How Much is a New Oil Boiler?

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A new oil boiler can cost anywhere from £1,000 to over £3,000

Installing a new oil boiler can cost between £800 and £2,000

Fill out the form above to get a boiler quote from a trusted installer in your area


Gas boilers are the most popular method for heating homes in the UK, but if you live in one of the four million homes not connected to the mains gas network, then you might have to rely on a different fuel for your central heating: oil.

Because fewer homes use oil heating, there are fewer oil boilers on sale than gas boilers, but there are still dozens of models to choose from, and they come in a wide variety of sizes and prices.

If you’re considering getting your home a new oil boiler, why not pop your details in this short form, and our local installers will be in contact with free quotes.

a person changes the temperature on their oil boiler, which costs more than most types of boiler

What’s in This Guide to Oil Boiler Costs and Installation?

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How Much Does a New Oil Boiler Cost?

Oil boilers tend to be more expensive than gas boilers; prices for gas boilers start at around £500 or £600, whereas you’ll find very few oil boilers for less than £1,000.

Entry-level oil boilers typically start from around £1,000, while top-of-the-range oil boilers can cost over £3,000.

As a rule of thumb, the larger the oil boiler, the more expensive it will be. The size of a boiler is measured in kilowatts (kW), which tells you how powerful it is. Usually, the larger your home is, the bigger the boiler you’ll need.

The table below shows you the typical cost of oil boilers for small, medium and large homes.

Property Size
Number of Bedrooms
Number of Bathrooms
Number of Radiators
Boiler Size
Price Range
Small
1 to 2
1
up to 10
24kW to 27kW
£1,220 to £3,480
Medium
3 or 4
up to 2
up to 15
28kW to 34kW
£1,750 to £2,615
Large
4+
2+
15+
35kW to 42kW
£1,450 to £4,600

Prices will also be affected by what type of oil boiler you get. There are 3 types of oil boiler available: combi, conventional and system models.

Combi oil boilers are often the most expensive, but they don’t require you to install a water tank or cylinder in your loft or airing cupboard (saving you lots of room!). The table below shows you the price range of combi, conventional and system oil boilers:

Boiler Type
Price Range
Combi
£1,300 to £4,600
Conventional
£1,045 to £2,500
System
£1,175 to £3,200

Oil Boiler Running Costs

You’ll also need to think about the running cost of your oil boiler. Which? estimates that the annual cost of heating a three-bedroom house with an oil boiler is around £1,355, compared to between £770 and £950 with a gas boiler.

However, OFTEC (the trade association for oil heating engineers), states that you can lower your heating bills by 20-30% if you upgrade from an old oil boiler (seven years old or more) to a modern, efficient oil boiler.

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Boiler House


Oil Fired Boiler Prices by Brand

The five leading manufacturers of oil boilers in the UK are: Worcester Bosch, Grant, Mistral, Firebird and Warmflow.

Grant and Worcester Bosch are considered to be the best boiler brands in terms of their build quality, reliability and ease of use, with the Worcester Bosch Greenstar Heatslave II being the UK’s most popular oil boiler.

Below we’ve listed the cheapest and most expensive combi, system and conventional oil boilers produced by each of the five brands.

Worcester Bosch Oil Boiler Prices

Combi Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Greenstar Heatslave II
18kW
91%
2 years
£2,300
Greenstar Heatslave External
32kW
90%
5 years
£2,736

Conventional Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Greenstar Danesmoor
18kW
91%
5 years
£1,429
Greenstar Danesmoor External
32kW
90%
2 years
£2,582

System Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Greenstar Danesmoor
18kW
91%
5 years
£1,340
Greenstar Danesmoor External
32kW
90%
2 years
£2,530

Grant Oil Boiler Prices

Combi Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
VortexBlue Internal
21kW
91%
2 years
£1,700
VortexBlue External
26kW
92%
2 years
£2,500

Conventional Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Vortex Eco Utility
15kW
91%
2 years
£1,247
Vortex Pro External
58kW
93%
2 years
£2,770

System Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Vortex Eco External System
15kW
91%
2 years
£1,630
Vortex Eco External
58kW
93%
2 years
£2,770

Mistral Oil Boiler Prices

Combi Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Standard C1
20kW
87%
2 years
£1,800
Outdoor Mega Combi Plus CODMC7
70kW
90%
2 years
£4,600

System Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
S1
20kW
87%
2 years
£1,320
CS4
41kW
93%
2 years
£3,200

(Mistral don’t produce conventional oil boilers)

Firebird Oil Boiler Prices

Combi Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Enviroblue Combi-Pac External
20kW
93%
2 years
£1,300
Eviroblue Combi Internal
35kW
92%
2 years
£3,450

