New Boiler Cost by Type in 2026 | Combi, System & Regular

The cost of a new boiler depends heavily on the type of heating system you choose. As a broad guide from the supplied 2026 pricing data, a fully installed boiler can range from around £1,800 to £5,000, with oil boilers starting slightly higher. The final amount can vary depending on the boiler model, output, existing heating system and complexity of the installation.

A straightforward like-for-like replacement will normally sit towards the lower end of the range, while changing boiler type, moving the boiler or altering pipework can push the price higher.

Quick Answer: How Much Does a New Boiler Cost?

Based on the supplied 2026 pricing guide:

These are indicative ranges rather than fixed prices. Installation difficulty, property requirements and additional work can change the final quotation considerably.

Why Does Boiler Type Affect the Price?

Different boiler types require different heating-system layouts.

A combi boiler provides heating and hot water directly from one appliance, while system and regular boilers normally work alongside a separate hot water cylinder.

This affects:

• The amount of pipework required
• Whether a hot water cylinder is needed
• Installation labour
• Space requirements
• Controls and associated components
• How much of the existing heating system can be reused

Replacing an existing boiler with the same type is generally simpler than converting the property to a completely different heating arrangement.

1. Combi Boiler Cost

Typical installed cost: £1,800 to £4,500

A combi boiler, short for combination boiler, provides both central heating and hot water from one compact appliance.

It heats water when required, so there is normally no separate hot water cylinder or cold water storage tank.

This makes combi boilers particularly popular in:

• Flats
• Bungalows
• Small and medium-sized houses
• Homes with one main bathroom
• Properties where storage space is limited

The supplied pricing data places a new combi boiler itself at approximately £600 to £2,500, with the total installed cost typically increasing to £1,800 to £4,500.

Why can combi installation prices vary?

A straightforward combi-to-combi replacement in the same location may require relatively little alteration.

Costs can rise if:

• The boiler is moved
• Gas pipework needs changing
• A new flue route is required
• Condensate drainage needs modification
• Heating controls are upgraded
• The heating system requires additional cleaning or repairs
• The property is being converted from a system or regular boiler

The boiler output also matters. A larger property or household with higher hot-water demand may require a different model or heating-system arrangement.

2. System Boiler Cost

Typical installed cost: £1,800 to £5,000

A system boiler works with a separate hot water cylinder.

Unlike a combi boiler, it stores heated water so that larger quantities of hot water can be available when required.

System boilers are particularly suitable for:

• Medium to large properties
• Homes with two or more bathrooms
• Households with higher hot water demand
• Properties already fitted with a suitable hot water cylinder

The supplied source estimates a fully installed system boiler at approximately £1,800 to £5,000.

Why choose a system boiler?

One major advantage is the ability to provide stored hot water.

In a property where several taps or showers may be used at the same time, a suitable system boiler and cylinder arrangement may provide better hot-water performance than a combi boiler.

However, a cylinder requires additional space.

Installation can also become more expensive if the property is being converted from another heating-system type.

3. Regular or Conventional Boiler Cost

Typical installed cost: £1,800 to £5,000

Regular boilers are also commonly called:

• Conventional boilers
• Heat-only boilers
• Traditional boilers

They normally operate with a separate hot water cylinder and, depending on the system, may also use a cold water storage cistern.

Regular boilers remain common in older UK properties where the existing heating system was originally designed around this arrangement.

According to the supplied pricing guide, a new regular boiler with installation typically falls between £1,800 and £5,000.

When might keeping a regular boiler make sense?

Replacing an existing regular boiler with another compatible regular boiler can sometimes avoid major changes to the rest of the heating system.

This can be useful in properties with:

• Existing cylinders and tanks in good condition
• Multiple bathrooms
• Traditional heating layouts
• Higher stored hot water demand

By comparison, converting a regular boiler system to a combi can involve removing redundant equipment and altering considerable amounts of pipework.

That additional labour can increase the total installation cost.

4. Electric Boiler Cost

Typical installed cost: £1,800 to £5,000

Electric boilers heat water using electrical elements rather than burning gas or oil.

They can be useful where:

• The property does not have a mains gas connection
• Installing a conventional boiler flue would be difficult
• Space is limited
• A compact heating appliance is required

The supplied source places typical installed electric boiler costs between approximately £1,800 and £5,000.

Electric boilers can have simpler installation requirements in some properties because they do not require a gas supply or combustion flue.

However, the property’s electrical supply needs to be suitable for the boiler’s power requirements.

Running costs should also be considered separately from installation cost.

A cheaper or simpler installation does not necessarily mean the heating system will be cheaper to operate over its lifetime.

5. Oil Boiler Cost

Typical installed cost: £2,200 to £5,000

Oil boilers are primarily used in properties without access to mains gas.

