New Boiler Installation & Costs

New Boiler Installation

The Right Boiler and Heating System for Your Home

A new boiler installation should provide reliable heating, dependable hot water and better control over the way your home uses energy.

The project may involve replacing an old boiler, converting a traditional heating system to a combi boiler or installing central heating throughout a property that does not currently have a wet heating system.

Each of these projects requires a different approach.

A straightforward boiler replacement may reuse much of the existing heating system. A complete new installation could require new radiators, heating pipes, hot-water services, controls, electrical work, a gas supply, flue and condensate drainage.

The boiler should therefore be selected as part of the complete heating design rather than treated as a separate appliance.

APN Boilers helps homeowners find experienced heating professionals who can assess the property, explain the available options and recommend a boiler installation that suits the home and household.

Why Install a New Boiler?

A homeowner may need a new boiler because:

The existing boiler has broken down.
Repairs are becoming increasingly expensive.
Replacement parts are difficult to obtain.
The old boiler is noisy or unreliable.
Heating and hot-water performance is poor.
The property is being extended or refurbished.
Additional radiators or bathrooms are being installed.
The homeowner wants to remove tanks and a hot-water cylinder.
A new central-heating system is required.
The boiler needs to be moved.
Better heating controls are required.
The property is being converted or divided.

A boiler that continues to produce heat is not necessarily economical to retain. Older boilers may be less efficient and may be connected to basic controls that make it difficult to manage heating effectively. Energy Saving Trust advises that choosing an efficient boiler and using appropriate heating controls can reduce energy use and improve overall heating performance.

Planning the installation before complete boiler failure also gives the homeowner time to compare systems, obtain detailed quotations and decide whether the wider heating arrangement should be improved.

What Does a New Boiler Installation Include?

The exact work depends on the existing property and the type of system being installed.

A typical installation may include:

Removing the existing boiler.
Supplying the new boiler.
Installing the boiler and flue.
Providing condensate drainage.
Altering the gas supply pipe.
Connecting heating flow and return pipes.
Altering hot- and cold-water services.
Installing heating controls.
Cleaning the existing heating system.
Fitting a magnetic filter.
Adding corrosion inhibitor.
Testing and balancing radiators.
Commissioning the appliance.
Registering the manufacturer’s warranty.
Completing Building Regulations notification.
Removing waste and redundant equipment.

A complete new heating installation may also include radiators, pipework, pumps, valves, a hot-water cylinder and electrical supplies.

The quotation should clearly identify which of these elements are included.

Boiler Replacement or Complete New Heating System?

The term new boiler installation can describe several different types of work.

Like-for-Like Boiler Replacement

This usually means replacing the existing boiler with a similar type of boiler in the same location.

Examples include:

Combi boiler to new combi boiler.
System boiler to new system boiler.
Regular boiler to new regular boiler.

This is normally the least disruptive and least expensive option because much of the existing pipework can remain.

However, the installer should still check the gas supply, flue, condensate drainage, radiators, system water and heating controls.

Changing the Boiler Type

The homeowner may want to change from:

A regular boiler to a combi boiler.
A system boiler to a combi boiler.
A combi boiler to a system boiler.
A conventional tank system to a pressurised system.
Gas, oil or LPG heating to another system.

This normally involves more work because pipework, controls and hot-water storage arrangements must be altered.

Complete New Central Heating

A property without a suitable wet heating system may require:

A new boiler.
New heating pipes.
New radiators.
Radiator valves.
Heating zones.
A hot-water cylinder.
New hot- and cold-water services.
Electrical circuits.
Heating controls.
Floor, wall and ceiling alterations.

This should be designed alongside the building layout, particularly when the property is undergoing major refurbishment.

Choosing the Right Boiler Type

The three principal domestic boiler arrangements are combi, system and regular boilers. Energy Saving Trust explains that the right choice depends on factors including the property, existing system and hot-water requirements.

Combi Boilers

A combi boiler provides heating and instantaneous hot water from one appliance.

It does not normally require a separate hot-water cylinder or large loft storage tank.

A combi may be suitable for:

Flats.
Small and medium-sized houses.
Homes with one principal bathroom.
Properties with good mains water pressure and flow.
Households with moderate hot-water demand.
Homes where storage space is limited.

