New Boiler Costs: How Much is a New Boiler? March 2025

System boilers cost between £600 and £3,000, excluding installation. These boilers are straightforward to install, with just one unit and a separate hot water cylinder. They offer large quantities of hot water, making them the perfect alternative to conventional and combi boilers if you are low on space but have high hot water demands.

System units are considered the best boiler for a 4 bedroom house as they can serve multiple bathrooms at once. If you're unsure which boiler is best for you, check out our comparison guide: combi boiler vs system boiler. We’ve listed some system boiler costs below to help you decide.

When considering a new boiler replacement, one of the biggest cost factors will be the fuel type you choose. We’ve covered the main options in more detail below with some estimates of how much each boiler costs per fuel.

A gas boiler will cost you between £1,600 and £6,000, including installation fees. Natural gas is the most popular fuel option in the UK, mainly because nearly all households are connected to the national gas grid. 

Gas has also typically been the cheapest fuel source, making it the most common and, therefore, affordable option. Keep in mind, however, that while a cheap boiler is enticing, you need to ensure you choose quality and reliability over just price alone. 

We’ve included some cost estimates below for gas boilers.

Oil boilers cost between £2,300 and £6,000 to install. Despite their higher costs, oil boilers are a great alternative for households not connected to the gas grid or those in more rural areas. They can offer similar running costs to gas (for example, oil is 6.8 pence per unit, while gas is 6.34 pence). 

The biggest consideration with an oil boiler, however, is that it requires adequate space on a property to store a large oil supply tank. This can be stored outside or buried in a garden, but it is crucial that the supply is kept topped up so you don’t risk being without a boiler! 

Here are some typical market price estimates:

An electric boiler will cost you £1,600 to £5,000 including installation. These boilers are another great option for those off the grid or those looking for an alternative to fossil fuels. They are a highly efficient option, as they convert 100% of the energy they consume into usable heat.

While electricity prices can make this option seem far more expensive to run, electric boilers are a great option for homes with solar panels as they can be run on free, renewable energy. 

You can get a deeper look into the topic from our electric boiler vs gas boiler comparison page. Meanwhile, we’ve listed some price estimates below:

Biomass boilers typically cost between £9,000 and £20,000, with installation costs included. They burn organic fuels such as wood pellets or logs to generate heat which is then transferred to a property central heating system through a heat exchanger. 

Biomass boilers are best suited for larger properties, particularly those in rural or off-grid areas without access to mains gas. They offer a low-carbon alternative to fossil fuel boilers, and installations are therefore eligible for funding through the Boiler Upgrade Scheme (£5,000).  

However, there are some things to consider. Due to their size requirements and high upfront costs, biomass boilers may be less practical for smaller homes in built-up areas. In some cases, you may also require certification if you live in an Air Quality Management area. 

We’ve outlined some estimated costs for biomass boilers below:

Replacing a boiler can be a big investment, but it helps to understand all the factors that can impact your costs.

Boiler installation will typically add £1,000 to £2,000 to the initial boiler unit cost, so it’s important to budget for that. However, some additional work may be required during installation work. 

This can happen if, for example, some parts are more damaged than first expected or your installer believes your system requires a ‘flush’ to improve its performance (this can be necessary if you haven’t serviced your previous boiler for many years). 

For guidance, we’ve listed some of the most common extras that might be needed during your boiler installation with costs:

When choosing a new boiler there are many options of manufactuer on the market. The reputation of these brands, and their warranty offers will often dictate how cheap or expensive they will be. Your heating installer will be able to advise you on the brands which are the most reliable, long-lasting and cost-effective. 

To give you an idea of the costs, we’ve listed the most popular brands amongst engineers and homeowners below.

To get a more accurate price based on your needs, it’s best to get multiple quotes for your boiler installation to compare. Getting estimates from several installers gives you a greater chance of finding a deal to suit your budget. 

It can be tough finding installers, though, not knowing which ones to trust and getting lost in endless reviews. There is however a quick, simple way to avoid all this hassle; with our 30-second form. 

Simply tell us what you need and we’ll get to work connecting you with up to 3 qualified, vetted installers in your local area. You can then compare their quotes and pick the deal that suits you!

It’s completely free, with no obligations. Just click below to get started.

If you’re concerned about new boiler costs, there are some government funding schemes which could help. Depending on your location and circumstances, you could be eligible for a grant or funding towards a new boiler or other home heating systems. 

The main grant schemes currently available include:

Other funding and upgrade opportunities are available for Northern Ireland, Scotland and Wales specifically. These include the Affordable Warmth Scheme (NI), the Home Energy Scotland Programme / Warmer Homes Scotland, and the Warm Homes Programme in Wales. We recommend researching grants in your area to get the most up to date information and details on how to apply.

New boiler costs can range from £1,600 to £6,000, including installation fees, but the exact amount you will pay will depend on your specific needs. For example, you may want to upgrade your boiler type, change fuel source or look for a manufacturer with a great warranty. 

You should also consider the existing system you want to change. The older the system (or the longer you have to go without a full boiler service) the more likely it is you will need additional work during your installation. This could include a system flush or old pipe replacement.

No matter what your circumstances, the best way to get a good deal on your new boiler replacement is by comparing several quotes. This way you can compare prices and find the right fit for your budget. 

Tracking down heating engineers for quotes can be stressful, though. It can take hours or days to hunt for reputable installers and compare reviews - but there is a simpler way to tackle this! You can let us do the legwork for you. 

Once you fill in our quick, 30-second form, we’ll get to work connecting you with up to 3 qualified installers for free! They can offer you quotes to compare, and there are no obligations attached, so you can find a great deal without all the hassle! 

Just click the link below to get started.