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Local and County Sligo orders made before 12.00 pm Wednesday 21st December will be delivered before 1.00 pm on Friday 23rd December. All nationwide orders made before midnight on Monday 19th December will be dispatched prior to Christmas. All orders made after that will be processed from 3rd January onwards. Happy Christmas!

Need a flue for your boiler?

Choosing the correct flue for a Grant oil boiler (or any boiler for that matter) is an important decision that will impact the performance, efficiency, and safety of your heating system.

A flue is a pipe that removes the combustion gases from your boiler and vents them outside your home. The correct flue is critical to ensure that the boiler operates safely and efficiently, and to avoid potential hazards such as carbon monoxide poisoning.

flue for boiler

Here are some key factors to consider when choosing the correct flue for your Grant oil boiler:

Boiler Type and Model:

The type and model of your boiler will determine the type of flue required. Grant oil boilers are available in different models, including external, internal, and combi models.

Each type of boiler requires a different flue configuration, so it is important to consult the manufacturer’s instructions to determine the correct flue for your specific boiler model. You can see the instructions for each model on the relevant product page here.

Grant Engineering have a number of colour coded systems too;

  • Grant Yellow Flue System (EZ Fit Internal Low Level Balanced Flue (yellow system))
    • Suitable for internal Grant Vortex boilers up to 70kW
    • Extensions available
    • Optional plume diverter (max height 6 meters)
  • Grant Blue Flue System (EZ Fit Blue Single Wall Flue Kit)
    • Single wall stainless steel in 80mm & 100mm
    • Plume diverter 1m kit or a 2m telescopic kits
    • Extensions available
  • Grant White Flue System (EZ Fit Flue Internal High Level Balanced Flue (White System))
    • Suitable for internal Grant Vortex boilers up to 70kW
    • Extensions available
    • Flue may be extended horizontally and vertically
  • Grant White Flue System (EZ Fit Flue Internal Vertical Balanced Flue (White System))
    • Suitable for internal Grant Vortex boilers up to 70kW
    • Extensions available
    • Supplied as a complete kit (3 meters inside with a further 1 meter terminal
  • Grant Orange Flue System (EZ Fit Vertical Conventional Flue (Orange System))
    • Suitable for Grant Vortex boilers up to 70kW
    • Can be installed into existing chimneys
    • Quick & easy to install
  • Grant Green Flue System (EZ Fit External Flue (green system) for outdoor boilers)
    • Suitable for Grant external boilers
    • Starter connections available
    • Possible to create offsets in straight flue runs by using our 45° bends and extensions.

Flue Size:

The size of the flue will depend on the size of the boiler and the length of the flue run. The flue size must be large enough to handle the volume of combustion gases produced by the boiler.

If the flue is too small, it can result in poor combustion and reduced efficiency. If the flue is too large, it can lead to excessive heat loss and reduced efficiency. You can see our various options here and you can contact us at any time if you need help and advice – just get in touch!

Flue Material:

The material used for the flue will depend on the type of boiler and the flue configuration. The most common materials used for flues are stainless steel, PVC, and polypropylene. Stainless steel is durable and corrosion-resistant, making it a popular choice for external flues. PVC and polypropylene are lightweight and easy to install, making them ideal for internal flues. Almost all oil boilers will have recommended flues so these will have been designed and constructed by the manufacturer to suit the particular model.

Flue Location:

The location of the flue is also important to consider. An external flue will require a suitable location on the outside of your home, away from windows and doors. An internal flue will need to be installed in a suitable location, such as a chimney or flue shaft. It is important to ensure that the flue is installed in a safe and accessible location to allow for regular maintenance and inspections.

You can see all of our various flues available here.

Building Regulations:

It is important to ensure that the flue installation complies with building regulations and safety standards. The installation must be also carried out by a qualified and registered heating engineer who is familiar with the regulations and standards for flue installations.

You can source a qualified installer through the likes of the OFTEC website here.

Choosing the correct flue for your Grant oil boiler is a critical decision that requires careful consideration of several factors, including the boiler type and model, flue size, material, location, and building regulations.

Consult the manufacturer’s instructions and seek the advice of a qualified heating engineer to ensure that your flue is installed safely and correctly, and to ensure that your boiler operates at maximum efficiency and safety.

You can call us anytime for help and advice too. Once the correct flue is established then we can dispatch it quickly to you anywhere in Ireland – both north and south!

