It is important to have a stove that is the right size for the room it is going into. Too big can be just as bad as too small. It is often better to have a smaller stove working hard than to have a larger one that is just chugging away.
This calculator will give you the approximate size in kilowatts of the stove that is right for your room. It is not an exact result and should be taken as a guide only. Many other factors, such as the number of windows, double glazing, cavity wall insulation, wood quality, central heating and personal preference will also affect the size required.
For more information, please come in and see us in our showroom.
Wood-Burning Stove kW Calculator
Estimate required useful stove output (kW). This is a practical estimate — for exact sizing use a full heat-loss survey.
Notes: formula is an engineering heuristic. For open-plan spaces, large glazed areas, exposed walls, or multi-room heat distribution, increase the margin or obtain a full heat-loss calculation.
Insulation Overview
Before selecting a stove, evaluate how effectively your home holds warmth.
- Poor insulation: Homes built before roughly 1950 or those with single-pane windows, noticeable drafts, and minimal loft or wall insulation typically lose heat rapidly.
- Moderate insulation: Common in properties from the 1990s, where double glazing and partial insulation provide a middling level of heat retention.
- High insulation: Newer homes constructed from around 2008 onward are generally built to be airtight and meet modern thermal standards, allowing them to maintain heat efficiently.
How to calculate the kw heat output required for a room manually?
To determine the room’s cubic space, multiply its width, height, and length. As a general guideline, divide the resulting cubic space by 14 to obtain the required kilowatt (KW) output for the room.
What should I bare in mind when choosing a log burner?
Consider the insulation quality, easily assessable through our calculator, as well as factors such as the number of radiators, desired room temperature, openness of the space, presence of underfloor heating, and the intended purpose of the stove, whether it’s meant to serve as the primary heat source or purely for aesthetic effect.
- The amount of insulation in your home (factored in our calculator)
- Determine the number of radiators in the room
- Specify the desired room temperature
- Consider the openness of the space
- Account for the presence of underfloor heating
- Define the stove’s purpose: main heat source or aesthetic effect
These considerations ensure a comprehensive approach to selecting a stove that aligns with your specific heating needs and preferences.
Why is it important to get the kW heat output correct?
Choosing the correct kW heat output for your log burner is crucial to ensure optimal performance and efficiency, preventing the risks of underfiring or overfiring.
Incorrect heat levels can not only diminish the stove’s lifespan but also lead to potential issues such as tar buildup in the chimney, emphasising the importance of selecting the right capacity for your specific room.
What stove should I purchase based on my result?
Choose a category of the leading wood burning stoves based on kW heat output using the links below:
- Small: 3kW+ Wood Burning Stoves
- Average: 5kW+ Wood Burning Stoves
- Large: 8kW+ Wood Burning Stoves
- Extra Large: 11kW+ Wood Burning Stoves
Or view All wood burning stoves
Calculate the kiloWatt power needed to heat your room
Related Article: Choosing the Right Size Log Burner: A Comprehensive Guide
Our stove calculator even provides links to stoves that are genuinely suited to your space. Try it out below, and follow our concise guide to heat output (kW), size and installation for further information.
