How to choose the best oil boiler for your home

Choosing the right heating solution is crucial for any homeowner, especially when considering efficiency, cost, and the environment. While various heating systems like gas, electric, and renewable options are available, oil boilers remain a reliable choice for many homes. This guide will help you understand why an oil boiler might be the best solution, compare some of the top models on the market, and answer some common questions.

What are oil boilers?

Oil boilers are used primarily for heating homes and providing hot water. They are especially common in areas where access to natural gas is limited or unavailable.

Here’s a closer look at what oil boilers are used for:

• Home heating: Oil boilers heat water, which is then circulated through radiators, underfloor heating systems, or other heating devices throughout the home. This process provides a consistent and reliable source of warmth, keeping indoor spaces comfortable even in colder weather.
• Hot water supply: In addition to heating the home, oil boilers also provide hot water for daily use, including bathing, washing dishes, and laundry. They heat water on demand or store it in a hot water cylinder for later use, depending on the boiler type.

• Heating large properties: Oil boilers are particularly effective for heating larger homes and properties, such as country houses, farmhouses, or rural buildings, where other heating options might be less effective or more expensive.
• Off-grid locations: Oil boilers are commonly used in rural or off-grid locations where access to mains gas is not available. They offer an efficient alternative to electric heating, which can be more costly in these settings.
• Reliable backup heat source: Some households use oil boilers as a backup heat source, especially in regions with frequent power outages, as they can run on stored oil rather than relying on electricity.

Why Choose an Oil Boiler?

Oil boilers offer a dependable and efficient way to heat your home, especially in areas where gas is not available. They are known for their high efficiency and ability to heat large homes quickly. Modern oil boilers come with advanced features, such as condensing technology, which extracts additional heat from the fuel, making them highly efficient. When compared to electric or gas systems, oil boilers often provide lower running costs and are particularly suited for homes with existing oil heating systems.

Product Comparison

Understanding the Difference: Combi Boilers vs. Vortex and Euroflame Models

When choosing the right oil boiler for your home, it’s essential to distinguish between different types and models. Combi boilers and traditional models like the Grant Vortex and Euroflame each offer unique advantages and features.

Combi Boilers are designed to provide both heating and hot water from a single compact unit, eliminating the need for separate water tanks or cylinders. This makes them an excellent choice for homes where space is limited. Combi boilers, such as the Grant Vortex Indoor and Outdoor Combi Oil Boilers, deliver hot water on demand directly from the mains, ensuring there is no waiting time. They are particularly space-efficient and often feature high efficiency ratings, which can lead to cost savings and reduced environmental impact.

On the other hand, the Grant Vortex Boilers are renowned for their high efficiency and advanced technology. Launched in 2001, the Vortex range has set a benchmark with its efficiency levels ranging from 92.6% to 97%. These boilers feature a larger heat exchanger area, which contributes to their superior efficiency. The Vortex models are equipped with a stainless steel heat exchanger covered by a five-year guarantee, reflecting their durability and long-term reliability. With 28 model variants available, the Vortex range caters to a wide range of heating needs, from small homes to larger properties.

The Grant Euroflame Boilers were introduced to meet the demand for a more cost-effective option without sacrificing too much on efficiency. The Euroflame range achieves efficiency levels between 92.1% and 93%, making it a slightly less efficient but more affordable alternative compared to the Vortex. Despite the lower efficiency, Euroflame boilers still offer reliable performance and incorporate features such as the stainless steel heat exchanger and factory-fitted internal condensate traps. With nine model variants, the Euroflame range provides a versatile choice for various home sizes and budgets.

Let’s delve into the most searched products:

Grant Euroflame Outdoor Condensing Oil Boiler 26kW (90) or 36kW (120)  

This model is an economical and efficient choice, designed for outdoor installation.

It features a Grant Vortex stainless steel heat exchanger and a Riello RDB burner, ensuring high efficiency with an ‘A’ rating.