  • Grant Vortex External Oil Boiler 90-120 (26-36kw)

    Grant Vortex Condensing Module 90-120 (26-36kw) Oil Boiler

    Key features:

    • High Efficiency rating
    • Trusted brand
    • 26-36kW Power Output
    • Ideal when space is at a premium
    2,150.40 (Inc. VAT)
  • Grant Vortex Boilerhouse Oil Boiler 50-90 (15-26kw)

    Grant Vortex Condensing Oil Boiler Boiler House 50-90

    Key features:

    • Highly efficient Oil Boiler
    • Trusted brand
    • 50-90 model with 15-26kW Power Output
    • Easy to install
    • Ideal for use in house that is under 2500 square foot
    1,531.77 (Inc. VAT)
  • Grant Vortex External Oil Boiler 50-90 15-26kw

    Grant Oil Boiler Vortex Outdoor Condensing Module 50-90 (15-26kw)

    Key features:

    • Highly efficient free standing external Oil Boiler
    • Trusted brand
    • Features a Riello RDB Burner
    • Includes a factory fitted frost thermostat preset to 2°C
    1,785.00 (Inc. VAT)
  • Grant Vortex Utility Condensing Indoor Oil Boiler

    Grant Vortex Indoor Utility Free Standing Oil Boiler

    Key features:

    • High efficiency range of free standing indoor condensing oil boilers
    • Designed for utility and kitchen installation
    • Range of sizes available
    • A Energy Rating
    • One of the most efficient oil boiler on the market today.
    1,929.872,888.04 (Inc. VAT)
  • Grant Euroflame Boiler House Oil Boiler

    1,340.701,562.10 (Inc. VAT)
    Shop options

    Grant Euroflame Boiler House Oil Boiler

    Euroflame Boiler House Oil Boiler

    Key features:

    • High quality economical Boiler House Oil Boiler range
    • High efficiency SEAI HARP ‘A’ Rating
    • Suitable for balanced or conventional flue application
    • Compact design supplied with factory fitted blue insulated jacket
    • Fully approved to OFTEC Standard and EC directives
    1,340.701,562.10 (Inc. VAT)
  • Grant Vortex Indoor Combi Oil Boiler

    3,090.993,316.08 (Inc. VAT)
    Shop options

    Grant Vortex Indoor Combi Oil Boiler

    Indoor Combi Oil Boiler from Grant

    Key features:</strong>

      <li>Highly efficient indoor combi oil boiler with A rating

    • Offers instant production of hot water
    • Cost effective installation
    • Unique drop-down control panel for ease of servicing
    3,090.993,316.08 (Inc. VAT)
  • Grant Vortex Boilerhouse Oil Boiler 120-155 (36-46kw)

    Grant Vortex Condensing Oil Boiler Boiler House 120-155

    Key features:

    • Highly efficient Oil Boiler
    • Trusted brand
    • 120-155 model with 36-46kW Power Output
    • A Energy rating
    • Easy to install
    2,177.10 (Inc. VAT)
  • Grant Euroflame Outdoor Condensing Oil Boiler

    1,672.801,998.75 (Inc. VAT)
    Shop options

    Grant Euroflame Outdoor Condensing Oil Boiler

    Grant Euroflame Outdoor Boilers

    Key features:

    • Great value free standing economical condensing boiler
    • Incorporates a new version of the Grant Vortex stainless steel heat exchanger
    • Extremely efficient with an A rating
    • Comes complete with a factory fitted multi-directional flue
    • Optional side or rear flue exits
    1,672.801,998.75 (Inc. VAT)
  • Grant Vortex Combi Oil Boiler (outdoor)

    3,041.003,423.09 (Inc. VAT)
    Shop options

    Grant Vortex Combi Oil Boiler (outdoor)

    Outdoor Combi Oil Boiler from Grant

    Key features:

    • Highly efficient condensing outdoor oil boiler with A energy rating
    • Offers instant hot water production on demand
    • Provides cost effective installation
    • Comes complete with a factory fitted multi-directional flue
    • Powder coated
    • Unique drop-down control panel for ease of servicing
    3,041.003,423.09 (Inc. VAT)
  • Grant Euroflame Indoor Condensing Oil Boiler

    Indoor Oil Boilers – Grant Euroflame

    Key features:

    • High quality and great value Condensing Oil Boiler
    • Oil boiler designed for utility and kitchen installation
    • Incorporates a new version of the Grant Vortex stainless steel heat exchanger
    • Extremely efficient having achieved an SEAI HARP ‘A’ & SEDBUK ‘A’ Rating
    1,841.31 (Inc. VAT)
  • Grant Vortex External Oil Boiler 120-155 (36-46kw)

    Grant Vortex Condensing Module 120-155 (36-46kw) Oil Boiler

    Key features:

    • High Efficiency rating
    • Trusted brand
    • 36-46kW Power Output
    • Ideal when space is at a premium
    2,464.31 (Inc. VAT)
  • Firebird Envirogreen Slim Heatpac C26 Oil Boiler

    Firebird C26 Enviromax Slimline Heatpac Condensing Oil Boiler

    Key features:

    • External Oil Boiler with no need for building
    • Trusted brand
    • Highly Efficient
    • Use 25% less fuel than non-condensing boilers
    1,737.58 (Inc. VAT)

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