Oil Boiler Explained: Prices, Pros & Cons and Reviews (2024)

It’s estimated that there are around 4 million homes in the UK that do not have access to the gas grid. For people living in rural areas, a suitable alternative to fuel their home heating is to install an oil fired combi boiler.

Oil boilers in the UK are typically a cost-effective method of fuelling a central heating system, although the price of oil can fluctuate.

In this article, we’ll be looking at:

If you live off the gas grid and want to look at an alternative heating option, an oil boiler might be the right choice for you. Keep reading to find out how much it might cost you to purchase and install in your home.

If you’re ready to upgrade to a highly efficient new oil boiler, but don’t know where to start we can help! 

Avoid the stress of searching for hours to find quotes and reliable installers, instead why not use our quick and easy form? We’ll find you up to 3 quotes from qualified installers in your local area, so you can get the very best price and the highest quality service. 

It’s free to use and there’s no obligation! Find your perfect new oil boiler, and start enjoying a warmer, more efficient home in no time. Simply click the link below. 

One of the first things you’ll want to know is how much an oil boiler cost? 

When it comes to the cost of a new oil combi boiler, you need to consider both the price of the unit needed as well as the installation fees. We’ve outlined below some of the typical estimates you can expect for different-sized properties. 

New boiler costs can differ depending on the size of the boiler you require. The best way to get a sense of the size you need is to account for 1.5 - 2kWs for each radiator in your home. For example, if you have up to 10 radiators a boiler size from 20kW would be sufficient for your heating needs. 

It should be noted that since 2017, oil boilers have been legally required to have a SEDBUK rating (Seasonal Efficiency of Domestic Boilers in the UK) of at least 86%. The most energy-efficient oil fired boilers are 89-93%.

We can see in our price comparison table above how the different boiler sizes carry different charges – the larger you go, the higher the price you pay. While it may be tempting to get the largest model possible to ensure you always have a good supply of hot water, it isn’t always necessary and can just end up costing you more in running fees and upfront costs to get it installed in the first place.

The estimated supply costs can range between a few thousand pounds, so if you’re looking for a cheap heating system it’s worth doing the calculations and getting the right size for your home – and nothing more!

Unfortunately for first-time oil combi boiler buyers, the costs don’t end with the oil boiler itself – you also have to factor in the oil storage tank. In addition, unless you are opting for a combi, you will also need a hot water tank or cylinder installed in your home, too.

You can expect extra costs of between £330 to just over £1,500 for a new hot water cylinder. Check out this link for full details on hot water cylinder prices.

If you’re ready to replace your existing boiler with a new efficient model, HouseholdQuotes can help! 

We can help you find the most suitable heating engineer for your job, at a price that fits your budget. Using our simple form you could get up to 3, completely free quotes to compare prices in your area. 

By comparing quotes, you can ensure you get a great deal from an engineer you can trust for the best combi boiler for your home. Simply click the link below to get started.

There are many aspects that can affect the total cost of a new oil boiler. These include not only the price of the boiler and its additional parts but also installation labour, running costs and future maintenance.

Let’s look at some of the main factors you will need to consider. 

As you might expect, labour costs for installing a new oil boiler can vary greatly. As with all projects in the house, replacing like-for-like is always going to be the most cost-effective route when you’re looking to upgrade your appliances – and the same is true for your oil boiler. The only case where a like-for-like swap is not available is with back boiler replacements.

This is especially true for conventional or regular boilers, as you will already have the required cylinders in place which will make the switch far easier, instead of having to remove those if you’re opting for an oil combi boiler, for example.

Another factor that can impact labour costs is, for example, switching your boiler type to oil from gas or another fuel type. This will cost considerably more. You can expect costs of around £500 for labour replacing a like-for-like oil combi boiler and something nearer to £2,000 for more complex fuel switches.

Installing the best gas boilers for home heating is likely to cost, in comparison, between £500 to £1,000. The need to install an oil storage tank and any other related pipework or parts is partly why the costs rise for an oil heating system. 

Location can also affect labour costs. Whether you opt for an internal or external oil boiler, or whether you simply want to move your existing boiler to a new location, there can be cost differences depending on where you choose to store your oil boiler. 

The cost of moving an oil fired combi boiler can add as much as £800 to your installation – let’s look at some of the associated costs:

As with all trades, you can expect higher oil boiler replacement costs in capital cities for the same work as you would in more rural locations, and the same is true when choosing between local and national installers.

The boiler manufacturer you use can also impact how much you pay overall. Firstly, this is because certain brands require specifically trained engineers to install them. Secondly, you will also pay more for the better, more recognised models - especially those with longer warranties or guarantees to offer. 

Below are 5 of the best manufacturers for oil boilers and some guidance on oil boiler prices in the UK.

