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myOil Boiler Replacement Cost
At a Glance
- The average oil boiler replacement cost is around £2,450 in the UK.
- Fitting a new oil boiler will typically take between 1 to 2 days to complete.
- What the cost of a new oil boiler is in 2025, as well as what oil boiler installation costs in the UK.
- How long it takes for a heating engineer to complete this job, what's involved in installing a new oil boiler, and things to consider.
- How to find and hire an OFTEC-registered heating engineer near you.
Looking into how much an oil boiler installation costs in the UK?
In 2025, the average cost of an oil boiler replacement is £2,450. However, oil boiler costs are impacted by factors such as the size of the boiler, how complex your central heating system is to work, and your location in the UK.
In this oil boiler cost guide, we cover everything that you need to know. This includes typical oil boiler prices in the UK, how much a heating engineer will charge for installing an oil boiler, and much more!
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£2,450
Table of Contents
How Much Is a New Oil Boiler?
Installing an oil boiler can cost anywhere between £1,620 to £3,150. This price depends on:
- The type and size of oil boiler
- The OFTEC-registered engineer’s daily rate
- The complexity of the installation (whether it's a like-for-like swap, or a brand new installation)
Oil boilers are popular in off-grid properties where a standard gas connection isn't available.
Modern oil boilers will not only make your bills cheaper due to improved efficiency, but they'll also make your heating more effective.
Can an oil boiler be used off grid?
"The oil boiler will need a power supply and you will need the oil delivered into a tank on your property."
Oil Boiler Prices
To start with, let's look at the total supply and installation costs for 3 different types of oil boiler:
| Oil Boiler Model | Total Estimated Cost |
|---|---|
| Firebird Envirogreen Kitchen C26 Internal Regular Oil Boiler | £1,620 - £2,220 |
| Grant VortexBlue Kitchen/Utility 36kW Regular Oil Boiler | £2,300 - £2,900 |
| Worcester Bosch Greenstar Heatslave II 25 Combi | £2,550 - £3,150 |
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Oil Boiler Supply Costs
Here are the individual oil boiler supply costs for the Firebird, Grant, and Worcester Bosch models for easy comparison:
| Oil Boiler Model | Supply Cost |
|---|---|
| Firebird Envirogreen Kitchen C26 Internal Regular Oil Boiler | £1,420 |
| Grant VortexBlue Kitchen/Utility 36kW Regular Oil Boiler | £2,100 |
| Worcester Bosch Greenstar Heatslave II 25 Combi | £2,350 |
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Oil Boiler Labour Costs
Let's break down the total installation costs: Oil boiler technicians charge between £200 and £400 per day.
Here are some estimated labour costs for a like-for-like oil boiler swap, as well as converting from another heating system:
| Job Description | Duration | Labour Cost |
|---|---|---|
| Like-for-like oil boiler replacement | 1 – 2 days | £200 - £800 |
| Brand new oil boiler installation | 3 - 4 days | £600 - £1,600 |
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Alternatives to Oil Boilers
Combi boiler costs are the lowest-priced heating alternative at around £2,750, but they might not be a feasible option if you live off-grid, away from the mains gas supply.
Here are some viable off-grid heating options to choose from:
- Biomass boilers cost £13,200 to install, offering a renewable energy solution using logs, coal, or pellets as fuel.
- Air source heat pumps cost £8,000 to install, extracting heat from the air to provide heating and hot water.
How often should an OFTEC technician service my oil boiler?
"You should have your oil boiler serviced annually. This should include a new nozzle and a new supply hose. Unless you fit a green coloured hose, which have a life expectancy of 2 years before being changed."
Things to Consider When Installing an Oil Boiler
The oil boiler works the same as other fueled boiler types, by pumping the hot water through radiators to heat up the room, but there are benefits of an oil boiler.
Oil boilers will not only reduce your energy bill, but will also help to reduce your carbon footprint too. You must consider that whilst your energy bills will be cheaper, it will cost you more to buy the oil boiler and install it compared to other boiler options.
How efficient is the average oil boiler?
"90% plus on today's boilers. But they need to get set up correctly to achieve this."
Once you’ve decided on the type and size of the oil boiler you want, you will need to think about the best place to install it. Most boilers are fitted in a utility room or garage.
You will also have to remember that there is a risk of your oil boiler producing carbon monoxide, so it’s extremely important to buy a carbon monoxide alarm for your boiler.
You will need to hire a professional engineer to install your oil boiler. This means using an OFTEC-registered installer.
Can You Install an Oil Boiler Yourself?
You cannot install an oil boiler yourself unless you are a qualified, experienced and professional OFTEC-registered engineer.
If you’re replacing your old boiler, the engineer will have to come and assess the boiler and how to replace it, as well as help you decide what type of boiler is best for you, before they can give you an accurate quote.
If you have need to keep oil in an oil tank in your garden, how can this be done safely?
"I'd say it should be kept in a non corrosive container such as a PVC drum. The container should be placed in a protective enclosure."
By hiring a professional to install your oil boiler, you will not only avoid potential damage, but you will save time and money.
Are there any repairs on an oil boiler I can undertake DIY?
"The simple answer is no. Even though oil boiler repairs are not regulated like gas services are, you are still burning a fossil fuel and, therefore, if the correct air / fuel ratios are not achieved then excessive emissions may occur.
Whilst most boilers these days are room sealed to the atmosphere, part of the service / repair schedule is checking and identifying any defects within the case seals of the combustion area. If these are defective, then products of combustion can enter the room / or spurious air being drawn into the combustion chamber which could affect the combustion fuel / air mix.
Other than the reasons above, there are various electrical issues to attend to and be aware of. In any event, to ensure that the appliance is burning correctly and to the manufacturers' specifications, you need a flue gas analyser to prove the performance."
Whilst most boilers these days are room sealed to the atmosphere, part of the service / repair schedule is checking and identifying any defects within the case seals of the combustion area. If these are defective, then products of combustion can enter the room / or spurious air being drawn into the combustion chamber which could affect the combustion fuel / air mix.
Other than the reasons above, there are various electrical issues to attend to and be aware of. In any event, to ensure that the appliance is burning correctly and to the manufacturers' specifications, you need a flue gas analyser to prove the performance."
Checklist: How To Find and Hire an OFTEC-registered Engineer in the UK
When installing a new oil boiler, it's critical for your safety to hire a registered OFTEC engineer to complete the fit. Here's what we suggest when searching for your contractor:
- Gather at least 3 quotes from different OFTEC-registered engineers to compare costs.
- Check the engineer's OFTEC-registered status, and look at their past jobs to see if they've got a track record for similar projects.
- Read over the engineer's customer reviews, paying close attention to any comments on timekeeping, cleanliness on site, and overall quality.
- Confirm the engineer is insured, asking for proof of public liability insurance.
- Ask for a written quote, including all aspects of the work, with a fully itemised cost breakdown so there are no hidden charges.
- Once the work has been completed, make sure you get an OFTEC compliance certificate to certify the work.
Sources
https://energysavingtrust.org.uk/about-us/our-data/
https://heatingoil.co.uk/2023/05/02/oil-central-heating-vs-gas-which-one-is-cheaper/
https://www.drplumbingandheating.co.uk/why-choose-an-external-oil-boiler/
https://www.rix.co.uk/blog/post/benefits-of-using-an-oftec-engineer-for-oil-boiler-servicing
https://www.cpsfuels.co.uk/news/cps-fuels-guide-to-domestic-heating-oil-tanks-heating-oil-tank-faqs
https://www.chestnutplumbing.co.uk/oil-boiler-faqs.html
