How Much Does a New Boiler Cost?

According to Checkatrade, you can expect the total cost of a new boiler installation to fall somewhere between £3,000 and £15,000 (including installation). The reason that there's such a broad range comes down to the number of factors that can influence your final price.

Firstly, the type of boiler you choose plays one of the biggest roles in cost. Combi boilers are usually the most affordable option since they don’t require separate water tanks or cylinders, while system and regular boilers tend to be more expensive to buy and install due to their additional components.

Your chosen brand also makes a difference. Premium names come with higher upfront costs but often offer better efficiency, reliability and longer warranties.

While there are several other factors that can affect the cost of your new boiler (which we’ll cover next), the best way to get an accurate idea of your total price is to contact your chosen installer directly, such as Glow Green, and request a free, no-obligation quote.

Boiler Types and Prices

Each type of boiler, from compact combis to regular boilers, comes with its own benefits, drawbacks and of course, costs. The table below gives you a quick overview of the main boiler types you'll come across, what they typically cost, and the pros and cons of each:

Prices shown are for the boiler unit only and do not include installation. Actual costs can vary depending on the brand, model and supplier.

Once again, for the most accurate idea of what your new boiler will cost, we recommend requesting a boiler quote from us here at Glow Green.

Combination (Combi) Boiler Cost

Prices shown are for the boiler unit only and do not include installation. Actual costs can vary depending on the brand, model, and supplier.

A combination boiler (or combi boiler) is one of the most popular boiler types in the UK thanks to its convenience and efficiency. It provides heating and hot water directly from the mains, making it ideal for homes where space is limited. Since it doesn’t require a water tank or cylinder, installation is usually faster and cheaper than other types.

In 2026, a new combi boiler typically costs between £345 and £3,500 depending on the make, model and performance level. Premium brands such as Worcester Bosch generally sit at the higher end of this range, while budget-friendly models are available for smaller households or tighter budgets.

Conventional (Regular) Boiler Cost

Prices shown are for the boiler unit only and do not include installation. Actual costs can vary depending on the brand, model and supplier.

A conventional boiler, sometimes called a regular or heat-only boiler, is a great choice if your home already has a traditional heating system with a hot water cylinder and cold water tanks. These boilers can handle high hot water demand across several taps or showers at once, which makes them popular in larger properties and family homes.

Nowadays, you can expect to pay between £600 and £2,000 for a new conventional boiler, depending on the brand, efficiency rating and size.

It's important to keep in mind that while regular boilers provide steady performance, they do take up more room and require more complex installation compared to combi or system options.

System Boiler Cost

Prices shown are for the boiler unit only and do not include installation. Actual costs can vary depending on the brand, model and supplier.

A system boiler bridges the gap between combi and conventional boilers, offering a balance of performance and practicality. It stores hot water in a cylinder so you can run multiple taps or showers at once without losing pressure, ideal for growing families or properties with two or more bathrooms.

One of the main advantages of a system boiler is its smooth, reliable water flow and ability to integrate with renewable heating setups, like solar panels. However, you’ll need room for the hot water cylinder, and because there’s no instant heating on demand, you’ll have to wait for the stored water to reheat if it runs out.

Gas Boiler Cost

Prices shown are for the boiler unit only and do not include installation. Actual costs can vary depending on the brand, model and supplier.

A gas boiler remains the most common type of heating system in UK homes. It’s reliable, easy to source and delivers cost-effective heating for households connected to the mains gas network. Modern gas boilers are highly efficient, with most new models being A-rated for energy use, meaning they can help reduce both your bills and your household emissions.

In 2026, the average cost of a new gas boiler ranges from £600 to £3,500, depending on factors such as size, brand and whether you choose a combi, system or conventional setup.

Although gas boilers remain a popular and affordable choice, it’s worth keeping long-term energy plans in mind. The UK is moving toward low-carbon heating solutions, with future regulations likely to favour greener alternatives such as heat pumps or hydrogen-ready systems. If you’re upgrading your boiler now, choosing one that’s future-proof or hydrogen-ready could be a smart move.

Electric Boiler Cost

Prices shown are for the boiler unit only and do not include installation. Actual costs can vary depending on the brand, model and supplier.

An electric boiler can be a great choice if your home isn’t connected to the gas grid or if you want a cleaner, more environmentally friendly way to heat your property. Since it runs entirely on electricity, it doesn’t release any carbon emissions on-site, making it an attractive option for people looking to cut their environmental impact.

One of the main advantages of an electric boiler is its simplicity. There’s no need for a flue, gas supply or regular safety checks, and installation tends to be straightforward. They’re also extremely quiet when running and require very little maintenance compared to gas systems.

The main drawback is the cost of electricity, which can make these boilers more expensive to run day to day. They also tend to have a lower output capacity, so while they’re excellent for small properties or secondary heating, they may struggle to meet the demands of larger households with multiple bathrooms.

