Cheap Boilers in the UK: Models & Affordable Installation (2025)

Understanding new boiler costs can feel daunting. Combining supply and installation costs can soon add up. That’s why it’s important to understand your budget and find boiler models that can help keep costs down. 

To help you with this, we’ve compiled a list of the best cheap boiler options for your home. Whilst new boiler costs can range from £600 - £4,000, with an additional £1,000 - £2,000 for installation, we’ve thoroughly researched the market to find you the best brands offering low cost boiler models.

To make the best choice, and to ensure a professional installation, consulting a registered heating engineer in your area is crucial. Finding a qualified installer can take days of research, assessing services and comparing prices.

We understand that not everyone has time for that, which is why we offer a better way.

Simply fill out our 30-second form and recieve up to 3 free, non-binding quotes from professional installers in your area, so you can get the best offer easily.

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A new boiler can cost between £600 - £4,000 before installation fees. A cheap boiler is considered to be anything under £1,000 - £1,500. This includes all types of boiler and fuel options. To find cheap boiler options, there are a few key areas we can focus on to narrow down the cost range. 

Different boiler types and fuel sources have a big impact on the price. For example, gas combi boilers are the most common boiler type in the UK. This means there are more options to choose from, including cheaper options from the biggest brands. In comparison, an oil boiler is much less common and more complex to manufacture, meaning costs are usually higher.     

Brand reputation and the quality of the materials can also determine how cheap or expensive a boiler will be. To help you get an overview of how much cheaper boiler options can cost, we’ve compiled a list of estimates below. This includes all brands which offer cheap boiler models. 

It’s important to note that while costs matter - when it comes to such a crucial home appliance as your boiler, there are other factors you must consider. To find the best and cheapest boiler combination, you must also consider the following: 

When considering good boiler deals, it’s important to consult a professional heating engineer for peace of mind that your choice of cheap boiler will perform at its best.

In addition, we recommend comparing quotes from multiple installers to find the best rates in your area - but we understand that this process can take many hours and can become overwhelming.  

Luckily, we can help you find quotes easily!

By filling in our simple form, you can get up to 3 free quotes from our network of trusted installers, who are fully registered and vetted by us.

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Finding cheap boiler deals can seem like a huge challenge, but the best way to understand your boiler needs is to consult a heating engineer. They can assess the hot water demands of your home and suggest suitable models. If you have a budget in mind, they can also work with you to stay within your price range. 

If you’re worried about the financial impact of a new boiler, there are some Government funding schemes available to help keep your home warm. One of which includes the Boiler Upgrade Scheme, which can help people finance the installation of a low-carbon heating system, such as an air source heat pump. 

As not everyone is eligible for support schemes like these, it’s also useful to know which boiler brands and models are typically priced below the £1,000 mark. To help you find a cheap boiler model, we’ve done extensive research and listed below some of the top boiler models on the market, all of which typically sit below £1,000 - £2,000 (before installation).

Combi boilers are best suited to small homes and flats since they are compact. From one unit, they provide heating and hot water at local mains pressure. 

Combi boilers offer two outputs, one for central heating (CH) and one for domestic hot water (DHW). Providing hot water requires more power from the boiler so its output will be higher, making it a better indicator of the boiler's overall size. 

Combi boilers have the biggest selection of affordable options starting from under £1,000. We’ve listed some of the best in the table below.

Best combi boiler in the UK under £1,000: Baxi 600 Combi 2 (24kW) | £860

This cheap combi boiler from Baxi comes with an output of 24kW, making it suitable for smaller homes with up to 10 radiators and 1 bathroom. 

It stands out as the best budget combi boiler because of its 7-year parts and labour warranty. This shows that Baxi has full confidence in its product, indicating that you can trust that it won’t break down easily. 

This affordable combi boiler also offers 94% energy efficiency. This means for every £1 you spend on energy, only 6 pence is lost. It also earns an ErP (Energy-related Products) rating of A for heating and hot water efficiency.  

Some other stand-out features include:

To make the best decision for your home and to ensure a professional installation, consulting a registered heating engineer in your area is strongly recommended. Luckily at GreenMatch, we can save you hours of painstaking research time by connecting you to our network of trustworthy installers, all vetted by us.

Simply fill out our 30-second form, and within 48 hours, you will receive up to 3 installer quotes so you can secure the best deal.

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System boilers work alongside an external hot water storage cylinder, allowing them to meet the heating demands of medium to large homes, with 10 - 20 radiators and 2 or more bathrooms. 

System boilers can cost between £600 - £3,000, with prices varying depending on the fuel type and output size you need. For example, a gas system boiler (18kW - 26kW) will cost between £600 - £1,700. However, an oil system boiler (18kW - 26kW) can cost £1,850 - £3,600.

The range of system boilers from the top boiler manufacturers under £1,000 is quite limited. That’s why we’ve included some models up to £2,000, for those who would like a system boiler and are willing to pay more. 

Best system boiler around £1,000: Worcester Bosch Greenstar 4000 System (12kW) | £1,150

This system boiler by Worcester Bosch comes with a heating output of 12kW, making it the most suitable to run alongside a hot water cylinder. The Greenstar 4000 system range is 94% efficient, with grade A for heating. 

This boiler also offers the longest warranty from this range of up to 10 years when installed by a Worcester Accredited Installer. This ensures you're covered against any issues that may come up over the major of the boiler's lifetime. 

