firewood heat value comparison charts

Firewood heat value comparison charts are a useful tool for comparing the heat value of various types of firewood. They provide a visual representation of the amount of energy produced by burning a certain type of wood, as well as the efficiency of burning that type of wood. By comparing different types of firewood, it is possible to determine which type is best suited for the particular purpose that it will be used for. Firewood heat value comparison charts can be used to help make informed decisions about which type of firewood to purchase and use.The heat value of firewood is determined by its weight and moisture content. Firewood with a higher heat value will burn hotter and longer than firewood with a lower heat value. The heat value of firewood can be compared by measuring the amount of energy released when it is burned. The higher the energy released, the higher the heat value of the wood. Generally, dry wood has more energy available to produce heat, so it has a higher heat value than wet wood. The density and chemical makeup of the wood also affects its heat value. Hardwoods generally have more energy per unit volume than softwoods and therefore have a higher heat value.

Different Types of Firewood

Firewood is an essential part of home heating and cooking. It is important to understand the different types of firewood available and their uses.

Softwoods, such as pine, spruce, and fir, are the most commonly used firewoods. Softwoods burn quickly, making them ideal for starting fires. They produce a lot of smoke and don’t last long, so they are better suited for short-term use.

Hardwoods such as oak, maple, and hickory are denser than softwoods and tend to burn more slowly. They also produce less smoke and have higher heat output than softwoods. This makes them better for longer-term burning projects such as overnight campfires or cooking fires.

Dry firewood is ideal for burning because it produces less smoke and has a higher heat output than green or wet wood. As the name suggests, dry wood has been stored in a dry place such as indoors or in a shed for at least six months to ensure all moisture has been removed from the wood before it is used for burning.

Seasoned firewood is similar to dry wood but has been aged for at least one year before use. Seasoned wood has had its moisture content reduced even further than dry wood so it will burn hotter and cleaner with less smoke production than green wood or even dry wood.

In addition to these common types of firewood, there are also specialty woods that are ideal for certain applications such as smoking meat or fish. These include mesquite, hickory, applewood, cherrywood, pecan wood, oak chips, and other fruit woods like peach or pear that provide unique flavor profiles when used in smoking meats or fish.

No matter which type of firewood you choose to use in your home heating or cooking needs, make sure you understand the properties of each type so you can get the best results possible from your fires.

Factors that Affect Firewood Heat Value

The heat value of firewood is determined by several factors, including the type of wood, moisture content, and species. Different types of wood have different heat values, which can vary greatly depending on the species and how it was harvested or processed. The moisture content of the firewood also has a major impact on its heat value. The higher the moisture content, the lower the firewood’s heat value. Lastly, different species of trees can have varying levels of heat value due to their chemical composition.

Type of Wood

Hardwoods such as oak, hickory, ash and maple generally have higher heat values than softwoods like pine and cedar because hardwoods are denser and burn hotter than softwoods. Hardwoods also tend to produce less smoke when burning than softwoods. Additionally, woods that were harvested from a standing dead tree will usually produce more heat than wood that was cut from a living tree due to it being less “green” or freshly cut.

Moisture Content

The moisture content of firewood is one of the most important factors in determining its heat value because wetter wood produces less heat when burned. Firewood should always be split and dried for at least six months before being used for burning in order to reduce its moisture content and maximize its efficiency as fuel. Wood with a moisture content below 20% is considered dry enough for use in fireplaces or wood-burning stoves while wood with a moisture content above 25% should not be burned at all because it will produce very little usable heat.


Different species of trees can have varying levels of heat value due to their chemical composition and density. Hardwoods typically have higher heating values than softwoods because they are denser and contain more energy-rich cellulose molecules which burn hotter when combusted. Additionally, some species are naturally more resinous or oily than others which can contribute to their overall heating potential when burned as fuel.

Calculating Firewood Heat Values

Burning firewood for heat is an efficient and cost-effective way to heat your home, but it is important to understand the heat value of different types of wood. Knowing the heat value of firewood will help you decide which type of wood to burn and calculate how much wood you need for heating your home.

The heat value of firewood is measured in British Thermal Units (BTUs). BTUs are a measure of energy, and one BTU is equal to the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit. The higher the BTU rating, the more energy produced when burned. Different species and even different types within a species can vary widely in their BTU ratings. For example, red oak has a BTU rating between 24 million and 28 million per cord, while white oak has a lower rating between 20 million and 22 million per cord.

When calculating the heat value of firewood, it’s important to consider not only the species but also the size, moisture content, and quality. Smaller pieces will have less heat output than larger ones while higher moisture content will decrease efficiency as more energy is used up evaporating moisture rather than producing heat. Poorly seasoned wood such as green wood can have significantly lower BTU ratings than dry wood due to its higher moisture content.

To get an accurate estimate for your firewood’s BTU rating, you can use a combination of factors such as species type, size, moisture content, and quality. You can also consult with local experts or contact your local extension office for more information on calculating firewood Heat Values for different types of wood in your area.

