New Boiler Cost 2026: What Homeowners in Sussex and Surrey Should Really Expect to Pay

36+ years. 1,000+ installations. Gas Safe registered.

If you are searching for the real new boiler cost in 2026, you probably want one thing: a straight answer.

A typical new boiler installation for a homeowner in Sussex or Surrey costs between £2,000 and £4,500, depending on the boiler type, brand and work involved.

A simple combi-to-combi replacement may cost around £2,000–£3,200. A more involved conversion, relocation or system upgrade can reach £3,500–£5,000 or more.

These are realistic guide prices. Not a sales gimmick. Not a headline price that leaves out the important parts.

At Boilers On-Demand, we have served homeowners across East Sussex, West Sussex and Surrey since 1988. We are not a national call centre. We are a local team that gives clear advice, installs properly and leaves your home warm, safe and tidy.

New Boiler Cost in Sussex and Surrey: 2026 Guide Prices

The following figures are typical installed ranges for a standard domestic property. They usually include the boiler, standard materials, labour and commissioning. Your final price depends on the survey.

Our East Sussex installation service has selected installations available from £1,699, but the lowest advertised price will not suit every home. A proper quote should be based on your existing system, hot water requirements, pipework and flue position.

How Much Does a Combi Boiler Cost?

A combi boiler heats your radiators and hot water directly from the mains. There is no separate hot water cylinder or cold-water tank.

For many flats, smaller homes and households with one bathroom, a combi is the simplest and most cost-effective option.

In 2026, a standard combi replacement generally costs:

• £2,000–£3,200 for a straightforward same-location swap.
• £3,200–£4,500+ where pipework, controls or the flue need substantial changes.
• £3,500–£5,000+ if you are converting from a regular or system boiler.

Most like-for-like combi replacements can be completed in a single day. That helps keep labour costs under control and reduces the time your home is without heating and hot water.

System Boiler Cost

A system boiler works with a hot water cylinder. It is often a good choice for larger households with two or more bathrooms, where several people may need hot water at the same time.

A system boiler installation typically costs £2,500–£4,500 in 2026.

The price can increase if:

• The hot water cylinder also needs replacing.
• The cylinder needs to be moved.
• The existing controls are outdated.
• Pipework needs upgrading.
• The heating system needs cleaning or balancing.
• Additional radiators or smart controls are included.

A system boiler may cost more than a combi, but it can deliver better hot water performance for a busy household. Choosing the cheapest boiler type is not always the cheapest solution in the long term.

Regular or Heat-Only Boiler Cost

Regular boilers, also called heat-only boilers, are common in older Sussex and Surrey homes. They normally work with a hot water cylinder and a cold-water storage tank, often located in the loft.

A regular boiler replacement usually costs £2,300–£4,000.

A like-for-like replacement is generally more straightforward. However, if the tanks, cylinder, controls or older pipework also require work, the total price will rise.

For some properties, especially homes with an older radiator system or lower mains water pressure, keeping a regular boiler is the right decision. We do not recommend changing boiler type simply because it is newer. We look at how your home actually uses heating and hot water.

What Affects the Final New Boiler Cost?

1. The Boiler Brand

We install established brands including Vaillant, Glow-worm and Baxi.

As a general guide:

• Glow-worm: Often positioned at the more affordable end of the market.
• Baxi: A popular mid-range option with a broad selection of models.
• Vaillant: A premium choice with strong efficiency, controls and warranty options.

The brand affects the boiler price, but it is not the only factor. The correct output, the quality of installation and the suitability of the system matter just as much.

A cheaper boiler installed badly is not a saving. It is a future problem.

2. Boiler Size and Output

Boilers are measured by output in kilowatts, or kW. A larger home does not automatically need the biggest boiler available.

The right size depends on:

• The number of radiators.
• The size and insulation of your home.
• How many bathrooms you have.
• Your hot water demand.
• The incoming mains water pressure.
• Whether you are replacing a combi, system or regular boiler.

An oversized boiler can cost more to buy and may operate less efficiently. An undersized boiler may struggle to heat your home and provide enough hot water.

We assess the property before recommending a model. That protects you from paying for capacity you do not need, or ending up with a system that cannot keep up.

3. Boiler Location

Keeping the new boiler in the same position is usually the least expensive option.

Moving it to a different room, cupboard, loft or external wall can add £800–£1,200 or more. The extra cost may cover:

• New gas and water pipework.
• Additional heating pipework.
• Electrical work.
• Flue repositioning.
• Condensate drainage.
• Building work or boxing-in.
• Additional time for testing and commissioning.

A boiler relocation can make sense if your existing boiler is in an inconvenient position. But it should be priced as a full project, not treated as a simple replacement.

4. Flue Position and Flue Upgrades

The flue removes combustion gases from the boiler. Its route and termination point must be safe and compliant.

Your existing flue may need to be changed if:

• The new boiler has different flue requirements.
• The boiler is moved.
• The flue exits too close to a window, door or boundary.
• The existing flue is damaged or unsuitable.
• Access for inspection is poor.

Flue work can be a small additional cost or a major part of the installation, depending on the property. This is one reason a proper survey matters.

5. The Condition of Your Existing System

Old heating systems can contain sludge and corrosion. This can restrict circulation and damage a new boiler.