Worcester Bosch 

When it comes to boilers, this manufacturer will always be found high up on any list. These are high-quality, reliable products that make them a well-recognised brand - but Worcester Bosch boiler prices generally end up being higher because of this.

Firebird 

Manufacturers of one of Europe’s most efficient oil fired boilers, Firebird are an innovative brand bringing heat efficiency to homes off the grid. 

Mistral 

With over 40 years of experience in manufacturing and developing oil fired boilers, Mistral are a UK market leader. 

Grant 

Grant has similar experience in the industry with over 40 years of making some of the most efficient oil fired boilers available in the UK today. 

Warmflow 

With over 50 years of experience in the industry, Warmflow is an award-winning manufacturer of oil fired boilers. They even boast production of the UK and Ireland’s first AA-rated combi boiler. 

To find the very best new oil boiler cost, we recommend comparing quotes as this gives you the best chance of finding the cheapest deal. 

HouseholdQuotes can help you find multiple, no-obligation quotes from qualified engineers in your local area. Giving you the opportunity to find the right heating engineer for your work, at the price to suit your budget. 

It’s completely free and could save you hundreds of pounds on your installation. If you’re ready to get started, simply click the link below!

Before choosing a boiler type, it’s good to know how much you might end up spending on bills. 

According to the latest available tariffs, as of 1st October 2023, the average price of oil is 9p per kilowatt hour. Therefore, if you were to run an oil combi boiler for up to 7 hours per day, for example, you would pay around £63.00.

In comparison, if you were to run a gas boiler you would be paying slightly less, at 6.9p/kWh.  

However, if your home is not connected to the gas grid, alternative options to an oil boiler include an electric boiler or a biomass boiler. Currently, these do cost more than oil, at 27.35p/kWh and 13.8p/kWh respectively. 

Below is an estimate of predicted annual costs for each fuel-type boiler. Please note that these costs are an estimate and will differ depending on the size of the home, the efficiency of the boiler and the expected energy usage levels. 

Currently, there are no government grants which help with the purchase of a new oil boiler. There is, however, some help available if you wish to replace an oil boiler with a renewable energy heating system. 

Moreover, the government plans to phase out fossil fuel systems. With oil and gas boilers banned, renewables and electrics might be the only choices for new homes as of 2025 and all homes a decade further down the line (although these plans might be subject to change).

For those considering a heat pump or gas boiler, check our our dedicated page where we compare the 2 heating systems.

This includes The Boiler Upgrade Scheme, which can help homeowners with the cost of upgrading to a heat pump or biomass boiler. The grant’s main aim is to encourage people to switch to a more efficient, low-carbon alternative. If you’re interested in this scheme, the government can offer up to £6,000 towards the cost of a renewable system if you meet the criteria. 

You may also be eligible to take part in the ECO4 scheme. This is a government-run initiative which obligates major energy suppliers to provide upgrades to the least energy-efficient homes. 

This could include installing insulation, first-time central heating or a renewable system.  

There are three different types of oil boilers on the market: combi, system and conventional.

A combi boiler is a compact, cost-effective option for homeowners with less than two bathrooms, as they are best suited to those with a lower hot water demand. Small combi boilers may be able to meet your needs comfortably, whilst also taking up minimal space.

These boilers take water from the mains to heat on demand. This means they don’t require an additional hot water storage tank, or cold water tank, installed in your home - saving vital space! 

Oil combi boiler costs can range from £1,300 at the lower end of the scale, up to £4,000+ for higher-end models.

Discover the best high flow rate combi boilers.

System boilers also draw their water supply from the mains, but unlike the oil combi boiler, store hot water in a cylinder. This is because they’re made for medium to large homes with multiple bathrooms and a higher hot water demand. Deciding whether you need a combi boiler or system boiler is mostly determined by this demand level.

System boiler costs range between £1,000 to £3,000 for the boiler supply only.

Conventional – as you may presume – are the oldest type of oil boiler, and are commonly seen in older properties. For these to work, you will need a lot of space for the various parts – a hot water cylinder, a water tank, and the boiler.

These kinds of boilers are usually only needed as a direct replacement for an existing conventional system. Due to all the additional parts, they are not recommended for new installation as the costs can be very high. Changing from conventional boiler to a combi, for example, will cost considerably more than a like-for-like swap since the additional units will need to be removed and the surrounding pipework will need to be adjusted.

A conventional oil boiler can cost anywhere between £1,000 to £3,500 for a replacement.

Determining which boiler fuel is best for you can often come down to two factors - location and cost. However, you might also want to consider the environmental or safety implications. 

Let’s compare these fuels and their best uses.

As modern gas boilers have advanced to achieve over 90% fuel efficiency, gas is still seen as the best money-saving choice.

