What Size Wood Burning Stove Do I Need?

Using our stove size calculator is the simplest way to calculate the wood burner size you need, plus you can take into account how well insulated your house is. You can also find out the appropriate wood burner size in kilowatts by:

  1. Calculate the cubic space of the room by multiplying the width, height and length.
  2. As a rule of thumb, divide the cubic space by 14 and this will give you a KW output needed for the room, considering how much heat is required based on factors like firebox size and type of fuel.
  3. If your room needs a wood burner between 4-6 KW then you need a small wood burning stove.
  4. If your room needs a wood burner between 7-9 KW then you need a medium wood burning stove.
  5. If your room needs a wood burner between 10-15 KW then you need a large wood burning stove. The maximum output of these stoves is crucial for ensuring they meet your heating needs effectively.
  6. Using our stove dimensions calculator you can also take into account if you like the room to be warmer than 20°C or not.

When choosing a wood burning stove it is difficult to know what size/KW output to go for to suit your home. First thing to note is that people often buy a stove that is really too big for their needs. Whilst it is tempting to just buy the largest stove possible and get ‘more bang for your buck’, this is rarely the best option. It is crucial to size wood burning stove correctly to ensure efficient heating and avoid potential combustion issues.

External air temperature can significantly affect the heating requirements and the size of the wood burning stove needed. For instance, at a zero-degree external air temperature, a specific amount of heating energy is necessary per unit volume of space, which helps in sizing the stove effectively.

First of all, any stove that you get which is over 5kw must have a permanently open air brick or ventillation kit installed in the room the stove is in to ensure adequate air flow (but it is recomended for any burning appliance of any size). Have you considered this when looking at larger wood burners?

Secondly, stoves have an optimal performance efficiency and to acheive this they need to be running at their nominal heat output. If they are running at less or more than this they become less efficient, meaning that you spend more on fuel and the exhaust is more damaging to the environment. Accordingly getting a stove with a nominal heat output that matches the dimensions of your room is the only way to go.

To get a better idea of the heat output you actually need from a wood burning stove, you can use our Heat Output Calculator. You should remember that this is only a guide and factors such as how well insulated your home is, other sources of heat and how open-planned the area is will affect the output that is needed.

You also need to consider the physical size of the wood burner Vs the space available. Of course the stove itself has to fit but you also need room for the 150mm of clearance to the sides and rear and 225mm to the front of your hearth for compliance with building regulations. Your stove will also have a tested safe clearance to combustible materials, so you should always check the dimensions of the stove and measure up before buying.

Once you have spent some time to consider what size of stove to buy you can then look through our range of wood burning stoves that will best suit you. Click here to view our extensive range of small 4-6kw wood burning stoves, medium 7-9kw wood burning stoves and large wood burning stoves from 10-15kw. You can get a great deal on our best-selling value log burners!

Understanding Heat Output

Stove heat output is a crucial factor to consider when choosing a wood burning stove. It refers to the specific measurements of a stove’s performance, usually expressed in kilowatts (kW). The heat output of a wood burning stove is determined by the size of the firebox, the type of fuel used, and the efficiency of the stove. A higher heat output means more heat is produced, but it also means more fuel is consumed. When selecting a wood burning stove, it’s essential to consider the heat output required for your specific needs. A general rule of thumb is to choose a stove with a heat output that is 7-10% of the room’s total floor area.

Sizing a Wood Burning Stove

Determining the correct size wood stove is crucial to ensure efficient and safe operation. A stove that is too small may not produce enough heat, while a stove that is too large may produce too much heat and be inefficient. To determine the correct size of a wood burning stove, you need to consider the room’s dimensions, insulation, and other heat sources. A general rule of thumb is to divide the room’s volume (length x width x height) by 14 to determine the required heat output in kW. You can also use a stove size calculator to help you determine the correct size of the stove.

When choosing a small stove, consider that it may not provide sufficient heat output, leading to increased fuel costs if the stove is underpowered. Additionally, take into account the insulation and airflow in the space to ensure optimal performance.

Factors Affecting Stove Size

Room Size and Layout

When determining the size of a wood burning stove, it’s essential to consider the room size and layout. The room’s dimensions, insulation, and other heat sources will impact the stove’s heat output and efficiency. A larger room with poor insulation may require a larger stove with a higher kW output, while a smaller, well-insulated room may be suitable for a smaller stove.

Other factors to consider include the room’s layout, such as the location of windows, doors, and any obstacles that may affect airflow. A room with many windows or doors may require a larger stove to compensate for heat loss, while a room with a more compact layout may be suitable for a smaller stove.

To determine the ideal stove size for your room, use a stove size calculator or consult with a professional. They will take into account the room’s dimensions, insulation, and other factors to recommend the perfect stove size for your needs.

