Prices correct August 2026
If your boiler has given up the ghost or is reaching the point where a replacement makes more economic sense than repairing it, your first question is undoubtedly, “How much is it going to cost me to get a new boiler installed?”
In 2026, a new boiler typically costs between £2,000 and £5,000, including installation. There are a lot of factors that determine the final price, including the type of boiler you are replacing, what you’re replacing it with, your central heating system and the complexity of the work.
In this blog, we’ll take a look at what affects the overall cost to help you decide whether it’s the right time to replace your boiler.
At JPS Plumbing, Gas and Electrical, we typically charge between £2000 and £5000 for a replacement boiler. First, we’ll visit you to discuss your heating and hot water needs and assess your property. Then we’ll help you find a boiler that suits your needs and budget. You can expect honest advice, a transparent quote, and professional installation.
Contact us today for a free, no-obligation quote, or build your boiler quote online.
New boiler replacement costs at a glance
| Boiler type | Typical JPS price range* |
|---|---|
| Combi boiler | £2,000–£3,500 |
| System boiler | £2,200–£3,500 |
| Heat-only boiler | £2,300–£3,500 |
*Indicative prices. Your quotation will depend on the boiler and installation required.
A like-for-like, standard combi boiler replacement is at the lower end of the cost scale. If your heating system needs upgrades, or you want to relocate your boiler, you can expect to pay more.
What affects the cost of a new boiler?
There are many factors that affect the cost of a new boiler, and no two homes are the same. Let’s take a look at the main things that will affect your quote.
1. The type of boiler
In the UK, there are three main types of domestic gas boiler: combi, system and heat-only. The right boiler for your home depends on your existing heating setup, what space you have and how much hot water your household uses.
Combi boiler costs
Combination, or combi, boilers provide heating and hot water from a single unit, without the need for a separate hot water cylinder or cold water storage tank.
A like-for-like combi boiler swap typically costs £2,000 to £3,500 including labour.
Advantages of a combi boiler include:
- Minimal space required: There is no cylinder or water tank, so you only need space for the boiler itself.
- Hot water on demand: No waiting around – water is heated as it passes through the unit, giving you instant hot water.
- Simple installation: A straightforward combi boiler swap usually involves fewer components, so it’s an easier, quicker job.
- Generally more efficient: Modern combis are usually more energy-efficient than conventional boilers as they heat water on demand, so there’s no wasted energy keeping a tank warm.
Things to consider when choosing a combi boiler:
- Higher hot water demand: If you have a large household where hot taps are likely to be used simultaneously, and the shower is used a lot, a system boiler with a hot water cylinder might be the better option.
- Poor water pressure: If you don’t have high water pressure, a combi won’t give you the best hot water performance, as it relies on the pressure and flow from the mains.
- No stored water: If your boiler breaks down, there’s no backup hot water cylinder,
System boiler costs
A system boiler works with a separate hot water cylinder. If you have a large family, it’s worth considering, as you will have a regular supply of stored hot water.
System boiler prices typically range from £2,000 to £3,500, depending on the boiler and installation.
Advantages of a system boiler include:
- Suitable for higher hot water demand: Your stored hot water can be supplied to several outlets simultaneously
- No traditional cold water storage tank: If it’s paired with an unvented cylinder, it takes up less space than some conventional systems.
Things to consider when choosing a system boiler:
- Takes up more space: You’ll need a space big enough for the cylinder, commonly an airing cupboard or utility room.
- More complex to install: A system boiler has more components than a combi, so installation costs can be higher.
- Stored water can run out: Once the cylinder is empty, you’ll have to wait for it to replenish and heat up.
Heat-only boiler costs
A heat-only boiler, also known as a regular or conventional boiler, requires a hot water cylinder and cold water storage tank. If yours is coming to the end of its life, a common choice is to replace it with a modern combi. But where the existing heating system is working well, a like-for-like replacement is sometimes practical.
Heat-only boiler installations typically cost £2,000 to £3,500.
Advantages of heat-only/conventional boilers include:
- No need for expensive heating upgrades: If your heating works well, it can help keep the overall installation cost down.
- Good for high hot water demand: It stores water in a cylinder, meaning there is plenty for a large household.
- Backup hot water: Some cylinders have an immersion heater that can pick up the hot water demand if the boiler breaks down.
Things to consider when installing a new heat-only boiler:
- More space is needed: You’ll need room for both the cylinder and, with traditional setups, a cold water storage tank.
- Hot water isn’t unlimited: Once the stored supply has been used, you’ll need to wait for the cylinder to reheat.
- More components: Conversions or major alterations to a conventional system can make installation costs higher.
2. The size and output of your boiler
Boiler output is measured in kilowatts (kW). When recommending the right output for your home, it’s not as simple as matching a boiler to the number of bedrooms you have. Your installer should be considering two different demands: the space-heating requirement, and (for a combi boiler), your hot water requirement.
They will:
- consider the size of your property, including number of bedrooms and bathrooms
- carry out heat loss calculations
- look at the number and type of radiators
- check insulation levels
- ask about your household’s hot water use
You can count on JPS to recommend an appropriate output based on these factors, rather than simply fitting the largest boiler available.
3. Boiler brand, model and warranty
It’s natural to want to shop around for the best boiler for your money, but the least expensive option isn’t always the right choice long-term. More premium brands or models can come with longer warranties, for example. Similarly, the most expensive option isn’t necessarily the right one when a budget brand can deliver what you need equally as well.
At JPS, we only use the most trusted boiler brands. Here are a few we recommend most often.
Combination boilers
- Vaillant ecoTEC Plus 826 Combi: around £3,500 including installation, with a 10-year warranty.
