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Last updated: 13 March 2024

Best Oil Boiler for Your Household in the UK 2024

Best oil boilers

Even though gas boilers are the most popular home heating solution available in the UK today, there are millions of homes that do not have access to the gas grid. If this is also the case for your home, you will need to consider other options, such as oil boilers. Undoubtedly, you will also want to know what the best oil boiler for your household would be.

Some of the best oil boilers for home heating in the UK today are: 

  • Worcester Bosch Heatslave II Combi (output sizes range from 12 to 32 kW): Most highly reviewed oil boiler brand.  
  • Warmflow Utility HE Combi (output sizes range from 15 to 26 kW): Cheapest oil boiler model. 
  • Grant VortexPro (output sizes range from 15 to 26 kW): Best oil boiler in terms of versatility, as it comes in combi, system, and regular models. 

However, this list is only the beginning. In this article, you can learn more about: 

  • What types of oil boiler there are
  • Choosing the best oil boiler for your home
  • What the most efficient oil boilers are
  • Oil boiler reviews this year
  • How to find an installer for your new oil boiler

Picking the right boiler for your home is only the first step towards enjoying the benefits of high-quality home heating. What you will need to consider next are central heating prices. To ensure that you are not overspending on these costs, you will want to work with a reliable professional for the oil boiler installation process. 

Finding the right installer can be a tedious task involving hours or even days of research. Doing this alone can prove to be frustrating and you might not even find what you are looking for. Fortunately, you can avoid wasting your time and energy and get the process of finding a reputable installer started in just 30 seconds.

Simply click below and fill in our short form. We will then put you in touch with up to 3 local heating engineers from our broad network of specialists. They will offer you quotes for their services, which you can compare to find the best deal for your new oil boiler installation. Get started today and request free, no-obligation quotes!

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How did we choose the best boilers?

In compiling our list of the best oil boilers on the market today, we weighed in several factors, such as: 

Best oil boilers criteria
  • Price-quality ratio: We understand that you don’t want to overspend on a new oil boiler. But you also don’t want to compromise on appliance quality. That is why we took into consideration the performance of each boiler model and compared it to the oil boiler prices on the market today. 
  • Warranty period: The amount of time you can enjoy the services of a boiler manufacturer is crucial when choosing the right appliance for your home. In our list, we have included boiler brands with long warranty periods, to help you choose an oil boiler that you can benefit from for longer. 
  • Power output capacity: The boiler size you will require depends on the size of your home. However, to make sure that you can find an oil boiler that would suit your home well, we included boiler models with a wide range of boiler sizes. 
  • Manufacturer reliability: We have only listed highly-regarded boiler manufacturers with decades of experience with providing households with quality home heating solutions. By choosing a boiler from a well-established company, you are guaranteed to find high-quality and durable products for your home. 
  • Customer reviews: One of the most important aspects to consider when choosing a new oil boiler are the reviews of the appliance left by other homeowners. That is why we have only selected boiler brands with high Trustpilot reviews for our list. 

Best regular oil boilers

When it comes to regular (also known as conventional) oil boilers, some of the best ones available in the UK today are:

1. Worcester Bosch Danesmoor

This regular boiler model comes in a variety of power output sizes, making it a great option for almost any household. You can also find this model as a system boiler. Typically, the Worcester Bosch boiler cost is higher than that of other brands, but the high quality and reliability of such an appliance makes up for it. Some key features of the Worcester Bosch Danesmoor are: 

  • Output sizes range from 12 to 32 kW
  • Efficiency rating of around 95%
  • Warranty of up to 10 years
  • Price range: £1,450 – £2,300

2. Grant VortexBlue

Grant’s VortexBlue regular boiler can easily attend to the energy needs of small to medium homes. This model is known for its reliability and exceptionally quiet operation. Here are some of the characteristics of this boiler model:

  • Output sizes range from 15 to 26 kW
  • Efficiency rating of around 93%
  • Warranty period of up to 10 years
  • Price range: £1,900 - £2,100

3. Mistral Kitchen Utility Classic

While it will take up some space with its water storage tank and hot water tank, this oil boiler unit is designed to be compact and fit easily under a kitchen counter. Available in a wide range of sizes, the Mistral Kitchen Utility Classic is great for small, medium, and large homes. Here are some of its main features:

  • Output sizes range from 21 to 41 kW
  • Efficiency rating of about 92%
  • Warranty period of 5 years
  • Price range: £2,000 – £2,800

