and environmentally unfriendly. Many homeowners opt to replace them with combi boilers.

Back Boiler to Combi Boiler Conversion Costs

Converting from a back boiler to a combi boiler would cost approximately £3,100 to £3,200 for a budget-friendly combi boiler with a limited warranty. For a mid to high-end combi boiler, the price could be around £3,500.

In addition to the boiler itself, consider the costs of a boiler flue and a waste condensate pipe. Investing in a combi boiler can be worthwhile due to improved efficiency and potential home value increases.


The average cost of a new boiler

Here’s a table of the average cost of a new boiler installed and fully working:

Type of boilerAverage cost
regular (heat only) boiler£2,100
Average system boiler£1,950
Average combi boiler£1,800
Average Megaflo£1,900

Gas boiler costs

The cost for a mid-range gas combi boiler is typically around £1,800, while a mid-range gas system boiler might be approximately £1,950. For a regular (heat-only) gas boiler, the average price is around £2,100.

These prices include the cost of installation and any additional work required.

Boiler Installation in

How long would a boiler last?

A new boiler should at least last for 10 years. But the expected lifespan for a boiler is from 10 to 15 years working at high efficiency.

Boiler relocation costs

Relocating a boiler can be a more expensive endeavor as it involves additional fittings, fixtures, extra pipework, and substantial physical labor.

We recommend avoiding boiler relocation unless it is absolutely necessary. Situations where relocation may be required include replacing a back boiler with a combi, system, or regular boiler.

The cost of moving your boiler from the kitchen to an adjacent room might be around £200. However, relocating your boiler from the kitchen to the loft could cost approximately £400 to £600.


New heating controls and smart thermostat cost

Boiler Lifespan

A new boiler should last at least 10 years, with an expected lifespan ranging from 10 to 15 years if maintained at high efficiency.

Boiler Relocation Costs

Relocating a boiler can be costly due to additional fittings, fixtures, extra pipework, and labor. It’s advisable to avoid relocation unless necessary, such as when replacing a back boiler.

  • Moving a boiler from the kitchen to an adjacent room may cost around £200.
  • Relocating a boiler from the kitchen to the loft could range from £400 to £600.

New Heating Controls and Smart Thermostat Costs

Boiler operation management is convenient through controllers or smartphone apps.

  • Controllers range from £30 to £300.
  • Smart thermostats vary in price from £100 to £300.

Plume Kit Expenses

Plume kits, used to extend boiler flues away from neighboring properties, cost between £75 and £150 for combi, regular, or system boilers.

Chemical Flush Investment

A chemical flush, eliminating sludge from heating systems, typically costs between £50 to £150. It’s essential for efficient hot water circulation and to address radiator cold spots.

Boiler Flue Expenditure

Boiler flues direct exhaust gases outside for safety.

  • Horizontal flue installation usually has no extra costs.
  • Vertical flues, requiring more complex installation, range from £500 to £2,000 based on type and length.

Magnetic Boiler Filter Cost

Magnetic boiler filters, protecting boilers by trapping dirt and metal particles, cost between £100 to £200. Installed inline on pipework, they prevent debris from entering the boiler, reducing potential damage and leaks.


Prices for different boiler brands

Combi boilers

  • Baxi £880 – £1,000
  • Glow Worm £700 – £990
  • Ideal £590 – £1,270
  • Potterton £650 – £1,350
  • Vaillant £1,160 – £1,410
  • Viessmann £780 – £1,280
  • Worcester Bosch £800 – £2,460

Heat only boilers

  • WORCESTER-BOSCH GREENSTAR UTILITY 50 – 70 (OIL)– £1,700 – £1,900
  • GREENSTAR FS 42CDI REGULAR – £1,500-£1700
  • WB GREENSTAR 30CDI REGULAR -£1,200-£1,300
  • VAILLANT ECOTEC PLUS 428 – £800 – £900
  • ECOTEC PLUS 415– £600-£800

What are the types of gas boiler replacement?