- Baxi 824 Combi: around £2,700, with a 10-year warranty.
- Main Eco Compact 25kW Combi: around £2,200, with a five-year warranty.
Heat-only boilers
- Vaillant ecoFIT Pure 415 Heat Only: around £2,500 including installation, with a 10-year warranty.
System boilers
- Vaillant ecoTEC Plus 615 System: around £3,200 including installation, with a 10-year warranty.
- Baxi 818 System: around £2,700, with a 10-year warranty.
- Main Eco Compact 15kW System: around £2,300, with a five-year warranty.
[JPS to confirm August 2026 model availability, prices and warranty periods before publication.]
4. Installation costs
Labour is another major factor in how much a new boiler costs. Here are the typical scenarios:
Like-for-like boiler replacement
Replacing a boiler with another of the same type in the same location is usually the simplest and, therefore, cheapest option – provided that most of the existing pipework and heating setup can remain in place.
Moving a boiler
Many customers take the opportunity to move their boiler to a more convenient or discreet location, for example, a kitchen cupboard or utility room. This requires more work, with pipework and flue alterations normally required.
Moving your boiler can add around £500 to £1,000 to the overall cost, depending on the distance and how complex it is.
Converting to a different boiler type
Converting from a conventional boiler to a new combi boiler is a bigger task, as cylinders and tanks need removal and pipework may need alteration. Conventional boiler replacements typically cost between £1,800 and £3,000.
Upgrading from an old oil or electric boiler is the most complex scenario, as you’re also changing the fuel supply, connection and installing a new meter. So you can expect to pay far more than a straightforward replacement.
5. Heating controls and required upgrades
When installing your new boiler, you might need to make changes to your heating controls to meet current standards, for example, by installing thermostatic radiator valves. New thermostats, timers or smart heating controls can typically add around £100 to £250.
If you’re switching from direct electric heating to a gas boiler, you may also need a new central heating system, including pipework and radiators. When converting from oil or an electric boiler, your existing pipework and radiators might be suitable, but you could consider a new heating system to get the most out of your new combi boiler.
Your engineer should explain any necessary work before installation and include it clearly within your quotation.
If you’re in our local area, you can find out more about:
6. What other costs can come with a new boiler?
It’s important to compare quotations on a like-for-like basis rather than just looking at the boiler price, as other work may be necessary/recommended. When setting your budget, consider these possible additional costs:
Cleaning the heating system
Older systems can suffer a build-up of sludge, rust and debris. Your heating engineer might recommend a system flush to help protect your new boiler and maintain efficient circulation.
The method required will depend on the condition of the system. A more extensive system flush can cost around £850.
Replacing a hot water cylinder
If you are installing a new heat-only or system boiler, you may need to replace your hot water cylinder, which can add approximately £500 to £1,000 to the overall cost.
Are boiler grants available in 2026?
In 2026, there’s no general government grant to replace an old boiler with another gas boiler. But certain households may qualify for help with wider heating or energy-efficiency improvements under the following schemes:
Energy Company Obligation (ECO4)
The Energy Company Obligation (ECO4) is currently due to run until 31 December 2026.
It supports low-income households to make energy-efficient improvements, including insulation, smart controls, heat pumps, first-time central heating installations and boiler repairs.
Boiler Upgrade Scheme (BUS)
The Boiler Upgrade Scheme (BUS) isn’t for installing a new gas boiler. Instead, it helps eligible property owners in England and Wales to replace gas boilers with low-carbon alternatives, such as heat pumps.
For the latest eligibility criteria and grant information, visit gov.uk.
Is a new boiler worth the cost?
If your existing boiler is relatively new, operating well and is easily repairable, replacing it probably doesn’t make sense.
But if your boiler is getting on in years, is increasingly unreliable, and the parts are becoming harder to source, it might not be worth the cost of keeping it fixed.
A new, modern boiler with smart controls gives you more control over your heating and can help reduce your energy use and bills.
If you’re unsure whether it’s time for a new boiler, JPS can provide a reliable assessment and offer our recommendations. Read more in our blog: When is a boiler considered beyond economic repair?
Get a clear quote on a new boiler
A new boiler is a significant expense for most of us, so it’s important to know exactly what you are paying for up front, with no surprises down the line.
At JPS Plumbing, Gas and Electrical, our Gas Safe registered engineers will consider your current boiler and heating system, carry out a heat loss assessment, discuss your hot water requirements and recommend a boiler that makes sense for your home and budget.
We also offer boiler cover to help look after your heating system after installation.
Contact JPS today for a free, no-obligation quote, or build your boiler quote online.
Frequently asked questions about new boiler installation cost
Why does a conventional boiler cost more than a combi?
Usually. A like-for-like replacement in the same location tends to involve less alteration to pipework and other components. Changing boiler type or moving the boiler can increase labour and material costs. However, the cheapest installation isn’t necessarily the best long-term option, so it’s worth considering what suits your home.
How long does it take to install a new boiler?
A straightforward like-for-like boiler replacement can often be completed relatively quickly in around 4-6 hours, while relocating a boiler or converting the central heating system will take longer, typically 1-3 days. Your installer should confirm the expected timescale after assessing your property and the work required.
Can I still replace my gas boiler in 2026?
Yes. In 2026, there is currently no ban preventing homeowners from replacing a gas boiler in an existing home.
The government has stated its ambition to move away from new and replacement natural-gas boilers by 2035 as the UK transitions towards lower-carbon heating, but no date has been set in stone yet.
Rules for new-build homes are different. The Future Homes Standard comes into force on 24 March 2027 and requires new homes built to the new standard to use low-carbon heating and meet higher energy-efficiency requirements.