Conventional boilers (aka regular or heat only) are the oldest boiler type and are best suited for larger homes, with a high hot water demand. This is because conventional boilers work with a hot water cylinder, as well as a cold water feed tank (usually found in the loft), so they can supply greater quantities. 

This set up can cost a lot more to install, however, and smaller homes might struggle to find the space for the neccessary parts. Therefore, it is recommended that you only choose a conventional boiler, if you are replacing an existing one. 

Medium to large homes, looking for a modern boiler should consider combi or system boilers, as they can serve the same demand levels, take up far less space and they are also quicker and cheaper to install.

That being said, homes with conventional boilers already in place can find affordable like-for-like replacements if they don't wish to switch to a new boiler type. With this in mind, we’ve provided a range of the best conventional boilers available on the market below. However, we have included prices up to £2,000 for added choice.

Best conventional boiler around £1,000: Vaillant ecoTEC Plus Heat Only (12kW) | £970

After comparison with others on the market, this boiler model from Vaillant is one of the best and cheapest conventional boilers,  offering great value for your money. 

It has 94% energy efficiency, meaning only 6% of energy is wasted from combustion and heat loss. It’s also rated A for heating. This boiler comes with a 5-year standard warranty with options to extend this to 10 years when installed by a Vaillant Advance installer.

As you can see, there are many great, cost-effective boilers to choose from. Figuring out which cheap boiler is best for your home overall can be overwhelming and take up hours of your free time.

Thankfully, GreenMatch can offer you an easy alternative.

Fill in our simple 30-second form and we'll connect you with up to 3 qualified, local heating engineers from our vetted network. Our service is completely free and non-binding.

Click the button below to get your boiler quotes.

Beyond the initial costs for supply and installation, it’s also important to consider the running cost of a new boiler. Under the current energy price cap, natural gas remains the cheapest energy source to fuel your heating system, at 6p/kWh. 

One of the cheapest boilers in the UK is the Baxi 600 Gas Combi 2 (24kW) boiler (aka Baxi 624). It has an impressive 7-year parts and labour warranty and an impressive price-quality ratio (at approx. £860, it’s one of the best cheap combi boilers on the market). With an efficiency rating of 94%, pairing this model with a cheap fuel type like natural gas will have a noticeable impact on your heating bill. 

To determine which heating system is the cheapest to run, you first need to consider three main factors. Each one will impact your costs, so it’s good to know your options. These are as follows:

Fuel type
The fuel type you use directly impacts your running costs, as each one is charged at different rates per kilowatt-hour (kWh). For boilers, the most popular fuel is natural gas, as it’s typically the cheapest option. However, oil, LPG, biomass and electricity are also viable options - particularly if you are not connected to the gas grid. 

Boiler efficiency
It’s also important to understand the efficiency of your boiler. This will determine how much usable heat you will actually get for your money. As explained earlier, anything above 92% will ensure you waste very little fuel per unit (only 8%). 

Standing charges
If you use grid-supplied fuel (gas or electricity), you will also have to pay a fixed daily standing charge. This fee is added to your bills to help cover the cost of delivering and maintaining the national grid. This charge can fluctuate depending on your location and supplier, but it is regulated by Ofgem. 

To help you better understand how these factors can influence running costs and to compare which heating system may be cheaper for you, we’ve made some calculations below. Here we have used current fuel tariffs to estimate the annual running costs for the average 2-3 bedroom home.

As we can see from our comparisons above, gas boilers are the cheapest heating system to run under current price tariffs per unit of energy. However, with additional standing charges, you may have to pay between £113 - £120 per year on top of this figure. (Find out more about specific regional charges from Ofgem). 

Oil boilers are a fantastic option for those not connected to the grid, but they do present drawbacks. They require large storage tanks for fuel on your property and regular ordering schedules to ensure you don’t run out of oil.

They also have a significant impact on the environment, releasing 4 to 6 tonnes of CO2 per household annually and adding harmful pollutants to the air. Phasing out oil boilers is also part of the UK’s wider plan to achieve zero emissions by 2050 (so it may be worth considering alternatives).

For a more eco-friendly heating option, biomass boilers do give homeowners a low-carbon alternative and are comparable in cost to fossil fuel options. However, you need to ensure they are permitted for use in your area. In addition, you may receive up to £5,000 off the installation costs of a new biomass boiler under the Boiler Upgrade Scheme. 

Electric boilers conversely, cost the most to run. This is because per unit electricity is by far the most expensive fuel option. However, if your home has solar panels and you can generate free renewable electricity, an electric boiler can be an excellent choice - as it’ll heat your home at almost no cost. If solar is of particular interest, solar thermal panels can also offer a completely renewable source of home heating.  

Replacing your boiler involves a number of key steps, and depending on the complexity of your installation, this can also affect the cost. Understanding exactly how a new boiler is installed can help you better prepare for any additional fees. Added costs will come from moving a boiler's location, changing boiler types, or adding/removing old pipework. 

As a guide, we’ve outlined the installation process below. The cheapest boiler installation process will always be a ‘like-for-like’ replacement, as this is the quickest type, involving fewer steps:

When shopping for a new boiler, you will find costs range between £600 - £4,000. This price does not include installation, however, which can add £1,000 - £2,000 to the overall cost.

There are various ways to reduce your overall spending when it comes to finding the best value boiler supply and installation costs. We’ve highlighted some of these below: 

Sourcing multiple quotes takes considerable time and effort with so many options available to you. Avoid spending hours of your time researching boiler prices and top boiler deals. Instead, let us do the leg work for you! It’s as simple as the steps below.

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