Still, as the UK transitions toward renewable power, electric boilers are becoming increasingly attractive, especially for energy-efficient homes that generate their own electricity through solar panels or benefit from an off-peak electricity tariff.

Factors That Affect Boiler Prices

As mentioned above, when it comes to buying a new boiler, the price can differ greatly from one home to another. Even if two people choose the same brand, the total cost may vary depending on the the type of boiler chosen and your home’s specific heating needs.

Understanding what drives those differences can help you budget more accurately:

• Type of boiler - Combi boilers are usually the most affordable since they heat water directly from the mains, while system and regular (conventional) boilers typically cost more because they need extra components like water tanks or cylinders.

• Boiler brand and model - Premium manufacturers such as Worcester Bosch and Vaillant (both sold by Glow Green) tend to charge higher prices for their advanced technology and longer warranties, whereas budget brands offer simpler models at lower upfront costs.

• Boiler size and output (kW rating) - The larger your home and the more bathrooms you have, the more powerful your boiler needs to be. Higher-output models generally come at a higher price.

• Installation complexity - Replacing an old boiler with a new one in the same location is cheaper and quicker than moving it elsewhere in your home. Extra pipework, flue changes or new controls can all increase labour costs.

• Property size and heating demand - A small flat will need a smaller, less powerful boiler compared to a large detached house. Bigger properties often require higher-capacity boilers and more complex installations.

• Regional labour costs - Prices can vary across the UK depending on where you live. Installations in London and the South East usually cost more than in other parts of the country.

• Additional features and extras - Optional upgrades such as smart thermostats, magnetic system filters or a full system power flush can improve efficiency but will add to your total cost.

• Energy efficiency and performance - Investing in a more efficient boiler may cost more upfront but can help you save money long-term through lower energy bills.

Additional Costs When Buying a New Boiler

It's important to remember that there are often a few extra costs to consider when replacing your boiler. These additional expenses can depend on your home’s current setup, the type of boiler you choose and any upgrades you decide to include.

Considering these costs from the outset will give you a clearer picture of your total investment and help you know exactly what to discuss with your installer when requesting a quote.

• Installation costs - Labour can make up a significant part of the total price, especially if your installation involves moving the boiler, upgrading pipework or adding new fittings.

• Flue and extensions - A new flue system is usually required when replacing an old boiler. The cost may increase if extensions are needed to vent it safely.

• System power flush - Before fitting a new boiler, your heating system may need a power flush to remove built-up sludge and debris. This helps protect your new system and improve efficiency.

• Smart thermostat or new controls - Upgrading to modern, programmable controls or a smart thermostat like Hive or Nest can improve comfort and energy savings but comes at an added cost.

• Chemical inhibitors and filters - Many installers add corrosion inhibitors or magnetic filters to protect your heating system. These are small extras that help extend your boiler’s lifespan.

• Pipework adjustments - If your current pipework doesn’t meet modern standards or if you’re switching boiler types, some sections may need to be replaced or upgraded.

• Building or electrical work - In some cases, you may need minor building work to prepare the space for your boiler or electrical upgrades to ensure everything meets safety standards.

• Removal of old boiler and waste - Disposing of your old boiler and any waste materials is sometimes included in the quote, but not always, so it’s worth checking in advance.

Boiler Replacement Grants

Boiler replacement grants can help you cut the upfront cost of moving away from a traditional gas or oil boiler and switching to a low‑carbon heating system.

In most cases, you do not apply for these grants yourself. Instead, you work with an approved installer, such as Glow Green, who handles the application on your behalf and takes the value of the grant off your quote.

Boiler Upgrade Scheme (BUS)

The Boiler Upgrade Scheme is the main government grant that helps you replace a fossil fuel boiler with a low‑carbon system such as a heat pump or, in some cases, a biomass boiler. It is available for homes and small non‑domestic buildings in England and Wales, and is designed to support the UK’s move towards cleaner heating by reducing the upfront cost of these technologies.

Through the scheme, you can get a fixed amount of money taken off the cost and installation of an eligible system. A typical grant covers up to £7,500 towards an air source or ground source heat pump, and £5,000 towards a biomass boiler, although exact amounts can change as the scheme is updated over time.

To benefit from the Boiler Upgrade Scheme, you must usually own the property and be replacing an existing fossil‑fuel heating system, such as a gas, oil, LPG or direct electric boiler. The scheme covers most types of homes and many small business premises, but new‑build properties are more restricted, and social housing is generally excluded.

Your chosen installer, such as Glow Green, will also need to be properly accredited and confirm that your home is technically suitable for the system you want.

If you're not looking to replace your boiler with a heat pump, you can instead speak to Glow Green, one of the UK’s best boiler installers, who can provide a competitive boiler quote and talk you through any questions you have.

New Boiler Cost FAQs