This is another great choice for off-grid homes, which also offer fewer emissions than oil. On average LPG is also slightly cheaper than oil (although it can also fluctuate). 

One advantage of an electric boiler, however, is that it can often be paired with a renewable energy technology - such as solar panels. By generating your own energy to power the boiler, you don’t need to rely on an energy supplier and can end up paying very little to heat your home. You can learn more from our electric boiler vs gas boiler comparison page.

This option is considered to be eco-friendly because it removes the use of fossil fuels and reduces carbon emissions. It can however cost much more than gas or oil for wood products, and you need a considerable amount of storage space to keep a steady supply. 

The idea behind a hydrogen gas blend is to decrease the amount of natural gas being sent through the grid and substitute up to 20% of it with hydrogen. Hydrogen does not release carbon dioxide when it’s burned, so this would make all gas boilers emit less carbon.  

Each fuel option has its pros and cons, but what’s best for you can often be determined by what you can access in your area and how much you’re willing to spend. Luckily, more efforts are being made to reduce the environmental impact of boiler technology, so greener, cheaper alternatives may be around the corner! 

If you’re considering installing an oil boiler, or you’re debating new central heating costs, it’s important to weigh up the pros and cons before you make a decision. Here are some of the advantages and disadvantages for you to consider. 

1. High Energy Efficiency: Oil boilers are known for their high energy efficiencies of around 92%. 

2. Lower Running Costs: Compared to electric boiler prices, oil boilers typically come with lower running costs.

3. Accessible: Oil boilers are an ideal alternative for households outside of the gas grid. 

4. Supplier Flexibility: One of the perks of using oil boilers is the freedom to change your supplier at any time, allowing you to explore cost-effective options and potential savings.

5. Compatibility with Renewables: Oil-fired boilers can be integrated with renewable energy heaters, such as solar thermal systems, to reduce the environmental impact of heating.

1. Slower Hot Water: Oil boilers may have a slightly slower hot water delivery compared to some other heating systems, which could result in longer wait times for hot water.

2. Environmental Impact: They are not considered the most environmentally friendly option due to carbon emissions associated with burning oil, contributing to air pollution and greenhouse gas emissions.

3. Maintenance Requirements: Oil boilers require annual maintenance checks to ensure they operate efficiently and safely, adding to the overall cost of ownership.

4. Finite Oil Resources: Oil resources are projected to expire in approximately 40 years, which means that oil boilers will become unsustainable in the long term.

5. Potential Price Increases: Oil boiler prices in the UK can be subject to significant fluctuations, and there is a possibility of prices rising in the future.

If you’re living off the grid and looking to take advantage of everything an oil boiler has to offer, we can help you find the best price to get you started. 

Working with local engineers in your area, we can find you multiple quotes to compare so you can choose a price and an installer that suits your needs. 

Our quote services are completely free! And there is no-obligation attached, simply fill in a few details and we’ll do the leg work for you. Sit back and compare your quotes knowing you’re getting the best price offers around. 

Click the link below to find your new oil boiler! 

When it comes to installing your oil boiler, your tradesperson is likely to take these steps:

If you’re replacing an existing boiler, installation can take 1 day. However, if you have a more complex job like replacing a different boiler, or fuel, type, it can take up to 3 days. This will vary depending on your unique situation and the installer you choose.

Opting for a local installer may mean you have to wait a little longer for the availability, but this will save you money from the national installer who will be looking to recuperate their office and national advertising money through their fees. Where possible, try to pick a local trader to both support local companies and help save you a bit of money along the way.

As technology continues to develop, you can get more and more efficient oil boiler models to give you better heat distribution for your money. This is a key factor when considering upgrading or replacing your existing oil boiler, as older models are likely to be around 60% and 70% efficient versus the modern equivalent which should be between 92% to 93%.

You may be bound by a strict budget, which can help to make your choices easier as you will only have a limited pool of products to choose from. In these circumstances, it’s best to take into consideration all the above information on boiler size and efficiency to ensure you are getting the right size for your home and inhabitants while being of a good efficiency level to make sure you are spending your money wisely on a good model.

From our price comparison tables above, you can quickly and easily see what brand might fall into different budget types, with Firebird being the most cost-effective option from our selection, and Worcester Bosch being the most expensive.

If you live off the main energy grid and need an alternative energy type to heat your home, oil boilers are a viable option. Here’s our final checklist to make sure you consider everything when dealing with your upgrade:

Searching for the right heating engineer can be a difficult, time-consuming task that can take up hours or even days of your spare time. At HouseholdQuotes, we understand the importance of finding the right professional to meet your heating needs. That's why we've streamlined the process to make it as effortless as possible for you.

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