Best system oil boilers

Keeping in mind system boiler prices, we have selected some of the best system oil boilers with a great cost-performance ratio. These include: 

1. Firebird Envirogreen

This appliance has been designed to be a compact system oil boiler. This model is available as both an internal or external oil boiler, making it a great option for saving space in your home. Some of the Envirogreen’s key features include:

  • Output sizes ranging from 12 to 40 kW
  • Efficiency rating of about 93%
  • Warranty period of up to 10 years
  • Price range: £1,500 – £2,600

2. Warmflow Utility HE

Warmflow oil boilers are known for their durability, and this system boiler model is no different. This high-quality appliance can tend to the energy needs of medium-sized homes with ease, having the following specifications:

  • Output sizes ranging from 21 to 26 kW
  • Efficiency rating of over 90%
  • Warranty period of up to 7 years
  • Price range: £1,600 - £2,000

3. Grant VortexEco

This highly efficient system boiler comes in a variety of output sizes, giving homeowners plenty of options depending on the size of their homes. With a high efficiency rating, the VortexEco can easily attend to your household’s needs while wasting little oil to warm up your home. Some additional features of this boiler model are:

  • Output sizes range from 16 to 35 kW
  • Efficiency rating of about 93%
  • Warranty period of up to 10 years
  • Price range: £1,500 - £2,000

Best combi oil boilers

While the combi boiler prices you will see listed below may seem higher than the figures mentioned above for other boiler models, you can rest assured that the quality of these combi boilers is worth the cost. Some of the best oil combi boiler options you could pick for your home are:

1. Worcester Bosch Heatslave II

This combi boiler model is designed to be compact and easily fit in a kitchen cupboard. It’s also available as an external model, ensuring that you can save even more space within your home. The wide power output range of the Heatslave II makes it suitable for small, medium, and large homes. In addition, these are some of its main characteristics:

  • Output sizes rage from 12 to 32 kW
  • Efficiency rating of about 95%
  • Warranty period of up to 10 years
  • Price range: £2,400 – £2,800

2. Firebird Envirogreen

Like its system oil boiler counterpart, the Envirogreen has a compact design. This model can be installed either as an internal or external oil boiler, allowing you to maximise the space in your home. Other qualities of this oil boiler include:

  • Output sizes ranging from 20 to 35 kW
  • Efficiency rating of 93%
  • Warranty period of up to 10 years
  • Price range:  £2,200 – £2,600

3. Grant VortexPro

Available as internal or external oil boilers, the models in this range have an exceptionally compact design, making it great for homes with little space. Even though they are small in physical size, they pack quite the output size. Some features that make the VortexPro one of the best combi oil boilers are:

  • Output sizes ranging from 21 to 36 kW
  • Efficiency rating of around 95%
  • Warranty period of up to 10 years
  • Price range: £2,000 – £3,000

To determine whether a combi, system, or regular boiler would be best for your home, you will have to establish your energy consumption requirements. In need of help with determining which kind of oil boiler would best attend to your household’s needs? Then you will want to consult a heating engineer who can offer you tailored advice. 

Getting in touch with a professional is extremely easy with our quick form. In just 30 seconds, you can request quotes from up to 3 local installers. You can then choose a specialist who can answer all your questions about oil boilers and find the best deal on installation costs for your home. No need to spend hours looking for an installer - just click below to get started.

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Which is the best? External or internal oil boiler

Internal vs external oil boiler

As the names for these types of boilers suggest, external oil boilers are located outside of your home, whereas internal oil boilers are fitted inside. 

Internal oil boilers are installed like any other boiler - in a cupboard or utility room. Depending on whether you have a combi, system, or regular oil boiler, it can take up more or less space inside your home. Regardless of boiler type, internal oil boilers are still more compact than external ones. 

External oil boilers, on the other hand, are generally installed in a shed or garage and supply hot water to your home via additional pipework. This kind of oil boiler needs to be installed outside the home because it is generally larger and more powerful than internal oil boilers. 

When deciding which option is the best for your home, you will need to consider 2 main factors: cost and space. External oil boilers are both more expensive and take up more space (albeit outside of your home) due to their larger size. In comparison, internal oil boilers are more cost-effective. They are also compact, but they might still take up quite a bit of space if you require a system or regular boiler. 

Best oil boiler for a small house

In a smaller home, one thing that is greatly valued is space. As a result, the best kinds of boilers for this kind of living situation are combi boilers. They are compact and can easily tend to the energy consumption requirements of a smaller household.