Air Vent Requirements for Wood Burning Stoves

Air vent requirements are an essential consideration when installing a wood burning stove. A wood burning stove requires a constant supply of oxygen to burn fuel efficiently and safely. If the room is not well-ventilated, it can lead to poor combustion, reduced efficiency, and even safety hazards. A general rule of thumb is to install an air vent with a minimum diameter of 100mm for stoves with a kW output of 5 or more. For smaller stoves, a smaller air vent may be sufficient. It’s essential to consult with a professional to determine the correct air vent requirements for your specific installation.

Burning Stove Efficiency and Performance

Burning stove efficiency and performance are critical factors to consider when choosing a wood burning stove. A stove’s efficiency refers to its ability to convert fuel into heat, while its performance refers to its ability to produce heat consistently and safely. Look for stoves with high efficiency ratings (usually above 70%) and features such as secondary combustion systems and catalytic converters, which can improve efficiency and reduce emissions. Additionally, consider the stove’s maximum heat output, nominal heat output, and kW output to ensure it meets your specific needs.

Log Burner Considerations

Log burners are a popular type of wood burning stove, and there are several considerations to keep in mind when choosing one. First, consider the size of the log burner, as a larger burner may be needed for a larger room or for burning larger logs. Additionally, consider the type of fuel you plan to use, as some log burners are designed specifically for burning wood pellets or other biomass fuels. Finally, consider the efficiency and performance of the log burner, as well as its safety features, such as a secure door and adequate ventilation. By considering these factors, you can choose a log burner that meets your specific needs and provides efficient and safe operation.

Site Owner Responsibilities

As a site owner, it’s essential to ensure that your wood burning stove is installed and maintained correctly. This includes ensuring that the stove is installed by a qualified professional, following the manufacturer’s instructions, and maintaining the stove regularly.

Site owners are also responsible for ensuring that their stove meets local building regulations and safety standards. This includes installing a suitable air vent, ensuring proper clearance from combustible materials, and maintaining a safe distance from flammable objects.

By taking responsibility for your wood burning stove, you can ensure a safe and efficient heating solution for your home.

Final Installation Considerations

When installing a wood burning stove, there are several final considerations to keep in mind. First, ensure that the stove is installed on a suitable hearth or base, and that the surrounding area is clear of combustible materials.

Next, consider the stove’s kW output and ensure that it is suitable for your room size and layout. A stove with a kW output that is too high or too low may not provide efficient heating, so it’s essential to choose the right size for your needs.

Finally, ensure that the stove is installed with a suitable air vent or ventilation kit. This is essential for ensuring proper airflow and preventing the buildup of harmful gases.

By considering these final installation considerations, you can ensure a safe and efficient wood burning stove that provides years of reliable heating for your home.

25 comments

  1. According to your instructions ALL rooms of whatever size need a small woodburning stove.
    Is this really the case?

    1. Andrew Shuttleworth

      Certainly not, if you visit the Output Calculator on the Glowing Embers homepage, enter your room dimensions, this will calculate the range of KW you require. You will be surprised however how many people ‘oversize’ the stove they actually need as when it comes to wood burners, more is not better if the room does not require it

    2. Andrew Shuttleworth

      No, not at all. If you enter your room dimensions into the output calculator, the response varies depenging on the dims’ entered

  2. Before buy stove can u check for me please how much kw must be ?
    I have 4x small 600mm
    3x 2000mm
    And 4x 1000mm
    Thank u.

    1. Andrew Shuttleworth

      We would be more than happy to calculate that for you but could you clarify your room dimensions as L x W x H please

  3. Your calculation for stove sizing doesn’t mention if we are to measure in metres, feet inches etc.

    1. Andrew Shuttleworth

      Please follow the link below to take you to our Output calculator which will present you with the option of feet or metres:

      https://www.glowing-embers.co.uk/blog/output-calculator/

    2. Lucy OBryon

      24 feet X 32 feet X 14 feet high open space
      6 inches thick wall insulation. Concrete floor. What size and brand wood burning stove do you recommend?

      1. Andrew Shuttleworth

        In entering the given dimensions into our Heat Output Calculator (www.glowing-embers.co.uk/blog/output-calculator), it suggests you will need a stove with around 14kw output. Please feel free to view out large wood stoves in the link I have attached below. Do always confirm the size required with your HETAS registered installer however:

        https://www.glowing-embers.co.uk/stoves-by-kw-10-kw-15-kw-large-wood-stoves-c-69_84

  4. Steve Haithwaite

    Can I install a multi-fuel stove that has a 12kw output when the room only requires 9kw? Thanks Steve

    1. Andrew Shuttleworth

      I would only advise adding a couple of KW on top of what the sizing calculator tells you is required for your room size. When it comes to stoves, it is not a case of ‘getting more for your money’ by having a higher output stove than is required as it will either A) be too hot for the room making it unbearable to be in and/or B) you will not be running the stove at its optimum output whioch is also its optimum performance in terms of efficiency and cleanliness of combustion.