System Boilers

A system boiler works with a separate hot-water cylinder.

It may be suitable for:

Family homes.
Properties with more than one bathroom.
Homes with higher hot-water demand.
Households using several hot-water outlets.
Properties that already have a suitable cylinder.

Regular Boilers

A regular or heat-only boiler works with separate heating controls and a hot-water cylinder. Some systems also use loft tanks.

A regular boiler may remain appropriate where:

The existing traditional system is in good condition.
The property has several bathrooms.
Water pressure is limited.
The homeowner wants to retain the cylinder.
Changing the system would cause unnecessary disruption.

The installer should explain why a particular boiler type is recommended rather than automatically proposing a combi boiler for every home.

New Combi Boiler Installation

A new combi boiler installation is one of the most popular choices for flats and smaller family homes.

A combi boiler can replace an older system containing:

A separate boiler.
A hot-water cylinder.
A feed-and-expansion tank.
A large cold-water storage tank.
Older pumps and motorised valves.

Removing these components can release cupboard and loft space and simplify the heating arrangement.

However, converting to a combi is not simply a boiler change.

The installer may need to:

Remove the cylinder and tanks.
Alter the heating flow and return pipes.
Connect hot-water outlets to the mains supply.
Upgrade the gas pipe.
Install a new flue.
Provide condensate drainage.
Remove redundant controls.
Test the water pressure and flow.

A combi boiler heats water directly from the incoming mains supply. Its hot-water performance is therefore limited by the water available to the property.

Before recommending a new combi boiler installation, the installer should establish:

The incoming water pressure.
The incoming flow rate.
The number of bathrooms.
The number of occupants.
Whether showers will be used simultaneously.
Whether additional bathrooms are planned.
The expected hot-water flow from the proposed boiler.

A larger combi boiler cannot correct a restricted incoming water main.

Where several bathrooms are used together, a system boiler and hot-water cylinder may provide a better result.

Correct Boiler Sizing

The size of the boiler should not be based on the number of bedrooms alone.

The heating assessment should consider:

Property size.
Wall construction.
Roof and floor insulation.
Window sizes and glazing.
Air leakage and draughts.
Number and size of radiators.
Underfloor heating.
Extensions and loft conversions.
Hot-water demand.
Planned home improvements.

Two three-bedroom homes can require very different amounts of heat.

A compact modern flat may need considerably less output than a large Victorian property with solid walls, high ceilings and an extension.

An oversized boiler is not automatically better. It may frequently cycle on and off when the heating demand is low.

An undersized boiler may struggle to heat the property or produce sufficient hot water.

The selected appliance should meet the maximum demand while also being capable of reducing its output when the property needs less heat.

Heating and Hot-Water Design

The installer should assess heating and hot-water requirements separately.

A combi boiler may need a relatively high output to provide hot water even where the home requires much less output for its radiators.

A system or regular boiler must be matched to a suitable hot-water cylinder.

The assessment should consider:

Number of bathrooms.
Number of occupants.
Shower performance.
Bath sizes.
Simultaneous use.
Cylinder size.
Cylinder recovery time.
Incoming water pressure.
Incoming water flow.
Distance between the boiler, cylinder and outlets.

Installing a powerful boiler with an undersized cylinder will not create satisfactory hot-water performance.

The boiler, cylinder, radiators and controls must be designed as a coordinated system.

New Boiler Installation During Home Improvements

A house extension, loft conversion or refurbishment is often the ideal time to review the boiler and heating system.

The completed property may have:

More floor space.
Additional radiators.
Extra bathrooms.
Underfloor heating.
Improved insulation.
New windows.
A different internal layout.
A larger kitchen and family area.

The existing boiler may not have been selected for these new requirements.

Carrying out the boiler installation while floors and walls are already open can also make it easier to:

Renew heating pipes.
Relocate the boiler.
Install heating zones.
Add underfloor heating.
Conceal new services.
Remove tanks and cylinders.
Create a new utility or plant room.

The heating system should be designed around the completed building rather than the property before the improvements.

The APN network is supported by more than 40 years of experience in homes, design, heating layouts and property improvement. This property-led approach helps ensure the boiler works with the wider project rather than being treated as a last-minute purchase.

New Boiler Installation Cost

The new boiler installation cost depends on the existing system, boiler type, installation location and amount of additional work required.