Conventional Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Enviromax Kitchen Internal
20kW
93%
2 years
£1,270
Eviromax Popular Boilerhouse
73kW
92%
2 years
£2,500

System Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Enviroblue Kitchen Internal
20kW
93%
2 years
£1,250
Eviroblue Kitchen Internal
35kW
93%
2 years
£2,000

Warmflow Oil Boiler Prices

Combi Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Utility UC70HEE
21kW
89%
5 years
£1,345
Kabin Pak KC70HEE
21kW
89%
2 years
£1,995

Conventional Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Boilerhouse B70HE
21kW
91%
7 years
£1,045
Utility HE U9HE
26kW
91%
7 years
£1,990

System Boilers:

Model
Size
Efficiency
Standard Warranty
Typical Price
Utility US70HE
21kW
91%
5 years
£1,175
Kabin Pak KS90HE
26kW
91%
2 years
£1,790

Cost to Install a New Oil Boiler

On top of the cost of your new oil boiler, you’ll also need to pay to have it installed in your home.

Did You Know?

The cost of installation can be as much as the boiler itself, with prices typically ranging between £800 and £2,000.

How much you’ll be charged will depend on the amount of work involved in the installation. Swapping from a conventional model to a combi model, for example, will cost a lot more than if you simply replaced your existing combi oil boiler with a new one.

Installations that involve removing or adding parts such as water tanks and pipes, or include work on your wider central heating system, will be more expensive.

Always use an OFTEC-registered engineer to install your oil boiler and central heating system. This ensures that it’s installed safely and by someone who’s properly qualified to do the job.

All OFTEC engineers must complete a training course before they are accredited, and undergo regular inspections. You can find OFTEC-registered installers on the OFTEC website.


Don’t Forget the Cost of the Tank

If you’re buying an oil boiler for the first time, you’ll also need to buy a tank to store the oil which fuels your boiler. These storage tanks are pretty bulky, and will need to be installed outside your home in a place where it won’t be exposed to heat or fire.

Domestic oil storage tanks come in a variety of sizes up to 3,500 litres, but most homes will only need around 1,000 to 1,400 litres of storage capacity.

As a rule of thumb, the larger your oil boiler, the larger the storage tank you’ll need. A boiler engineer will be able to advise you on the correct size for your home.

Oil storage tank prices start from around £1,000 and go up to more than £2,000, depending on their size. You can also rent a tank from your oil supplier, for a monthly fee. The table below shows you the typical price of differently sized oil storage tanks:

Tank Size (litres)
Typical Price
1,000
£1,200
1,100
£1,250
1,200
£1,300
1,300
£1,350
1,400
£1,400
2,000
£1,600
2,500
£1,650

Buying on Finance

For many homeowners, buying a new oil boiler can be a pretty big investment, and one that you might not have all the money to cover. But don’t worry – many companies offer you the option of buying your new boiler on finance.

What this essentially means is that you borrow some (or all) of the money you need to buy your new boiler. You then pay back the amount you owe in small monthly instalments, usually over two to five years.

This allows you to spread the cost of your new oil boiler and removes the burden of you having to pay for it in one go.

Most finance agreements require you to pay interest on your monthly repayments, meaning you’ll end up paying more for your oil boiler than if you bought it upfront.

You’ll also need to pay a deposit to secure your boiler (often around 10% of the total cost), but there are some deals around that don’t require a deposit.

Boiler companies offer a range of finance deals that have different repayment periods, interest rates and deposit amounts. Eligibility is subject to credit checks and all applicants must be aged 18 or over and live in the UK.

We recommend you shop around and get a quote from at least three companies to find a finance agreement that suits your needs.

The table below shows you some examples of finance options for a new oil boiler:

Oil Boiler Cost
Deposit Amount
Loan Amount
Monthly Repayment Amount
Monthly Interest Rate
Length of Loan
Total Repayment Amount
£1,900
£0
£1,900
£79.16
0%
2 years
£1,900
£3,000
£300
£2,700
£86.49
9.9%
3 years
£3,113.64
£3,000
£300
£2,700
£56.71
9.9%
5 years
£4,192.80
£3,000
£300
£2,700
£34.49
9.9%
10 years
£4,192.80

What’s next?

Want an oil boiler to be the next addition to your home? Fill in our short form, and a local installer will be in contact with you shortly.

Fran Whittaker-Wood Editor

Fran is The Eco Experts’ resident solar panel and double glazing oracle She loves orangutans and is passionate about protecting the planet’s rainforests from the unsustainable production of palm oil. And minstrels.