If you’re getting a new boiler, then you should know that there are three major types:

Combi boilers

  • Their compact design makes them perfect for homes with limited space
  • Do not require a hot water storage cylinder or a cold-water tank
  • Unsuitable for homes larger homes with multiple bathrooms and a high demand for hot water
  • Not suitable for areas with low mains water pressure

Regular (heat only) boilers

  • Good for homes with multiple bathrooms and a high hot water demand 
  • Perfect for areas with low water pressure from the mains
  • Suitable for homes with older heating systems that may not be able to tolerate high pressure
  • They take space since they need a cistern tank
  • A tank in the attic can freeze in winter and might cause many problems if it starts leaking

System boilers

  • Also recommend for homes with more than one bathroom and a high demand for hot water
  • Do not need a tank in the attic
  • Internal components can make installation much easier.
  • Unsuitable for areas with low water pressure 
  • Not suitable for homes with traditional heating systems that can’t tolerate high water pressure 
  • You need to consider where to put the water tank if a system boiler is replacing your combi boiler.

Read about: What is a combi boiler and How They Work

Emergency Boiler Repair

Which boiler brand to choose from?

Choosing a Boiler Brand

Here are some reputable boiler brands to consider:

  • Worcester Bosch: Known for reliability and energy efficiency, offering models for various heating systems.
  • Vaillant: Offers reliable and efficient boilers, including combi, system, and regular boilers.
  • Baxi: Well-established brand with efficient and durable boiler options for different heating needs.
  • Viessmann: German brand known for high-quality boilers and innovative heating solutions.
  • Ideal: Popular for affordable and reliable boilers, catering to different property sizes and heating systems.

When selecting a boiler brand, consider factors like your property size, hot water demands, preferred fuel type, and specific features or requirements. Each brand offers a range of models to suit various needs and preferences.

About Us

About Let’s Heat

At Let’s Heat, we specialize in upgrading and improving heating systems for our clients. We take pride in our work and are committed to delivering top-notch heating solutions.

When you choose Let’s Heat, you can be confident that you’re working with the best engineers in the industry. Our team consists of Gas Safe Registered professionals, ensuring exceptional work quality and adherence to safety standards. Additionally, our boiler installation and repair specialists are fully certified and insured to meet the highest industry standards. Each member of our team is a seasoned expert in their field, prioritizing safety above all else.

We offer our services seven days a week to ensure exceptional customer support for all your boiler installation and plumbing needs.

Let’s Heat has an extensive network of Gas Safe Registered engineers covering England, Scotland, and Wales, providing comprehensive coverage for our valued clients.

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How much does it cost to swap out a boiler?

combi boilers sell for £1,500 to £2,750.  While system boilers can sell for £1,600 – £2,900 and regular or heat only boilers go for for £1800 – £3,200.

How often should a boiler be replaced?

he average boiler lasts around 15 years if well maintained and although a yearly service can improve the lifespan, an older boiler has to work harder to heat your home.

How much does it cost to install a replacement boiler?

The most affordable boiler for most UK households is a new combi boiler, costing £500 – £3,000; or a conventional boiler

When is the best time to get a new boiler installation?

There’s not always a right time. However, if you’re planning on replacing yours before it completely packs up, then it is recommend that you do it during the summer months. Summer time is the best because you will be less reliant on heating and hot water so the process should be pain free.

What does installing a new boiler involve?

After the installation of your new boiler, you should make sure that the heating engineer provides you with a Building Regulations Compliance certificate. This certificate confirms that the unit has been safely installed, and that the installation of your boiler has been registered with the manufacturer to validate the warranty as well. Most manufacturers request that this takes place within 30 days of installation.
In order to keep your warranty valid, your boiler should be serviced annually by a Gas Safe registered engineer. This means that they will inspect your boiler inside and out, checking the flue pipe, ensuring that the gas pressure is correct and checking how the boiler performs during operation.