Published manufacturer guidance places many installations within the following broad ranges:

Combi-to-combi installation: approximately £1,200 to £3,500.
Combi-to-system installation: approximately £1,200 to £4,000.
System-to-system installation: approximately £1,250 to £4,000.
Regular-to-regular installation: approximately £2,500 to £4,500.
Regular-to-combi installation: approximately £2,500 to £4,500.

These figures are general guides rather than fixed prices.

A straightforward boiler replacement in the same position may cost less than a project involving boiler relocation, tank removal, cylinder replacement and major pipework alterations.

A completely new heating system will normally cost more because it may include:

New radiators.
New heating pipework.
A new gas supply.
A hot-water cylinder.
Electrical work.
Floor and wall alterations.
Multiple heating zones.
Underfloor heating.
Extensive making good.

The boiler appliance price should not be confused with the total installed cost.

What Can Increase the Installation Cost?

Moving the Boiler

Relocating a boiler may require new:

Gas pipes.
Heating pipes.
Water pipes.
Electrical supplies.
Flue components.
Condensate drainage.

Changing the System Type

Converting from a traditional system to a combi may require the removal of tanks, a cylinder, pumps and redundant pipework.

Changing from a combi to a cylinder system requires space for the cylinder and additional heating controls.

Gas-Pipe Upgrades

A higher-output boiler may require a larger gas supply pipe.

The installer must consider the distance from the gas meter, pipe diameter, bends and other gas appliances.

Flue Work

A complicated flue route, vertical flue or plume-management system can increase the cost.

System Cleaning

A heavily contaminated heating system may require more extensive cleaning or individual radiator flushing.

Radiators and Controls

The price may rise if radiators, valves, pumps, thermostats or heating controls need replacing.

Building and Electrical Work

Kitchen cupboards, wall finishes, floors, wiring and drainage may all require alteration.

These items should be identified during the initial survey rather than added unexpectedly after the installation begins.

What Should Be Included in the Quote?

A proper new boiler quotation should identify:

Boiler manufacturer and model.
Boiler output.
Manufacturer’s warranty.
Boiler location.
Boiler controls.
Flue arrangement.
Condensate drainage.
Gas-pipe work.
Heating-pipe alterations.
Hot-water alterations.
Cylinder or tank work.
Electrical work.
System cleaning.
Magnetic filter.
Chemical inhibitor.
Radiator or valve work.
Removal of the old boiler.
Waste disposal.
Commissioning.
Warranty registration.
Building Regulations notification.
Making good.
VAT.
Payment terms.
Exclusions.

Avoid relying on a quotation that simply states “supply and install new boiler.”

Two quotations may use the same boiler but include very different levels of system preparation, controls and certification.

Boiler Position

Keeping the boiler in the same location will normally reduce cost and disruption.

However, relocation may improve the home by:

Releasing a kitchen cupboard.
Creating more worktop space.
Moving the boiler into a utility room.
Reducing noise near a bedroom.
Improving servicing access.
Creating a better flue route.
Supporting a new kitchen layout.

Possible boiler locations include:

Kitchens.
Utility rooms.
Airing cupboards.
Garages.
Suitable loft spaces.
Purpose-designed boiler cupboards.

The position must allow safe access for servicing and provide suitable routes for the gas pipe, heating pipes, electrical supply, flue and condensate drain.

The final location should be agreed before the boiler is purchased.

Flue and Condensate Drainage

A modern condensing boiler needs a correctly positioned flue and a suitable condensate drain.

The flue position should be considered in relation to:

Windows.
Doors.
Air vents.
Boundaries.
Neighbouring properties.
Patios and walkways.
Roof openings.
Conservatories.
Future extensions.

Modern boilers may create a visible water-vapour plume during cold weather. The flue should therefore be positioned to avoid nuisance and staining.

Condensate should discharge to a suitable drain.

Long external condensate pipes should be avoided where possible because they can freeze during very cold weather and cause the boiler to stop operating.

Cleaning the Existing Heating System

A new boiler should not be connected to dirty heating water without proper preparation.

Older systems may contain:

Rust.
Black iron oxide sludge.
Scale.
Flux residue.
Installation debris.