Firewood Heat Value Comparison Charts

Comparing the heat value between different types of firewood is essential for efficient burning. With the right kind of wood, you can get more heat output per firewood volume. Here we will look at the heat value comparison charts for different types of firewood.

The most commonly used firewood is hardwood, such as oak, maple, and hickory. These woods have a higher heat value than softwoods like pine and spruce. Hardwoods can provide up to 30 million British thermal units (BTUs) per cord, while softwoods can provide up to 25 million BTUs per cord.

Cordwood is the most common measurement for firewood and is typically 128 cubic feet in size. The higher the BTU rating, the more efficient a given type of wood will be when burned in a fireplace or wood stove. As such, hardwoods are often recommended over softwoods when selecting firewood for heating purposes.

In addition to hardwoods and softwoods, there are also a number of other types of firewood available on the market today. These include fruit woods such as apple and cherry, as well as other specialty woods like mesquite and pecan. Each type of wood has its own unique characteristics that can affect its heat value.

The best way to determine which type of firewood will provide the most efficient heat output is to consult with an experienced professional who can provide an accurate comparison chart for each type of wood. This chart will list the BTU rating for each type of wood as well as its moisture content and density so that you can make an informed decision when selecting your firewood.


Undefined is a term used in programming that refers to a variable or a constant that has been declared but not defined. This means that the value of the variable or constant is unknown. In most programming languages, an undefined variable will result in an error, alerting the programmer to take action and assign a value to it. In some cases, undefined may be treated as equal to null, meaning it has no value whatsoever.

When a function returns an undefined value, it usually means that the function does not return anything as its output or it does not have anything meaningful to return. This may occur when the function fails for some reason or if the parameters are passed incorrectly. It is important for developers to make sure they handle any undefined values correctly in their code so that their program will run smoothly and without errors.

In JavaScript, it is possible for variables and constants to be declared without assigning any value, which will result in them being assigned an undefined value by default. It is up to the developer to make sure all variables are assigned with meaningful values before they are used in code. If this step is skipped, unexpected errors can occur when trying to access those variables later on in the program.

What is ‘undefined’ in JavaScript?

In the programming language JavaScript, the term ‘undefined’ is used to indicate that a variable has been declared, but not given a value yet. When a variable is declared without being assigned a value, it automatically takes on the value ‘undefined’. It is also possible for an object property to exist and yet have an undefined value.

In JavaScript, undefined is a type of primitive data type. It means something has not been defined, or has been explicitly set to undefined. The typeof operator returns ‘undefined’ when applied to an uninitialized variable or an unknown object property.

When working with JavaScript, there are certain situations where you may want to know if a variable exists or if it has been set to some value. This can be done by checking whether its value is equal to ‘undefined’. If so, this indicates that the variable does not exist or has not been given a value yet.

It is important to note that ‘null’ and ‘undefined’ are two distinct values in JavaScript. While both indicate that something does not exist or is otherwise empty, they have different meanings and implications for code execution. Null indicates that an object does not exist while undefined indicates that a variable has not been assigned any value yet.

In conclusion, understanding what ‘undefined’ means in JavaScript can be essential for effective programming and debugging. Knowing when and how to use the keyword can help you ensure your code runs as expected and avoid unexpected errors in your programs.


Undefined is a type of value in JavaScript. It is used to represent the absence of any value or a variable that has been declared, but not yet assigned a value. It can be returned from functions that do not explicitly return any value. Undefined also serves as the default initialization value for variables that have been declared, but not yet assigned an explicit value.

The primary way to check for undefined values is by using the strict equality operator (===). This operator returns true when both values being compared are undefined, and false otherwise. It is important to note that when using the comparison operator (==), undefined values will return true when compared against other falsy values such as null, false, 0, and empty strings. This can lead to unexpected results and should always be avoided.

It is possible to set an explicit value of undefined on a variable by using the assignment operator (=). This can be useful when writing code that needs to differentiate between uninitialized variables and those with an explicit value of undefined.

Another common use case for undefined is in function parameters. If a parameter is declared, but no argument is passed into the function call then it will have a value of undefined. This can be used to check if certain parameters are provided or not and take appropriate action accordingly.

It is important to remember that undefined does not mean “not defined” or “null”; it simply means that no value has been assigned to the variable yet or it has been explicitly set to undefined using the assignment operator (=). Understanding this distinction will help avoid confusion and unexpected behavior when working with JavaScript variables and functions.


Overall, firewood heat value comparison charts provide an excellent way of determining the best type of firewood to use for specific types of heating applications. They provide a convenient and easy-to-understand way to compare the heat value of different types of wood. This allows users to choose the most effective type for their needs, whether it is for cooking, heating a home or even a commercial application. Firewood heat value comparison charts are an invaluable resource for anyone considering using firewood as a form of fuel.

By taking into account the various factors that can affect the heat value and providing an easy-to-read comparison chart, users can make an informed decision about which type of firewood is best suited to their needs. The heat value comparison charts also provide users with the ability to compare different types of wood without having to do extensive research, making it easier and more efficient when selecting the best type for their application.