For a better idea of what the best oil combi boiler for your home would be, you can check the combi boiler models we have listed above. In addition to the boiler model and manufacturer, you will also need to consider the power output you need.

Best oil boiler for a large house

Larger homes require greater power output from their boilers. In some cases, an oil combi boiler might be good for the job. However, they are generally not well suited for higher energy needs.

As a result, the best oil boiler for a large house would be either a system or a regular boiler, as they can easily attend to high energy consumption requirements. For a better idea of which regular or system oil boilers are the best in the UK today, you can consult the lists we have compiled above.

No clue which type of oil boiler would be best for your home? Not to worry. A heating expert can help you determine which oil boiler size or type you would need to make the most out of your home heating system.

Finding a reliable professional to consult can be quite the hassle, involving hours of tedious research. Thankfully, we have done the hard work for you and vetted heating experts operating across the country.

All you have to do to get in touch with specialists from our network is to click below and fill in our 30-second form. You will then hear back from up to 3 boiler installers in your area and receive quotes for their services. Then, you can compare prices to find the cheapest heating system for your home and decide which installer you want to work with. 

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Most efficient oil boiler

To make the most of your home heating system, you will want to make sure that you install a highly efficient oil boiler. Boiler efficiency is a crucial factor to keep in mind when choosing your appliance, as it indicates how well fuel is converted into usable energy for your home.

Boiler efficiency is calculated as a percentage. Today, oil boilers have an efficiency rate of around 92–95%. This means that only 5-8% of the oil used to fuel your appliance is wasted in the process of being converted to energy, making them a highly-efficient home heating solution. 

In terms of the most efficient oil boiler models on the market, all the options we have mentioned above have high efficiency ratings. However, some of the oil boiler models that stand out are the Worcester Bosch Heatslave II and the Grant VortexPro with efficiency rates of as high as 95%. 

With efficient oil boilers such as these, you are guaranteed to enjoy the benefits of a quality oil boiler, as well as avoid overspending on your annual heating bills.

Which oil boiler brand is the most reliable? Oil boiler reviews in 2024

When it comes to choosing a high-quality oil boiler, you have several great options. Below you can find an overview of some of the most reliable boiler manufacturers that offer oil boilers. Each of these brands offers combi, system, and regular boilers, as well as both internal and external oil boilers. 

The table includes their warranty periods, their rating from Trustpilot reviews, as well as their estimated cost. 

Boiler BrandWarranty PeriodTrustpilot ReviewsEstimated Cost (Excluding Installation)
Worcester Bosch Up to 10 years4.6 / 5£1,700 - £4,000
Firebird Up to 10 years4.3 / 5 £1,100 - £3,500
Mistral 5 yearsN / A £1,100 - £5,000
Grant Up to 10 years4.1 / 5 £1,500 - £3,500
Warmflow Up to 7 years4.3 / 5£1,300 - £4,200

An oil boiler from any of the manufacturers listed above would make a great option for your home, as these are the most reputable and trusted brands on the market today. Not only do they have several years of experience with providing quality home heating solutions, but they are also highly regarded by thousands of satisfied customers. 

For a better idea of the figures listed above and how they compare to what other manufacturers offer, you can also check the following:

Find the best oil boiler quotes & installers for your UK home

If you are ready to install an oil boiler in your home, you will also want to make sure that you are not overspending on your new home heating system. That is why, before making your purchase, you should be mindful of two key factors: the boiler grants available in the UK and the installer you choose to work with. 

In terms of grants, you could apply for the ECO4 (Energy Company Obligation) Scheme if you live in England, Scotland, and Wales. In Scotland, you can also potentially benefit from the Warmer Homes Scotland grant. Before applying for any of these grants, you will want to check the eligibility criteria they have. 

When it comes to choosing the installer who will work on your home, the importance of finding a highly-qualified and reliable specialist cannot be overstated. Not only will their work have a direct impact on the comfort of your home, but their work will influence your new boiler cost

Looking for reputable installers on your own can be a pain. You’d need to read endless reviews and try to find up-to-date information on installation costs. This could take hours or even days of your time. Fortunately, you can skip this tedious process entirely and instead get in touch with trusted heating engineers from our network. 

All you need to do to get started is fill in our 30-second form to request quotes for a new oil boiler installation. You will then hear back from up to 3 installers near you who will provide you with the costs of their services. By comparing the figures you receive, you can determine which installer offers the best deal for a new oil boiler for your home. 

Simply click below and request free, no-obligation quotes now!

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