They are particularly common in:

• Rural areas
• Off-grid properties
• Larger country homes

Unlike a mains-gas boiler, an oil heating system also requires suitable fuel storage.

The supplied source estimates a new oil boiler and installation at around £2,200 to £5,000.

The final price may depend on the condition and suitability of:

• Oil storage tank
• Oil supply line
• Existing flue
• Heating system
• Boiler location

A straightforward oil-boiler replacement can therefore be very different from installing a complete oil heating system from scratch.

Boiler-Only Price vs Installed Boiler Cost

This distinction is important.

A boiler may be advertised at £700, £1,200 or £2,000, but that does not mean this is what the complete replacement will cost.

The total price can also include:

• Gas Safe engineer labour
• Flue
• Pipework and fittings
• Heating controls
• Magnetic filter
• System cleaning
• Condensate alterations
• Electrical work
• Removal of the old appliance
• Testing and commissioning

The supplied guide gives boiler-only costs ranging broadly from around £600 into several thousand pounds, depending on boiler type, brand and specification.

For homeowners, the fully installed price is therefore normally the more useful number to compare.

Which Boiler Type Is Cheapest to Install?

There isn’t one boiler type that is automatically cheapest for every property.

Usually, the cheapest option is the one requiring the least alteration to the existing heating system.

For example:

Existing combi → new combi in same location

will generally be easier than:

Regular boiler → new combi in a different location

Even if the actual boilers cost roughly the same, the second job may involve much more labour and additional materials.

This is why boiler type should not be considered separately from the existing installation.

Which Boiler Type Is Best for a Small Home?

A combi boiler is often considered for smaller homes because it does not require a separate hot water cylinder.

This can be useful where storage space is limited.

However, the correct boiler still depends on:

• Heating demand
• Number of bathrooms
• Mains water flow
• Hot water usage
• Existing system

Property size alone should not determine boiler selection.

Which Boiler Type Is Better for a Larger Home?

A system boiler or regular boiler may be considered where the property has higher simultaneous hot water demand.

For example, a larger family home with several bathrooms may benefit from stored hot water.

That doesn’t automatically mean a combi boiler is unsuitable. The correct system needs to be selected around actual heating and hot-water requirements.

Does Boiler Brand Affect the Cost?

Yes.

The supplied source shows noticeable price differences between brands including:

• Worcester Bosch
• Vaillant
• Viessmann
• Ideal
• Alpha
• Baxi

Differences can come from:

• Boiler specification
• Output
• Product range
• Heat exchanger design
• Controls
• Warranty
• Manufacturer positioning

However, price alone should not be used to choose a boiler.

Availability of servicing, replacement parts and long-term support should also be considered.

What Can Increase the Cost of Any Boiler Type?

Whichever boiler you choose, several installation factors can increase the total price.

Boiler relocation

Moving the appliance means additional work may be required for:

• Gas pipework
• Heating pipes
• Water pipes
• Condensate drainage
• Electrical connections
• Flue routing

Flue alterations

A non-standard or vertical flue can require more parts and labour than a straightforward horizontal installation.

Gas pipe upgrades

Existing gas pipework may need altering if it does not meet the requirements of the replacement appliance.

Heating controls

New thermostats, programmers or smart controls can add to the initial installation price.

Magnetic filter

A magnetic filter may be installed to help capture circulating magnetite and debris.

Heating-system cleaning

Existing contamination or sludge may mean appropriate system cleaning is required before the new boiler is commissioned.

Radiator replacement

A new boiler does not automatically mean the radiators need replacing.

However, damaged, heavily corroded or incorrectly sized radiators may need separate attention.

The source identifies all of these as potential factors affecting the final new-boiler price.

Should You Repair Your Existing Boiler Instead?

Before spending several thousand pounds on a new boiler, it is worth finding out exactly what is wrong with the existing appliance.

A boiler breakdown does not automatically mean the whole boiler needs replacing.

Depending on the diagnosis, the problem could involve a replaceable component such as:

• Pump
• Fan
• PCB
• Diverter valve
• Gas valve
• Expansion vessel
• Sensor
• Electrode
• Heat exchanger

Whether repair makes financial sense depends on the boiler’s age, condition, repair history and the cost and availability of the required component.

This can be particularly important when the rest of the boiler is still serviceable.

Need a Replacement Boiler Part?

Heating & Catering Parts supplies a wide range of boiler spares for major UK boiler brands.

If a heating engineer has diagnosed the faulty component, always confirm compatibility before ordering.

Useful details include:

• Boiler manufacturer
• Full boiler model
• GC number where available
• Manufacturer part number
• Existing component number
• Clear photo of the boiler data plate
• Clear photo of the existing part

Never order an internal boiler component based only on the visible symptom or fault code.

Frequently Asked Questions