New Boiler Costs: How Much is a New Boiler? (July 2025)

System boilers work alongside a hot water cylinder, keeping a constant supply of hot water in store for use. This makes a system boiler most suitable for medium-to-large homes, with more than 2 bathrooms, as it can serve multiple outlets at once.

Gas system boiler costs start at £600, with oil system boilers reaching up to £3,000. The main consideration with this boiler type is the storage of the additional cylinder. It can be quite large, depending on how many litres you need, and will usually need a dedicated storage area (like a full-length cupboard or utility room).

If you’re looking for a highly efficient boiler that can provide instant hot water for multiple taps and baths, then a system boiler is the perfect choice. However, if you’re low on storage space, consider the more cost-effective combi with a higher output.

However, if you currently have a conventional boiler, you may want to consider your options more thoroughly.

Conventional boilers (also known as ‘regular’ or ‘heat-only’) are the oldest style of boiler, typically found in older homes and buildings. Out of all boiler types, these require the most space and installing one is only advised as a replacement if you already have one. 

This is because a conventional boiler requires a hot water cylinder and a cold water feed tank (in the loft), which are expensive and time-consuming to install. Whilst they are good for homes with 2 or more bathrooms, system boilers are usually favoured over conventional boiler types, as they offer similar benefits, without the complex installation.

Prices for a new conventional boiler start at £600, with average costs for full installation around £3,550.

For homes with existing conventional boilers, upgrading to a new conventional model can be worthwhile, as it may be more efficient. However, most homes prefer to switch to a smaller system boiler to regain space in their loft.

There are a number of installation considerations with this boiler type, as complex fittings and additional elements can quickly add to your overall cost. To make the best decision, based on the size of your home and your hot water needs, you should seek advice from a qualified installer.

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Gas boilers, fueled by natural gas from the National Grid, are one of the most popular heating solutions in the UK. This is due to the widespread availability of gas connections, simpler installation, and historically lower fuel costs compared to other fuel options.

While the units themselves range from £600 - £3,300, installation costs can add a substantial amount to your overall expense. Complex installations requiring work for fuel type changes or outstanding repairs can incur additional charges of up to £2,000. It’s crucial to factor in both the cost of the boiler unit and potential installation fees by a Gas Safe registered engineer when budgeting for a new system.

As most UK homes have a direct gas connection, a gas boiler can be the simplest, quickest and therefore cheapest option to install. Gas boilers are also widely available in each boiler type, from most manufacturers, giving you the greatest range of choice.

However, if you live in a more rural location, without a gas connection, you will need to consider the following alternatives.

Oil boilers work by burning a specialised heating oil - typically kerosene. These boilers are a popular choice for homes not connected to the national gas grid. While their functionality is similar to gas boilers, a key difference lies in fuel delivery: oil requires storage in a tank that needs periodic refilling, unlike the continuous supply of gas from the grid. 

The price of an oil boiler unit ranges from around £1,300 - £4,000, varying based on factors such as boiler size, manufacturer, and installation complexity. When factoring in installation costs, the total price for a new oil boiler can range between £2,300 - £6,000 .

For homes living off-grid, oil boilers offer a comparative alternative to gas boilers, as oil is typically the lowest-cost fuel after gas. There are some serious considerations, however, as oil must be carefully stored and will need adequate storage space on your property. You will also need to manually order supplies and ensure you don’t run out.

Unfortunately, oil boilers are amongst the most expensive to purchase (due to their complex build and production). Fortunately, there is another option for off-grid homes, if you wish to consider an all-electric boiler.

In terms of new boiler prices, those of electric boilers are comparable to those of standard combi boilers. They are a highly efficient option for homes without a connection to the gas grid, as the best electric boilers on the market have efficiency ratings close to 100%. 

However, homes with solar panels can supply an electric boiler with free, sustainable energy and dramatically reduce their home energy bills. That said, it’s important to note that as a fuel type, electricity is 4 times more expensive than natural gas, which may significantly impact your energy bills in the long run. So, be sure to consider this before getting an electric combi boiler.

For homes off-grid, with solar panels, an electric boiler is the perfect choice. This allows you to heat your home with renewable energy at minimal cost.

However, if you rely on the grid for power, running an electric boiler can be very expensive, particularly compared to other fuel options (E.g. gas is approximately 6 pence/kWh, whereas electricity is around 27 pence/kWh).

It’s important to carefully weigh up your options to find a boiler that not only gives you the heating output you need, but that also suits your finances long-term. To find out how much it will cost to install a new boiler, you should speak to a qualified installer.

It can be a daunting task finding someone you can trust. Fortunately, the days of endlessly surfing the web and scheduling calls are gone with GreenMatch’s free quote service.

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While a like-for-like boiler replacement is often the most budget-friendly choice, converting to a different boiler type might sometimes better suit your needs. However, there are some key costs to keep in mind.

Converting your boiler type can add up to £1,400 to your total costs. For example, switching from an old conventional boiler to a new system boiler involves additional work, such as removing old pipework, tanks from the loft and fitting new parts, like a new cylinder. Costs for complex conversions like this can be between £2,525 - £7,425 (including the new boiler and labour rates).

Switching from a system to a combi will still add costs to your installation, but as this is more straightforward (the only additional step is to remove the old cylinder)  it can cost between £1,550 - £5,650.

Prices for conversions largely depend not only on the type of boiler you switch to, but also on the fuel type, brand and age of your system. These factors can impact the complexitiy and number of parts you need. Here's a breakdown of estimated prices for common boiler conversions:

There are multiple factors that impact the average price of a new boiler. These include: 

With so many factors to consider, choosing a new boiler for your home might feel like a daunting task. Consulting a qualified installer will ensure you secure a boiler option that is tailored to your situation. However, searching for a trustworthy installer can drag on for days (if not weeks) if done alone!

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The best boiler brands offer competitive new boiler costs, but there are some key variances between them that are worth considering. These include the additional features that come with the boiler, the brand’s reputation, and the overall quality of the model.

We’ll explore these differences in detail below, but have outlined each manufacturer’s boiler prices in this table as an overview:

While Worcester Bosch and Viessmann might seem like the most expensive choices, these brands are well regarded for their long-lasting materials (such as stainless steel heat exchangers) and lengthy warranty offers of up to 12 years. In addition, both have received consumer and industry awards, such as Which? Best Buy for Worcester boilers and international awards for design and innovation for the Viessmann Vitodens 300 boiler range.

Ideal and Vaillant are also award-winning brands for something more affordable that still offers outstanding performance. Ideal has won two Queen’s Awards for Enterprise and one for Innovation for its Logic range. Vaillant also boasts Which? Best Buy awards, alongside numerous sustainability awards for both its products and its manufacturing processes.

For more accessible brands, Alpha and Baxi offer the most affordable boilers while still offering high-quality, installer-backed products. These brands might seem like budget options, but they compete well in terms of warranty offers (up to 10 years) and have great customer reviews - Baxi scores 4.6/5 on Trustpilot, and Alpha scores 4.7.

To ensure you find the right boiler for your budget, you should compare quotes from several installers. Finding it hard to make time for endless calls and research? That’s no problem! We’ll do it for you.

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