The Euroflame is ideal for homes with up to 16 radiators, providing a power output of 15-26kW. It includes a factory-fitted multi-directional flue with optional side or rear exits, making it versatile for different installation requirements.

Grant Vortex External Oil Boiler 50-90 15-26kW

A highly efficient outdoor boiler, the Grant Vortex External Oil Boiler 50-90 is perfect for homes needing a dependable heating solution.

With a power output of 15-26kW, it offers the same high efficiency as other Grant models and includes a Riello RDB burner and a factory-fitted frost thermostat preset to 2°C.

This boiler is particularly suitable for homes with up to 16 radiators and features a compact design for easy installation.

Grant Vortex External Oil Boiler 120-155 36-46kW

Ideal for larger homes, this powerful oil boiler provides a high output of 36-46kW.

Its compact design makes it perfect for outdoor installations where internal space is limited.

It also features the unique Grant Vortex heat exchanger, which maximizes efficiency and offers a whisper-quiet operation.

This model is fully approved to OFTEC Standard and EC directives, making it a robust choice for homes needing significant heating power.

Grant Vortex External Oil Boiler 90-120 26-36kW

This model is designed for homes up to 3500 square feet and can handle up to 20 radiators.

Offering an output of 26-36kW, it combines high efficiency with a whisper-quiet operation, making it ideal for outdoor installation.

The Vortex 90-120 is also equipped with a Riello RDB burner and factory-fitted frost protection, ensuring reliable performance even in colder conditions.

Grant Vortex Boilerhouse Oil Boiler 50-90 15-26kW

Perfect for garage or boiler house installations, this budget-friendly option is easy to install and highly efficient.

With a power output of 15-26kW, it’s suitable for homes under 2500 square feet (or up to 16 radiators).

It includes a Grant Vortex heat exchanger, factory-fitted blue insulated jacket, and is compatible with balanced or conventional flue applications, offering great versatility.

Grant Vortex Indoor Combi Oil Boiler 26kW (90) or 36kW (120)

The Grant Vortex Indoor Combi Oil Boiler offers high efficiency with an SEAI HARP ‘A’ rating, combining heating and hot water in one unit.

Its unique drop-down control panel simplifies servicing, and the high-quality nickel-plated internal pipework ensures durability.

Ideal for homes needing instant hot water, it provides a cost-effective installation solution and reliable performance.

Grant Vortex Outdoor Combi Oil Boiler 26kW (90) or 36kW (120)

The Grant Vortex Outdoor Combi Oil Boiler is a highly efficient, condensing model with an SEAI HARP ‘A’ rating.

It delivers mains pressure hot water on demand and features a factory-fitted multi-directional flue for flexible installation.

The powder-coated exterior withstands the elements, and the drop-down control panel makes servicing straightforward.

Perfect for homes with limited indoor space, this model combines efficiency with durability.

Here’s a detailed comparison of the oil boiler models to help you choose the best one for your needs:

Our Recommendation

For homes with up to 16 radiators or those requiring a reliable and efficient outdoor boiler, the Grant Vortex External Oil Boiler 50-90 15-26kW is an excellent choice. It combines high efficiency with a compact design and comes equipped with a factory-fitted frost thermostat for added protection in colder months.

For larger properties or those needing greater heating power, the Grant Vortex External Oil Boiler 120-155 36-46kW stands out with its high output and whisper-quiet operation. Its robust performance and compact design make it suitable for installations where internal space is limited.

If you seek a budget-friendly option without compromising on efficiency, the Grant Euroflame Outdoor Condensing Oil Boiler 26kW (90) or 36kW (120) offers excellent value. It features a stainless steel heat exchanger and versatile installation options, making it ideal for homes with up to 16 radiators.

For those needing an all-in-one solution, the Grant Vortex Indoor Combi Oil Boiler 26kW (90) or 36kW (120) provides both heating and instant hot water. Its cost-effective installation and user-friendly features, including a unique drop-down control panel, make it a practical choice for indoor installations.