  5. jane purdie

    what size stove do i need for a room measuring 1,483.2160 cubic feet or 42 cubic meters please

    1. Andrew Shuttleworth

      If you enter the room dimensions (H x W x D) into our output calculator (link below), this will show you the recommended stove size for that living space

      https://www.glowing-embers.co.uk/blog/output-calculator/

  6. Joanne murray

    what size insert stove is required to heat 18 rads..The house is 130square metres

    1. Andrew Shuttleworth

      As a rule of thumb, you want to allow approx. 1.5kw per radiator so, using our Stove Search, you would need to be looking for boiler stoves with dedicated output to water of at least 27kw.

  7. Adrian Ratan

    Hi. I would like to buy an inset wood burner from you. KRATKI MAJA 8KW INSET WOOD BURNING STOVE – MAJA/PF
    Can you tell me please what is the minimum size for the flue liner in the chimney to be fitted for this product?
    Thank you

    1. Andrew Shuttleworth

      The Kratki Maja features an 8″ (200mm) diameter collar and so that is the minimum diameter for your flue system.

  8. Alan Orourke

    Hi Andrew my brother is moving house in a couple of weeks and has told me I can have his nester martin log burner its a few years old but in great nick it measures 620 wide by 700mm high ,I’ve calculated my room size as you advised on how to do and my room is 43.75 divided by 14 is 3.125 ,I’ve tried to have a look for the kW of yhe log burner but can’t find it ,do you think thus will be yo big many thanks alan

    1. Andrew Shuttleworth

      Nestor Martin are a very well-built stove brand so you have done well to inherit one! If you could provide me with your room dimenions (W x L x H) I could calculate the required KW more accurately for you. With regards to the suitability of this burner for your living space, are you able to see if the data plate is still attached to the rear or side of it? This would tell you the model name or code and the precise KW output of it.

  9. Anthony Walsh

    Hi I have a very old house 16th century with solid walls.
    My lounge measures 6m x 4.5m x 2.2m
    It’s a bit draughty with an open staircase and landing to one side.
    I’m looking to generate enough heat for this room and to help with sending some heat to the room above what KW would you suggest?
    Thank you

    1. Andrew Shuttleworth

      From having a look at your dimensions and the other information provided, our output calculator would advise a stove between 7 and 11KW would be ideal. Please find a link below to the calculator for your reference.

      https://www.glowing-embers.co.uk/blog/output-calculator/

  10. Kevin Liversage

    How do you calculate for a double sided stove? Is it the dimensions of both rooms? Or the biggest room?

    1. Andrew Shuttleworth

      You can do this by calculating the cubic space of the room by multiplying the width, height and length. As a rule of thumb, divide the cubic space by 14 and this will give you a KW output needed for the room. If you enter the room dimensions (H x W x D) into our output calculator (link below), this will show you the recommended stove size for the overall living space
      https://www.glowing-embers.co.uk/blog/output-calculator/

  11. Stephanie Roberts

    Hello,

    We wish to buy a multi-fuel burner for our back dining room in our Victorian end terrace. Room is 440cm long x 376cm wide x 226cm high and has a staircase leading directly up from the dining room. We were told by our sweep to get a 5kwt burner however could you please advise whether we get one that burns to a maximum output of 5kwt (such as the Firefox 5) or one that goes above? We’re interested in the Firefox 8 however as this burns up to 8kwt, would we need internal ventilation as I imagine this would be an additional cost at installation? We have a Tiger 5kwt in our lounge that we inherited and we don’t appear to have any internal ventilation for that. Looking to buy the burner asap so would appreciate your advice on this matter.

    1. Andrew Shuttleworth

      We have emailed you directly also but to address your enquiry regarding the ventilation, houses built before 2008 will require a permanently open vent into the room in the case of having a stove installed with over a 5kw output. An additional 550 mm2 of air ventilation is required per kw over 5, so in this case, you will need 1650mm2 of additional ventilation. Please see links below to our range of Rytons AirCore Ventilators (all of which state the mm2 of ventilation they provide) and our info page on air supply to stoves. I would always suggest discussing higher kw options with your installer prior to making your choice.

      https://www.glowing-embers.co.uk/air-bricks-ventilation-kits

      https://www.glowing-embers.co.uk/blog/air-supply-and-ventilation/

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