Your quote may include or recommend:

• A system clean or power flush.
• A magnetic filter.
• New isolation valves.
• Replacement pipework.
• New radiators.
• A smart thermostat or upgraded heating controls.

These are not always unnecessary extras. They may help protect the new boiler, improve efficiency and keep your manufacturer guarantee valid.

Does Removing the Old Boiler Cost Extra?

In many standard installation quotes, removal and disposal of the old boiler are included in the labour price.

At Boilers On-Demand, we remove the old boiler as standard as part of the installation. We also dispose of it responsibly.

Ask any installer to confirm this in writing. Some companies advertise a low boiler price and then add separate charges for removal, disposal or commissioning.

The same applies to filters, controls, flue work and VAT. A clear quote should show what is included and what is not.

How Much Is Boiler Labour and Installation?

For a gas boiler replacement, labour and standard installation materials commonly account for around £600–£1,700 of the total price.

The range is wide because installation time varies:

• A straightforward combi swap may take one working day.
• A boiler relocation may take longer.
• A system-to-combi conversion may take one-and-a-half to two days.
• Older properties may require additional pipework or remedial work.

We aim to complete suitable installations within a single day. We arrive when agreed, protect your home, work cleanly and explain the controls before leaving.

Why Gas Safe Registration Matters

Gas work is not a job for an unqualified installer.

The Gas Safe Register is the official register of businesses and engineers legally permitted to work on gas appliances in Great Britain. The Health and Safety Executive also confirms that gas boiler installation and checks must be carried out by a suitably qualified Gas Safe registered engineer.

Boilers On-Demand is Gas Safe registered under No. 575142.

You should always ask to see the engineer’s ID card and check that they are qualified to work on domestic boilers. A small saving is not worth risking your family’s safety, your property or your boiler warranty.

Can You Spread the Cost of a New Boiler?

Yes. Flexible finance can help if a boiler breakdown has arrived at the worst possible time.

Finance may allow you to spread the cost into manageable monthly payments rather than paying the full amount upfront. It means cost does not have to stand between you and a properly working heating system.

Finance is subject to status and credit checks. Coventry Plumbing Ltd is an Introducer Appointed Representative of Phoenix Financial Consultants Limited, which is a credit broker, not a lender.

We will explain the available options clearly. No pressure.

What Guarantee Comes With a New Boiler?

Depending on the model and installation terms, we offer manufacturer guarantees of up to 12 years on selected boilers.

A guarantee is only valuable when the boiler is correctly installed, registered and serviced in line with the manufacturer’s requirements. Always check:

• The exact guarantee length for the model quoted.
• What parts and labour are covered.
• Whether annual servicing is required.
• Whether filters or controls are conditions of the guarantee.
• Who you contact if something goes wrong.

Our promise is simple: we install properly, explain everything clearly and remain available after the installation.

Frequently Asked Questions

How much does a new boiler cost in Sussex and Surrey in 2026?

A typical new boiler installation costs between £2,000 and £4,500 depending on the boiler type, brand, and work involved. A simple combi-to-combi replacement is usually £2,000–£3,200, while a conversion, relocation, or system upgrade can reach £3,500–£5,000 or more. Selected East Sussex installations are available from £1,699.

How much does a combi boiler cost to install?

In 2026, a standard combi replacement generally costs £2,000–£3,200 for a straightforward same-location swap, £3,200–£4,500+ where pipework, controls, or the flue need substantial changes, and £3,500–£5,000+ if you are converting from a regular or system boiler.

Does removing the old boiler cost extra?

Not with us. At Boilers On-Demand we remove and responsibly dispose of your old boiler as standard, as part of the installation. Always ask any installer to confirm removal, disposal, and commissioning are included in writing.

Can I spread the cost of a new boiler?

Yes. Flexible finance can spread the cost into manageable monthly payments rather than paying upfront. Finance is subject to status and credit checks. Coventry Plumbing Ltd is an Introducer Appointed Representative of Phoenix Financial Consultants Limited, a credit broker, not a lender.

What guarantee comes with a new boiler?

Depending on the model and installation terms, we offer manufacturer guarantees of up to 12 years on selected boilers. A guarantee is only valid when the boiler is correctly installed, registered, and serviced in line with the manufacturer’s requirements.

Why Choose Boilers On-Demand?

36+ years. 1,000+ boilers. One local team.

We serve homeowners across East Sussex, West Sussex and Surrey, including Eastbourne, Brighton, Hastings, Lewes, Bexhill-on-Sea, Uckfield, Hailsham, Seaford, Horsham, Billingshurst, Petworth, Steyning and surrounding communities.

Choose us because:

• We are local, not a faceless national contractor.
• We are Gas Safe registered, No. 575142.
• We install Vaillant, Glow-worm and Baxi boilers.
• Most straightforward installations are completed in one day.
• Old boilers are removed as standard.
• Finance options are available.
• Manufacturer guarantees of up to 12 years are available on selected models.
• We give clear quotes before work begins.

Get a Clear New Boiler Cost for Your Home

Online price guides can give you a useful starting point. They cannot see your pipework, flue, cylinder, loft tank or radiator system.

For an accurate price, request a free boiler survey and quote. We will assess your home, explain the options and show you exactly what is included.

Call 01903 802395 or request a quote online.

No hard sell. Just a straight conversation.