What about flues and accessories?

In certain installations, flues and their accessories are essential for optimal performance and safety. The Grant Balanced Low Level Flue Kit EZ200IRL, suitable for units between 26kW and 70kW, features self-sealing ducts and a quick-fit clamp system for streamlined installation. It includes a durable stainless steel terminal guard and a compact flue terminal design to reduce condensate staining. Compatible with various Grant boiler models, this kit offers versatility across different installations.

For managing flue gases effectively, the Grant Plume Diverter Kit GPD200 is a valuable addition. Designed for use with the EZ200 or EZ200S balanced flues, this 100mm by 1 metre kit is ideal for units with a power output of 26-70kW. It comes with essential components such as starter and terminal elbows, flue pipes, and an adjustable wall bracket, ensuring efficient gas diversion and preventing plume re-circulation.

Frequently Asked Questions

What is a condensing boiler and why is it more efficient?

Condensing boilers are designed to capture and reuse heat that would otherwise be lost through the flue. By cooling the flue gases to below their dew point, these boilers recover latent heat, achieving high efficiency levels. This process allows condensing boilers to use energy more effectively than standard models.

Can condensing oil boilers be used with different types of oil?

Condensing oil boilers are specifically designed to run on kerosene. Some models, like those from Grant, are also compatible with HVO (Hydrotreated Vegetable Oil) biofuel, offering a sustainable option that can future-proof your heating system.

Should I install a frost stat on my boiler?

For outdoor boilers, installing a frost stat is advisable. The Grant Vortex Module range includes a factory-fitted frost stat set at 1.5°C to prevent freezing. Additional protection can be achieved by fitting a pipe thermostat on the return pipe.

What should I do to prevent my condensate trap from freezing?

To avoid freezing, ensure that the condensate pipe is directed into a larger diameter soil stack rather than a smaller waste pipe. If the pipe is not adequately insulated, removing the bung from the condensate trap can help.

Can I use my existing flue with a new condensing boiler?

Typically, existing flues are not compatible with new condensing boilers due to their lower flue gas temperatures and potential moisture buildup. A new, properly sealed Grant-approved flue system is usually required.

What is flue “pluming” and how can it be managed?

Pluming occurs when the low-temperature flue gases from a condensing boiler create a visible plume of water vapour. To manage this, consider installing a high-level, vertical, or plume diverter kit flue to direct the vapour away from windows and sensitive areas.

Can I use Grant EZ-Fit flues with top or side exits?

Yes, Grant EZ-Fit flues are versatile and can be configured for rear, side, or top exits, allowing for flexible installation based on your specific needs.

How do I choose the right size boiler for my home?

Choosing the right size boiler depends on the size of your home, the number of radiators, and your hot water needs. A professional installer can help you determine the correct size.

Are oil boilers efficient?

Yes, modern oil boilers are highly efficient, with many models achieving efficiency ratings of 90% or higher. Condensing technology further improves this by using the waste heat in the flue gases.

Can I install an oil boiler myself?

No, oil boilers must be installed and commissioned by a qualified professional to ensure safety, compliance with regulations, and optimal performance.

How often should I service my oil boiler?

It is recommended to service your oil boiler annually to maintain efficiency, safety, and prolong the life of the unit.

Is it expensive to run an oil boiler?

Running costs depend on oil prices, your boiler’s efficiency, and your home’s insulation. Modern condensing oil boilers are more economical due to their high efficiency.

By carefully selecting the right oil boiler for your home, you can ensure efficient, reliable heating that keeps your home warm throughout the year.

Our friendly and knowledgeable staff are always here to help you choose the best option for your needs.

Whether you need expert advice or assistance with your purchase, we’re committed to providing top-class customer service every step of the way.

Get in touch with us today to find the perfect oil boiler for your home!