Signs of contamination include:

Radiators cold at the bottom.
Dark water when radiators are drained.
Noisy pumps.
Slow circulation.
Uneven heating.
Repeated component failure.

The installer should recommend an appropriate cleaning method.

This may include chemical cleaning, radiator flushing, installation of a magnetic filter and the addition of corrosion inhibitor.

The system should then be filled, tested and balanced so the new boiler can circulate water effectively.

Modern Heating Controls

A new boiler installation provides an opportunity to improve the heating controls.

A practical system may include:

A programmer or timer.
A room thermostat.
Thermostatic radiator valves.
Smart mobile controls.
Multiple heating periods.
Individual room control.
Weather compensation.
Load compensation.
Holiday settings.

Energy Saving Trust recommends using programmers, room thermostats and thermostatic radiator valves effectively and identifies smart controls as an additional way to manage heating.

Smart controls are not compulsory.

A straightforward timer and room thermostat can still provide effective control where the budget is limited. The important point is that the controls should be compatible with the boiler and easy for the household to use.

New Boiler Installation Near Me

A homeowner searching for new boiler installation near me needs more than the closest available plumber.

The installer should understand:

Boiler and system design.
Heating requirements.
Hot-water demand.
Boiler sizing.
Water pressure and flow.
Gas-pipe sizing.
Radiator performance.
Flue positioning.
Condensate drainage.
System cleaning.
Heating controls.
Commissioning and certification.

A local installer may provide easier surveys, reduced travelling costs, faster follow-up and more convenient annual servicing.

However, location should not be the only deciding factor.

Compare:

Gas Safe registration.
Relevant qualifications.
Written specifications.
Boiler recommendations.
Warranty terms.
System-cleaning methods.
Controls.
Aftercare.
Total installed price.

The official Gas Safe Register allows homeowners to search for registered engineers and check the categories of work they are qualified to undertake.

Gas Safe Installation and Certification

Gas work must be completed by a suitably qualified Gas Safe registered engineer.

The homeowner should check the engineer’s identification card, including:

Photograph.
Name.
Registration number.
Expiry date.
Relevant appliance categories.

A properly completed installation should include:

Testing the gas supply.
Installing the boiler and flue.
Checking the condensate arrangement.
Cleaning and treating the system.
Testing heating circulation.
Checking combustion.
Commissioning the boiler.
Setting the controls.
Balancing the radiators.
Registering the warranty.
Completing the required notification.
Explaining the system to the homeowner.

In England and Wales, a Gas Safe registered business can normally notify qualifying boiler installation work through the competent-person process. The resulting Building Regulations certificate provides evidence that the work has been notified and may be important when the property is sold.

The homeowner should retain the certificate, commissioning documents, boiler instructions, warranty confirmation and final invoice.

Questions to Ask Before Accepting a Quote

Before arranging a new boiler installation, ask:

Why have you recommended this boiler?
How was the boiler output selected?
Is the proposed boiler suitable for our hot-water demand?
Has the water pressure and flow been tested?
Is the existing gas supply pipe suitable?
Can any existing radiators or pipework be retained?
Does the boiler need to remain in the same position?
What controls are included?
How will the heating system be cleaned?
Is a magnetic filter included?
What warranty will we receive?
Who will register the warranty?
Is Building Regulations notification included?
Is removal of old equipment included?
What could increase the final cost?

An experienced installer should answer these questions clearly and explain the proposed system before work begins.

New Boiler Installation Through APN Boilers

APN Boilers helps homeowners find experienced professionals for new boiler installation, boiler replacement and complete central-heating projects throughout the UK.

Our approach considers:

The size and construction of the home.
Heating requirements.
Hot-water demand.
Boiler type and output.
Incoming water pressure and flow.
Gas-supply capacity.
Radiators and heating pipework.
Boiler position.
Flue and condensate routes.
Heating controls.
Future extensions and bathrooms.
Installation costs.
The homeowner’s budget.

Whether you need a straightforward boiler replacement, a new combi boiler installation or an entirely new heating system, the work should begin with a proper assessment.

A well-designed installation can provide dependable heating, reliable hot water and better control for many years.

Tell APN Boilers about your property, existing heating and what you need the new system to achieve. We will help connect you with an experienced heating professional who can assess the home and recommend the right new boiler installation.

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